TELEDYNE CONTINENTAL ® AIRCRAFT ENGINE

CRITICAL SERVICE BULLETIN

Compliance Necessary To Maintain Safety

 SUBJECT: CRANKSHAFT INSPECTION

1998 ENGINES MODELS AND SERIAL NUMBER:

BACKGROUND: Teledyne Continental Motors (TCM) has become aware of seven (7) crankshaft fractures which have occurred on engines manufactured during 1998. The cause of the fractures has been identified as a discrepancy in the counterweight bushing installation process. The fractures have all occurred on low time engines having new crankshafts installed with total operating time ranging from 85 to 175 hours. All of the fractures have been grouped around certain manufacturing dates. However, TCM has implemented a much wider inspection program that covers crankshafts produced from January, 1998 through December, 1998. Review of the manufacturing processes, basic metallurgy, nitride characteristics, dimensional characteristics and supplier practices have not identified any other contributing causes.

PURPOSE: To provide instructions for the inspection of the number two and five crankshaft cheeks of crankshafts manufactured in 1998.

Inspection is required since undetected cracks can lead to engine failure.

The inspection requires the removal of two cylinders, two connecting rods and four counterweights to facilitate the visual and ultrasonic inspection of specific areas of the number two and five crankshaft cheeks.

All inspections will be performed by TCM representatives. Call TCM at 1-888-200-7565 to schedule inspection of your aircraft engine crankshaft.

COMPLIANCE: For affected engines or crankshafts with 300 hours or less, the inspection must be performed within the next 10 hours of operation.

For affected engines or crankshafts with over 300 hours, the inspection must be performed within the next 50 hours of operation or at the next scheduled maintenance, whichever occurs first.

Uninstalled service spare crankshafts of the affected serial number range must be inspected prior to installation in any engine in accordance with DETAILED INSPECTION, Section C, of the bulletin.

ENGINES

AFFECTED: O-470, IO-470, TSIO-470, IO-520, TSIO-520, LTSIO-520, IO-550, TSIO-550 and TSIOL-550 Series new and rebuilt direct drive engines with crankshafts manufactured from January, 1998 through December, 1998 with serial numbers specified below. Any of the preceding series engines that have had affected new crankshafts installed during field overhaul or repair. See Crankshaft Serial Number Identification page 2 for identification of affected 1998 crankshafts.

 

 

Note: If your engine has recently had a crankshaft installed that may have been manufactured from January through December, 1998 the crankshaft serial number must be verified to determine if this inspection procedure applies.

 

CRANKSHAFT SERIAL NUMBER IDENTIFICATION

 Crankshaft serial numbers incorporate a manufacturing date. Crankshafts produced in 1998 may be identified as follows:

Code:

 

All crankshafts with serial numbers beginning with the letters A through L (Jan. through Dec.) in the first position and the year code 98 in the fourth and fifth position are affected. This serial number is stamped on the propeller flange.

 

 

ENGINE MODEL

ENGINE SERIAL NUMBER

0470GCI1B

817751

0470J11F

202212

0470J18B

202209, 202210

0470K17F

049497, through
049498, 049500, 049502

0470K27B

049501, 049504

0470L10F

069890

0470L16F

069889, 069894, 069895

0470L32B

069884, through 069888, 069891, 069893, 069897

0470L34B

069881, 069882

0470L9F

069896, 069898
   

0470M27B

054155, 054156

0470R15B

815762, 815767, 815770, 815776, 815802, 815814, 815828, 815841, 811962, 811996, 811997

0470R25B

466730, 466731, 811968, 811976, 811994, 815764, 815766, 815768, 815769, 815771, 815775, 815779, 815781, 815782, 815783, 815790, 815792, 815796, 815801, 815813, 815815, 815820, 815817, 815825, 815829, 815837,

0470R25F

811973, 815834, 815787

0470R25M

815812

0470R25U

815756, 815757, 815758, 815780

0470R35B

811986, 811991, 811993, 815760, 815786, 815795, 815797

0470R39B

811989, 815827, 811978

0470R41B

811995, 815816

0470R42B

466729, 811959, 811969, 811970, 811971, 811972, 811974, 811975, 811987, 815765, 815773, 815774, 815793, 815794, 815805, 815806, 815807, 815808, 815819

0470R43B

811988

0470R44B

811958, 811961, 811963, 811981, 811992, 811998, 811999, 815759, 815772, 815784, 815800, 815804, 815809, 815824, 815826

0470R45B

811956, 811983, 811990, 812000, 815753, 815755, 815810

0470R46B

811977, 815763
 


ENGINE MODEL

ENGINE SERIAL NUMBER

0470R52B

811967, 811980

0470R55B

815778

0470R56B

815785, 815818

0470R57B

811964, 811984, 815752

0470R58B

815822

0470R60B

815798

0470R61B

815754, 815791, 815823

0470R65B

815788, 815830, 815835

0470R66B

815811, 815836

0470S1B

269453, 269456, 269461, 269463, 269464, 269472, 269474, 269480, 269485

0470S2B

269454, 269458, 269470, 269473, 269476, 269479, 269487

0470S3B

269452, 269482

0470S6B

269460, 269466, 269465, 269471, 269481, 269484

0470S7B

269450, 269455, 269457, 269459, 269467, 269468, 269469, 269483, 269486

0470S8B

269475

0470S9B

269477, 269478

0470S11B

269462

0470U11B

813331, 813356, 813416

0470U13B

813344, 813358, 813367, 813370, 813372, 813381, 813413, 813334, 813339, 813388, 813420, 813421, 813440

0470U17B

813348, 813353, 813355, 813361, 813377, 813380, 813395, 813396, 813398, 813399, 813400, 813404, 813417, 813425, 813427, 813434, 813437

0470U18B

470756, 470758, 813349, 813364, 813366, 813382, 813383, 813402, 813414, 813422, 813424, 813431, 813439

0470U19B

813410

0470U20B

813335, 813401, 813342

0470U21B

813390, 813435
   

0470U23B

813362

0470U24B

813409, 813438
 




ENGINE MODEL

ENGINE SERIAL NUMBER

0470U25B

813341, 813346, 813352, 813354, 813357, 813378, 813406, 813407, 813412, 813419, 813428, 813429, 813441

0470U26B

813371

0470U27B

813332, 813347, 813373, 813374, 813375, 813397, 813403, 813411, 813423, 813426, 813432

0470U28B

813418, 813433

0470U29B

813365, 813391, 813392

0470U31B

813328

0470U37B

813376, 813442

0470U45B

813360, 813386, 813405, 813415, 813436

I0470C8B

295549, 295550, 295551, 295553

I0470C9B

295552, 295554, 295555

I0470D44B

105643, 105644

I0470D53B

105645

I0470D55B

105642

I0470E17B

088764, 088763, 088766

I0470E19B

088765

I0470E20B

088767

I0470F18B

089920, 089926

I0470F19K

089927

I0470F26B

089916

I0470F27B

089915, 089917, 089918, 089921, 089923, 089924

I0470F29B

089919

I0470F31B

089922

I0470F36B

089925

I0470H6B

087344
   

I0470K3B

092994, 092995

I0470K11B

092991

I0470K17B

092990, 092992, 092999

I0470K18B

092993, 092998

I0470K21B

092989

I0470K22B

092997

I0470L12B

297825

I0470L15B

297845, 297846

I0470L21B

468607, 468608, 468611, 297793, 297794, 297797, 297798, 297800, 297803, 297807, 297812, 297814, 297815, 297818, 297826, 297827,

I0470L21B

297828, 297830, 297832, 297833, 297835, 297836, 297839 through 297843
 


ENGINE MODEL

ENGINE SERIAL NUMBER

I0470L22B

297790, 297796, 297810, 297823, 297824

I0470L23B

297817, 297820, 297834, 297844

I0470L24B

297801, 297802, 297804, 297809 297829, 297831, 297837, 297838, 297847

I0470L25B

297795, 297811, 297816

I0470L26B

297813

I0470L27B

297819

I0470L28B

297791, 297792

I0470L29B

297805

I0470N10K

096711

I0470N11B

096701, 096704, 096707

I0470N13B

096721

I0470N14B

096700, 096703, 096713, 096714, 096715, 096719, 096720

I0470N16B

096705, 096712, 096718, 096722

I0470N17B

096702, 096708, 096716, 096717

I0470N21B

096710

I0470S10B

109384, 109385, 109386, 109388

I0470S14B

109387

I0470U4B

118454

I0470V6B

171198, 171205

I0470V9B

171195, 171196, 171199, 171207

I0470V15B

171204

I0470V16B

171202, 171206

I0520A5B

112825, 112827, 112830, 112840, 112841, 112842, 112845

I0520A14B

112838, 112851

I0520A21B

112828, 112832, 112850

I0520A23B

112821, 112822, 112833, 112839, 112849, 112848

I0520A29B

112836, 112837, 112846

I0520A32B

112834, 112844, 112847

I0520A33B

112823, 112831, 112843

I0520A37B

112826

I0520A38B

112829

I0520B6B

234783, 234784, 234785

I0520BA2B

814286, 814288, 814289, 814292, 814305, 814306, 814311, 814316, 814318, 814320, 814321, 814332, 814344, 814349, 814350, 814358
 







ENGINE MODEL

ENGINE SERIAL NUMBER

I0520BA6B

814301, 814312, 814338, 814356

I0520BA10B

814280, 814283, 814291, 814296, 814299, 814304, 814307, 814309, 814314, 814317, 814323, through, 814326, 814328, 814330, 814343, 814345, 814346, 814351, 814353, 814354, 814357, 814360, 814362

I0520BA11B

814302

I0520BA12B

814279, 814297, 814298, 814313, 814300, 814322, 814331, 814333, 814335, 814342, 814359, 814361, 814364, 814366, 814368

I0520BA14B

814336, 814337, 814341

I0520BA14M

814319

I0520BA23B

814303, 814329

I0520BA26B

814365

I0520BA32B

814315

I0520BA37B

814294, 814339, 814347, 814355

I0520BA38B

814293, 814295, 814327, 814348, 814352, 814363

I0520BB3B

813856, 813859, 813893

I0520BB6B

813826, 813840, 813891, 813896, 813900, 813906

I0520BB10B

813849, 813852, 813857, 813870, 813871, 813875, 813879, 813886, 813890, 813892, 813899, 813902, 813908, 813913

I0520BB12B

813829, 813838, 813845, 813846, 813855, 813858, 813862, 813869, 813877

I0520BB14B

813839, 813847, 813865, 813876

I0520BB15B

813832, 813837, 813873, 813889, 813894, 813897, 813914, 813915

I0520BB16B

813888, 813898, 813907, 813912

I0520BB16U

813831, 813841

I0520BB18B

813844, 813878

I0520BB18U

813860

I0520BB19B

813848, 813866, 813904

I0520BB21B

813835, 813910

I0520BB23B

813836, 813867

I0520BB29B

813853, 813863

I0520BB31B

813843, 813861, 813864, 813884, 813903

I0520BB37B

813854, 813905, 813921

I0520BB52B

813833, 813874, 813895

I0520BB54B

813885

I0520BB56B

813909
 


ENGINE MODEL

ENGINE SERIAL NUMBER

I0520BB58B

813911, 813920

I0520BB61B

813842, 813872, 813882, 813883, 813901, 813919

I0520C3B

810968, 810977, 810979, 810980, 810992

I0520C7B

810949, 810961, 810962, 810964, through 810967, 810970, 810972, 810973, 810974, 810976, 810978, 810986, 810987, 810988, 810990, 810995, 810996, 810997, 816754, 816755, 816756, 816761, 816762, 816763, 816765, 816768, through 816777, 816780, through 816784, 816786, through 816789

I0520C10B

810958, 810959, 810960, 810969, 810971, 810981, 810982, 816752, 816753, 816759, 816764, 816766, 816778

I0520C13B

816785

I0520C15B

810963, 810984, 810985, 810989, 810991, 810993, 810994, 810998, 816767

I0520C16B

816760, 810954, 810983, 810999

I0520CB3B

298983, 299044, 299045, 299061, 299066, 576321

I0520CB7B

298965, 298966, 298968, 298971, 298977, 298979, 298985, 298986, 298987, 298990, 298993, 298996, 299007, 299008, 299015, 299016, 299017, 299025, 299030, 299031, 299033, 299034, 299040, 299043, 299046, 299048, 299052, 299057, 299058, 299062, 299071, 299072, 299073, 299076, 299079, 299085, 299086, 299088, 299092

I0520CB8B

298997, 298998, 299009, 299010, 299014, 299077, 299083

I0520CB8F

299020, 299023, 299029, 299039

I0520CB8W

298984, 299000, 299001, 299005, 299006, 299049

I0520CB9F

298972 298973 299012 299013 299019 299021 299022 299054 299055 299056 299063 299068 299069 299070

I0520CB12B

299011

I0520CB17B

298995, 299027, 299028

I0520CB19B

299059, 299060
 



ENGINE MODEL

ENGINE SERIAL NUMBER

I0520CB21B

298969, 298970, 298976

I0520CB22B

298991, 298992, 299018, 299074

I0520CB40B

298974, 298981, 298982, 298988, 298989, 299003, 299004, 299035, 299036, 299037, 299038, 299041, 299042, 299050, 299051, 299067, 299080, 299081,

I0520CB41B

298978, 298999, 299026, 299032, 299047, 299064, 299075, 299078

I0520D10B

816511, 816525, 816543

I0520D22B

812945, 812987, 816532

I0520D23B

812918 812962 812963 812980 812996 816508 816515 816522 816527 816533 816547 816554

I0520D24B

812991, 812940, 816564

I0520D24M

816502

I0520D24N

812954

I0520D26B

575935 812947 812961 816503 816524 816536 816550

I0520D27B

812977, 816526

I0520D29B

812924

I0520D30B

816510, 816518, 816531, 816544

I0520D31B

812992

I0520D32B

812968, 816506, 816507

I0520D35B

575934

I0520D39B

812966

I0520D40B

812919, 812943, 812979, 816512, 816545

I0520D44B

575938, 812934, 816546

I0520D45B

816560

I0520D48B

812917

I0520D51B

812933, 812939, 812958, 812981

I0520D56B

812927, 812929, 812944, 812948, 812949, 812952, 812957, 812959, 812990, 816523, 816529, 816553, 816555, 816557, 816563

I0520D70B

816513

I0520D75B

812928

I0520D79B

816539

I0520D7B

812997, 812998, 812999

I0520D84B

816530, 816534

I0520D90B

812937

I0520D91B

812989

I0520D95B

816517, 816559

I0520D96B

816501

I0520D9B

812922, 812931, 812973, 816548
 



ENGINE MODEL

ENGINE SERIAL NUMBER

I0520D100B

816516

I0520D113B

816561

I0520D116B

812930, 812938, 812941, 812950, 812951, 812969, 812975, 812976, 816505, 816514, 816520, 816537, 816540, 816558, 816565

I0520D117B

812956

I0520D119B

816538, 812993

I0520D120B

812982, 812984, 816567

I0520D124B

812960, 812985, 812986, 812988, 813000, 816521, 816535, 816549

I0520D139B

812942, 812946, 812983, 816519, 816528, 816541, 816542, 816556

I0520D142B

812994, 816509, 816552

I0520D149B

812955

I0520D152B

816504, 816551

I0520D173B

812935, 816566

I0520D177B

812932, 812972

I0520E2B

215906, 215918, 215919, 215921, 215922

I0520E7B

215914, 215915, 215916, 215917

I0520E9B

215920

I0520E11B

215904, 215905

I0520E14B

215908, through 215913

I0520F3B

814787, 814795, 814806, 814817, 814851, 814856, 814858, 814882, 814898, 814905, 814952

I0520F4B

814836, 814825, 814826, 814925,

I0520F6B

814852

I0520F7B

579256, 814837, 814946, 814949

I0520F9B

814783, 814810, 814820, 814832, 814835, 814838, 814839, 814894, 814916

I0520F12B

579247, 579248, 579250, 579257, 814814, 814815, 814848, 814850, 814876, 814903, 814907, 814919, 814937, 814961

I0520F13B

579251, 579253, 814770, 814777, 814788, 814831, 814877, 814880, 814885, 814890

I0520F13U

814791

I0520F16B

814822, 814857, 814899, 814910, 814926, 814938

I0520F17B

814768, 814775, 814865, 814883, 814884, 814906, 814950, 814956

I0520F18B

814873
 



ENGINE MODEL

ENGINE SERIAL NUMBER

I0520F20B

814887, 814936

I0520F21B

814803, 814935

I0520F22B

814844, 814902

I0520F23B

814913, 814914

I0520F24B

814891 814785 814790 814801 814802 814823 814862 814863 814867

I0520F26B

579254, 579255, 814849, 814872, 814924

I0520F27B

814765, 814766, 814767, 814794, 814811, 814812, 814818, 814819, 814833, 814855, 814861, 814871, 814875, 814911, 814933, 814934, 814940, 814942, 814948, 814954

I0520F39B

814878, 814799

I0520F42B

814792, 814816, 814824, 814827, 814868, 814879, 814889

I0520F43B

814840, 814853, 814859

I0520F46B

814796

I0520F47B

814784

I0520F48B

814771, 814778, 814779, 814781, 814782, 814786, 814797, 814800, 814828, 814830, 814834, 814854, 814908, 814912, 814923, 814929, 814939, 814941

I0520F56B

814789, 814793, 814843, 814845, 814846, 814886, 814944, 814945

I0520F57B

814776, 814805, 814847, 814864, 814869, 814874, 814909, 814920, 814921, 814943

I0520F59B

814813, 814915

I0520F60B

814808

I0520F61B

814893, 814897, 814900

I0520F64B

814780, 814807, 814821

I0520F67B

579252

I0520F68B

814804, 814896

I0520F69B

814842

I0520F70B

814947

I0520J1B

216532, 216533, 216536, 216537

I0520J2B

216535

I0520K1B

224133 through 224136

I0520L1B

294874, 294902, 294905, 294913

I0520L5B

294919

I0520L7B

294878, 294885, 294887, 294888, 294889, 294899, 294909, 294912, 294914, 294918, 294935, 294940, 294943, 294954
 


ENGINE MODEL

ENGINE SERIAL NUMBER
   

I0520L8B

294880, 294883, 294884, 294886, 294921, 294930, 294936, 294937, 294938, 294950

I0520L12B

294906, 294932

I0520L13B

294894, 294907, 294910, 294939

I0520L14B

294893, 294917, 294931

I0520L16B

294879, 577231

I0520L17B

294882, 294904, 294933

I0520L18B

294945

I0520L19B

294908

I0520L1B

294941

I0520L32B

294920

I0520L46B

294890, 294897, 294923, 294944, 294951, 294953

I0520L47B

294911, 294922

I0520L48B

294875, 294881, 294895, 294901

I0520L51B

294891, 294892, 294896, 294898, 294903, 294915, 294924, 294925, 294926, 294927, 294928, 294929, 294934, 294947

I0520L53B

294952

I0520L54B

294946

I0520M1B

811590, 811892 through 811600, 811602 through 811612, 811614 through 811630

I0520M2B

811601, 811613

I0520MB1B

277683, 277685, 277688, through 277701, 277703 through 277717, 277719, 277721, 277723, through 277728

I0520MB2B

277684, 277686, 277687, 277718

I0550A2B

280478, 280479, 817005

I0550A3B

280475 through 280477, 280480 through 280483, 280485, 280486, 280488 through 280493, 280496 through 280500, 817001, 817002, 817003

I0550A5B

280494, 280495, 280487, 817004

I0550B1F

297048, 297050, 297074, 297115

I0550B4F

297039, 297059, 297101, 297105, 297108, 297118

I0550B5F

297037,

I0550B6F

297040, 297041, 297042, 297043, 297057, 297064, 297066, 297069, 297070, 297071, 297072, 297077, 297078, 297083, 297084, 297085,

 


ENGINE MODEL

ENGINE SERIAL NUMBER

I0550B6F

297086, 297087, 297091, 297095, 297116, 297117, 297143, 683996, 684001, 684110

I0550B9F

297047, 297102

I0550B12B

297046, 297051, 297052, 297055, 297056, 297058, 297060, 297062, 297063, 297073, 297079, 297081, 297082, 297088, 297089, 297090, 297094, 297096, 297097, 297103, 297104, 297113, 297114, 297119, 297120, 297121, 297124, 297125

I0550B13B

297049, 297068, 297080, 297093, 297098, 297109, 297110, 297122, 297123

I0550B14B

297076

I0550B15B

684014

I0550B22B

297044

I0550B23B

297092, 297107

I0550B37B

682983 through 682990, 682993, 682995 through 683003, 683005, 683008 through 683011, 683013, 683015, 683016, 683017, 683019, 683020, 683023, 683025 through 683033, 683941, 683942, 683944, 683995, 683997, 683998, 683999, 684000, 684002

I0550B39B

684004 through 684013, 684015 through 684022, 684745

I0550B40B

297106

I0550C1F

810500, 815251, 815252, 815255 through 815258, 815261, 815272, 815277, 815278, 815279, 815282, 815286, 815313

I0550C2F

815280, 815281, 815318

I0550C3F

810479 through 810483, 815289 through 815294, 815301, 815302

I0550C6F

684222, 684223, 684232, 684233, 684370, 684371, 810489, 810490, 810494, 810495, 810496, 810497, 810499, 815253, 815254, 815259, 815262, 815263, 815264, 815265, 815266, 815270, 815271, 815273, 815275, 815276, 815283, 815284, 815298, 815299, 815305, 815306, 815307, 815308, 815309, 815310

I0550C8B

815285, 815287, 815288, 815311

I0550C9B

815269, 815304
 



ENGINE MODEL

ENGINE SERIAL NUMBER

I0550C11B

815268

I0550C30B

683723 through 683741, 683744 through 683767, 683887 through 683891, 684159 through 684166, 684168 through 684175, 684368, 684369

I0550C31B

684234, 684235, 684237 through 684241, 684243 through 684253, 684255 through 684265, 684534

I0550D2B

284287, 284291

I0550D9B

284282

I0550D10B

284296

I0550D13B

284279, 284284, 284285, 284288, 284293, 284307, 680017

I0550D14B

284280, 284289

I0550D15B

284277, 284278, 284281, 284290

I0550D16B

284276, 284286, 284298

I0550D17B

284300

I0550D1B

284283, 284306

I0550D20B

284292, 284294, 284295, 284299, 284301, 284302

I0550D22B

284297

I0550E1B

283382, through 283389

I0550F1B

284870, 284882

I0550F2B

284845

I0550F3B

284847, 284846, 284865, 284875, 284889

I0550F4B

284879

I0550F6B

284857

I0550F7B

284874

I0550F8B

284897

I0550F9B

284839, 284841, 284842, 284850, 284854, 284855, 284860, 284869, 284876, 284887, 284891

I0550F10B

284866, 284872, 284878, 284894

I0550F11B

284849, 284871

I0550F13B

284843, 284862, 284880, 284892, 284895

I0550F14B

284844, 284861, 284864, 284893

I0550F15B

284848

I0550F16B

284885

I0550F17B

679521

I0550F19B

284886

I0550F20B

284856, 284863, 284881, 284883, 284896
 




ENGINE MODEL

ENGINE SERIAL NUMBER

I0550F21B

284859, 284873, 284888, 284890

I0550F24B

284851

I0550G1B

679341

I0550G2B

679340, 679373

I0550G6B

679316 through 679319, 679323 through 679325, 679328 through 679337, 679343, 679346 through 679353, 679363 through 679372, 679377, 679381, 679393, 808508

I0550L1B

289142

I0550L3B

289136

I0550L6B

289140, 289145

I0550L7B

289134, 289141

I0550L11B

289127, 289130, 289131, 289133, 289137, 289138, 289139, 289143, 289144

I0550L15B

289135

I0550N1B

683355

I0550N2B

683354

LTSI0520AE2B

246667, 246668

LTSI0520AE3B

246666, 246669, 246670, 246671, 246672, 246673

LTSI0520AE4B

246662

LTSI0520AE5B

246663

TSI0520AE2B

246166

TSI0520AE3B

246160, 246165, 246168, 246169, 246171

TSI0520AE4B

246170

TSI0520AE5B

246161, 246163

TSI0520AF3B

245244, 245246 through 245251

TSI0520B5B

176754

TSI0520B9B

176751, 176755, 176756, 176757, 176758, 176762, 176763

TSI0520B10B

176750, 176752, 176761

TSI0520B11B

176753, 176759

TSI0520B12B

176760

TSI0520BB9B

287592, 287598, 287600, 287607, 287611

TSI0520BB10B

287591, 287597, 287599, 287602, 287605, 287608

TSI0520BB17B

287593

TSI0520BB18B

287594

TSI0520BB21B

287595, 287606

TSI0520BB22B

287596

TSI0520BB23B

287610

TSI0520BB24B

287609

TSI0520BE2F

273809
 


ENGINE MODEL

ENGINE SERIAL NUMBER

TSI0520BE2G

273810, 273813, 273814, 273815, 273816

TSI0520C2B

178534, 178543, 178545

TSI0520C3B

178541, 178546, 178549

TSI0520C5B

178542, 178553

TSI0520C6B

178552

TSI0520C7B

178528, 178530, 178535, 178538, 178539, 178551

TSI0520C8B

178540, 178544

TSI0520C9B

178536, 178547, 178550

TSI0520C11B

178548

TSI0520CE1F

268576, 530168

TSI0520CE2B

268575

TSI0520D3B

180109, 180110

TSI0520DB1B

242015

TSI0520E4B

812578, 812587, 812603, 812606

TSI0520E5B

812593, 812602, 812607, 812618

TSI0520E8B

812575, 812579, 812586, 812589, 812591, 812596, 812598, 812600, 812601, 812612, 812615, 812617, 812619

TSI0520E9B

812569 812574 812576 812577 812581 through 812585 812590 812592 812594 812597 812599 812608 812609 812611 812613 812614 812616

TSI0520E14B

812580

TSI0520E17B

812610

TSI0520E19B

812571

TSI0520E23B

812588

TSI0520EB2B

271498

TSI0520EB4B

815005

TSI0520EB5B

815004, 815006

TSI0520EB8B

271499, 815001, 815010, 815011, 815012, 815015, 815020, 815021, 815024, 815025, 815028, 815030, 815031

TSI0520EB9B

271496, 271497, 815007, 815009, 815013, 815014, 815016, 815017, 815018, 815019, 815022, 815026, 815027, 815029, 815032

TSI0520EB17B

815023

TSI0520G1B

216051

TSI0520G3B

216052, 216053

TSI0520H1B

217410

TSI0520H4B

217402, 217404, through 217409, 217411, through 217414, 217416
 


ENGINE MODEL

ENGINE SERIAL NUMBER

TSI0520H6B

217401, 217403, 217415, 506894

TSI0520J1B

218988, 218990, 218991

TSI0520J2B

218989

TSI0520JB1B

237189, 237186, 237191

TSI0520JB2B

237187, 237188, 237190

TSI0520KB1B

245711

TSI0520KB2B

245712

TSI0520L1B

241970, 241971, 241972

TSI0520L4B

241969

TSI0520LB1B

237300

TSI0520LB4B

815502, 815503

TSI0520LB6B

237299, 815501

TSI0520M6B

291944, 291957, 291962, 291996

TSI0520M7B

291929 through 291929, 291931, 291934, 291938 through 291939, 291943, 291945, 291946, 291948, 291949, 291952 through 291956, 291958, 291959, 291960, 291963, 291964, 291965, 291970, 291971, 291973, 291976, 291979, 291980, 291981, 291982, 291985, through 291989, 291991, 291992, 291994, 291995, 291998, 291999, 292000, 532083 532085 532086, 532087, 532088,

TSI0520M8B

291961, 291984

TSI0520M9B

291932, 291967, 291968

TSI0520M10B

291937, 291947, 291975, 291977, 291978, 291983, 291990, 291993, 291997, 818001

TSI0520M11B

291969

TSI0520N1B

228639

TSI0520NB1B

521665, 813564, 813568, 813571, 813575, 813582, 813588, 813589, 813592, 813600, 813608, 813614, 813617, 813618, 813621, 813628

TSI0520NB2B

521666, 813565, 813572, 813573, 813576, 813585, 813601, 813615, 813619, 813622, 813623

TSI0520NB4B

813603, 813606, 813616, 813629, 813632

TSI0520NB5B

813578, 813594, 813607, 813610, 813611

TSI0520NB6B

813569, 813613, 813624

TSI0520NB8B

813583, 813605, 813620, 813631

TSI0520NB10B

813579, 813598, 813612

TSI0520NB12B

813595
 


ENGINE MODEL

ENGINE SERIAL NUMBER

TSI0520NB13B

813597

TSI0520NB14B

813626

TSI0520NB16B

813577

TSI0520NB17B

813566, 813567, 813581, 813584, 813630

TSI0520NB31B

813602

TSI0520NB32B

813599

TSI0520P5B

278818, 278825

TSI0520P6B

278812, 278815, 278816, 278819, 278820, 278823, 278826

TSI0520P7B

278810, 278813, 278824, 278828

TSI0520P8B

278814, 278817, 278821

TSI0520R7B

293992, 294016, 294025

TSI0520R9B

293950, 293955, 293956, 293959, 293961, 293964, 293965, 293969, 293970, 293972, 293975, 293976, 293977, 293979, 293984, 293985, 293987, 293991, 293993, 293994, 293995, 293997, 293998, 293999, 294004, 294007, 294008, 294011, 294014, 294018, 294022, 294023, 294024, 294026, 294027, 294029, 294031, 294032, 294036, through 294039, 522696, 522697, 522698, 522699, 522700

TSI0520R10B

293958, 294005, 294035

TSI0520R11B

293978, 294000, 294019

TSI0520R12B

293957, 293960, 293962, 293963, 293967, 293973, 293974, 293982, 293986,

TSI0520R12B

293990, 294001, 294003, 294006, 294010, 294013, 294015,294021, 294030, 294034

TSI0520R13B

293983

TSI0520T1B

239460 through 239462, 239464 through 239471, 515439 through 515442

TSI0520T3B

239463, 239472

TSI0520UB1B

809335, 809340

TSI0520UB2F

809327, 809331, 809333, 809339

TSI0520UB3F

527447, 809334, 809341, 809345, 809346

TSI0520UB4F

809347

TSI0520UB5F

809350

TSI0520UB6B

809328, 809329, 809332, 809336, 809337, 809344, 809349
 



ENGINE MODEL

ENGINE SERIAL NUMBER

TSI0520UB8B

809348

TSI0520UB11B

809338

TSI0520UB12B

809342

TSI0520UB16B

527365, 527366, 527367, 527369, 527370, 527372, 527373, 527374, 527393, 527408, 527412, through

527418

TSI0520UB17B

527420 through 527426

TSI0520VB1B

529113, 811197, through 811201, 811205, 811208, 811209, 811213, 811228, 811229, 811232, 811242, 811247, 811248, 811249, 816001, 816005, 816008, 816010, 816011, 816014, 816016, 816017, 816018, 816020, 816025, 816027, 816033

TSI0520VB2B

529112, 811202, 811206, 811236, 811238, 811244, 811250, 816007, 816030, 816031, 816032

TSI0520VB2F

811196, 811204, 811214, 811231, 811235, 816006, 816019, 816024, 816028, 816036, 816040

TSI0520VB4B

811194, 811237, 816012, 816026, 816039, 816041

ENGINE MODEL

ENGINE SERIAL NUMBER

TSI0520VB4F

811195, 811207, 811210, 811211, 811212, 811217, 811218, 811220, through 811227, 811230, 811233, 811234, 811239, 811240, 811241, 811243, 811245, 816002, 816003, 816004, 816009, 816013, 816021, 816022, 816034, 816035, 816037, 816038, 816044

TSI0520WB3F

274416 through 274427, 274430, through 274436, 274439

TSI0520WB5F

274428, 274429

TSI0550C1B

802576 through 802590, 814502, 814503, 814504, 814506 through 814509

TSI0550E1B

803057, 803059, 803061, 803062, 803065, 803067, 803069, 803070, 803079, 803080,

   

TSI0550E3B

803056, 803066, 803068

TSI0L550A1G

809259

TSI0L550C1B

803251, 803253

1999 ENGINE MODELS AND SERIAL NUMBER:
with 1998 manufactured crankshafts

ENGINE
MODEL

ENGINE SERIAL NUMBER

0470R15B

815843

0470R25B

815839, 815846, 815860

0470R25F

815838

0470R25U

815840

0470R44B

815842, 815844

0470R55B

815845

0470S2K

269489

0470U18B

813444, 813445

0470U25B

813448

I0470C8B

295556

I0470F27B

089928

I0470K18B

093000

I0470L15B

297856, 297857

I0470L21B

297848, 297850, 297851, 297852

I0470L23B

297854

I0470N11B

096727

I0470N14B

096724, 096726

I0470N20B

096725

I0470V15B

171208
 


ENGINE
MODEL

ENGINE SERIAL NUMBER

I0520BA10B

814374, 814373, 814369

I0520BA22B

814372

I0520BA23B

814370, 814371

I0520BB15B

813918

I0520C15B

816791, 816799

I0520C7B

816792

I0520CB3B

299112

I0520CB7B

299091, 299096, 299097

I0520CB8B

299090

I0520CB8W

299093, 299094

I0520D13B

816570

I0520D142B

816569

I0520D56B

816572

I0520F21B

814960

I0520F47B

814959

I0520F64B

814957

I0520F70B

818766

I0520L27B

294955

I0520L7B

294956
 


ENGINE
MODEL

ENGINE SERIAL NUMBER

I0520MB1B

277730

I0550B13B

297133, 297134, 297136, 297137, 297138, 297153

I0550B15B

684113

I0550B39B

684023, 684024, 684025

I0550B4F

297131

I0550B5F

297130

I0550B6F

297128, 297129

I0550C2F

815316

I0550C31B

684266, 684267, 684268, 684273

I0550C6F

815314, 815315

I0550C8B

815319

I0550D13B

680019

I0550D14B

680018

I0550D15B

284311

I0550D18B

284312

I0550F5B

284898

I0550G6B

679378, 679382

I0550L3B

289147

LTSI0520AE2B

246675, 524343

TSI0520AE2B

523349

TSI0520BB10B

287616

TSI0520E19B

812621

TSI0520E4B

812622

TSI0520E5B

812623

TSI0520E8B

812630

TSI0520E9B

812620, 812626

TSI0520EB8B

815033

TSI0520M6B

818002, 818011

TSI0520M7B

818003, 818005, 818013

TSI0520NB9B

813634

TSI0520P6B

278830

TSI0520R10B

294044

TSI0520R11B

294043

TSI0520R12B

294050

TSI0520R9B

294046

TSI0520UB17B

527427

TSI0520UB1B

809352

TSI0520VB1B

816046

TSI0520VB2F

816047

TSI0520VB4B

816045

TSI0550C1B

802591

TSI0550E1B

803077

GENERAL INFORMATION:

INSPECTION OF NEW AND REBUILT AFFECTED ENGINES AND ENGINES THAT HAVE BEEN OVERHAULED OR REPAIRED UTILIZING THE SERIAL NUMBERED CRANKSHAFTS SPECIFIED IN THIS CRITICAL SERVICE BULLETIN.

The inspection required by this service bulletin is intended to detect conditions which if present and left uncorrected can result in engine failure.

PRE-INSPECTION:

 1. a. Turn the master switch off.

b. Turn magneto switches off.

c. Close the throttle.

d. Place mixture control in the idle cutoff position.

  1. To gain access to the engine remove the engine cowling in accordance with the aircraft manufacturer's maintenance manual.

  2. Disconnect all spark plug leads from spark plugs to prevent engine firing.

  3. Remove engine baffling and engine mounted equipment, as required, to facilitate removal of cylinders number one and three.

  4. Remove cylinders number one and three in accordance with the applicable engine maintenance manual, overhaul manual or aircraft manufacturer's maintenance manual. Remove the cylinder only far enough to expose the piston pin. Push the piston pin out of the connecting rod bushing only far enough to release the piston and piston pin from the connecting rod, leaving the piston in the cylinder.

  5. The numbers one and three connecting rods and all counterweights will have to be removed to perform the inspection.

Note: Place a clean shop towel through the cylinder opening below the crankshaft to catch any items that may be dropped.

 


Anything dropped in the engine must be removed.

  1. Position the connecting rod to be removed (number one or number three) at or near top center. See Figure 1.

    2. Note: The 470, 520 and 550 series engines may have connecting rod nuts secured with cotter pins or they may have Spiralock nuts which do not have cotter pins. When removing Spiralock nuts, you may find it necessary to tighten the nut slightly to release the self-locking feature.

  2. Remove, if utilized, the connecting rod nut cotter pins and discard them. Remove the connecting rod nuts.

  3. Carefully separate the connecting rod from the connecting rod cap. Support the connecting rod cap while removing the connecting rod from the crankshaft. Repeat this procedure for the other connecting rod.

  4. Position the crankshaft so that the rearward retaining rings and plates of a counterweight on the number two crankshaft cheek can be removed. Using a pair of snap ring pliers, remove and discard two retaining rings. Using a long, blunted tip awl and ball peen hammer tap the retaining plates to loosen them. Remove retaining plates with a pair of 90° offset snap ring pliers, a scribe with a hook fashioned into its end or a retrieval magnet. See Figure 2. Discard the retaining plates. Using a retrieval magnet, remove the counterweight pins. See Figure 3. Document the pin positions. They must be placed back in the same position from which they were removed.

    5. Counterweight and counterweight blade positions are identified as leading or trailing based on the position of the number one connecting rod journal. With the number one connecting rod journal at the 6 o’clock position (as viewed from the rear of the engine), the number two crankshaft cheek counterweight and blade at the 3 o’clock position and the number 5 crankshaft cheek counterweight and blade at the 2 o’clock position are identified as the trailing

     

    counterweight and blade. The opposite counterweight and blade are identified as the leading counterweight and blade. When removing counterweights and counterweight pins identify the counterweights as leading or trailing and the counterweight pins leading (first pin in the direction of engine rotation) or trailing (second pin in the direction of engine rotation). Again, the counterweights and counterweight pins must be reinstalled in same location from which they were removed.

  5. Looking from the rear of the engine forward, turn the crankshaft in the counterclockwise direction far enough that the lower end of the counterweight can be started out through the cylinder opening by hand. See Figure 4. Now turn the crankshaft in the clockwise direction and remove the counterweight. See Figures 4, 5, 6 and 7.

  6. Using the procedure in steps 10 and 11 remove the remaining counterweight on the number two crankshaft cheek and remove the two counterweights on the number five crankcheek.

  7. Some counterweights may not clear the crankcase and cannot be removed. If so, position as shown in Figure 8 for the inspection.

CAUTION

Be careful when turning crankshaft with a loose counterweight.

Note: Document positions of counterweights so they are returned to the original positions.

DETAILED INSPECTION:

  1. VISUAL INSPECTION:

  1. Using a soft shop towel dampened with solvent, remove any surface residue from the aft side of the number two and five crankshaft cheeks. The outboard area at the edge of crankshaft cheek next to the counterweight is the area to be inspected. See Figures 9, 10 and 11.

  3. Using a flashlight and mirror or a borescope visually inspect the aft side of the number two and five crankshaft cheek for indications of a crack or mechanical damage. The inspection area is between the counterweight blade bushing holes at the chamfered edge of blade shoulder on both sides of the crankshaft cheek. See Figure 10 and Figure 11.

  1. If a crack or crack indication is noted verify with the ultrasonic inspection.

  1. If the visual inspection does not reveal any cracks perform an ultrasonic inspection of the aft side of number two and five crankshaft cheek in accordance with Section "B" ULTRASONIC INSPECTION.

  1. ULTRASONIC INSPECTION:

An ultrasonic inspection must be performed in accordance with TCM procedure MHS 244.

This procedure must be done with the equipment and trained personnel as indicated in MHS 244. Deviations from this procedure must be approved in writing from TCM.

If a crack or a crack indication is detected during this inspection, the engine must be removed from service until repaired or replaced.

C. SERVICE SPARE CRANKSHAFTS:

  1. Uninstalled service spare crankshafts must have the visual and ultrasonic inspections performed in accordance with sections A and B. Additionally, perform a magnaflux inspection in accordance with ASTM E 1444. The wet continuous method utilizing full wave rectified alternating current and fluorescent particles is required.

  3. Crankshafts meeting the inspection criteria in "C" part 1 must be identified by vibropeening 99-3 after the crankshaft serial number i.e. AXX98XXN 99-3.

RETURN TO SERVICE:

  1. Ensure that no debris is left in the engine interior.

    2. WARNING

     Failure to remove all debris from the engine interior can result in engine damage and possible failure.

  2. Drain the engine oil into an approved container.

  3. Install the counterweights and pins in the exact locations from which they were removed in accordance with the following:

Note: The counterweight plates have a small extruded point which provides an interference fit of .001 to .007. Before installation, check the counterweight plates for an actual interference fit in the bushing bore. An interference fit is required.

  1. Install the two counterweights removed from the number two crankshaft cheek hanger blades in their original position and install the counterweight pins in their original position. Install new plates and retaining rings with sharp edge outboard. If new pins are installed, pins with the same part number and dash number must be installed in each counterweight. Repeat the above process for the counterweights on the number five crankshaft cheek.

    2. CAUTION

     The retaining rings, plates and pins must be installed as shown in Figure 12. "Counterweight Inspection, and Installation."

    Do not use plates that have a loose fit. Failure to properly install counterweight retaining plates and snap rings may result in engine damage and possible failure.
  2. Apply 50-weight Aviation grade oil to the number one and three crankshaft connecting rod journals.

  1. Position the number one and three connecting rod caps with bearing insert and bolts installed (position number facing up) on the respective crankshaft connecting rod journals.

  2. Install the number one and three connecting rods, with bearing insert in place, on the respective crankshaft connecting rod journal while supporting the connecting rod cap and bolts.

  3. Lubricate the threads of the connecting rod bolts and nuts with clean 50-weight aviation grade oil and thread the nuts onto the bolts.

NOTE: Spiralock nuts are self locking fasteners and thread freely onto the connecting rod bolt.

  1. Torque connecting rod nuts to the torque value specified in Table 1 as follows.

    2. For connecting rods using either P/N 643215 or P/N 654490 self-locking connecting rod nut (Spiralock nut), torque to the value specified in Table 1. See Figure 13.

    For connecting rods using P/N 628109 castellated nuts and P/N629340 bolt, initially torque nut to the specified low limit in Table 1 or TCM Service Bulletin SB96-7B. If the cotter pin hole in the bolt and the castellations of the nut do not align, set the torque wrench to the specified maximum torque limit and continue to torque the nut until the castellations align or the specified maximum torque limit is reached. If the specified maximum torque limit is reached before the castellations align with the cotter pin hole in the bolt, the nut will have to be removed and a new nut installed and torqued as specified above.

  2. Install new cotter pin in each nut and secure by seating the cotter pin head in nut castellations and bending one leg of the cotter pin up over the con-rod bolt and back toward the head of the cotter pin. Trim leg so that its end is centered with the center of the bolt diameter. Bend the other leg down and trim it so that its end is mid way between the nut base and the nut castellation. See Figure 14.

  4. Prior to installing number one and three cylinders, ensure that the engine interior is free of any debris and tools.

  5. Install a new cylinder base "O" ring on each cylinder.

  1. Lubricate the exposed portion of the piston and piston pin on each cylinder with clean 50-weight aviation oil.

  2. With the aid of an assistant, install number one and three cylinders in accordance with the TCM Maintenance Manual, Overhaul Manual and Service Bulletins.

  3. Lubricate all cylinder deck stud threads, through bolt threads and nuts with clean 50 weight engine oil prior to installation and torquing.

  4. Torque cylinder deck stud nuts and through bolt nuts to the value specified in Table 2.

CAUTION

 Proper cylinder installation requires a multiple step torquing process. Cylinder base stud threads, through bolt threads and nuts must be lubricated with clean 50-weight aviation oil.

  1. Torque cylinder base nuts to 1/2 of the specified torque value for the fastener.

  2. Torque the cylinder through bolt nuts and cylinder base stud nuts to the specified torque value for the cylinder base stud nuts. Through bolt nuts must be torqued on both sides of the engine.

    3.  

    Failure to torque through bolt nuts on both sides of the engine can result in a loss of main bearing crush, main bearing shift and engine failure.

  3. Torque through bolt nuts on both sides of the engine to the specified value for the fastener.

  4. On engines which incorporate the 7th cylinder deck stud, lubricate threads and install the 7th stud cylinder bracket and conical stud nut. Torque the stud nut to the value specified for the fastener.

NOTE: Through bolt nuts P/N’s 634505 and 649496 have been superseded by nut P/N 652541.

Nut P/N 634505 is a flanged 6 point (hex) nut requiring a torque value of 690-710 inch pounds. Nut P/N 649496 is a flanged 6 point (hex) nut requiring a torque value of 790-810. Nut P/N 652541 is a flanged 12-point nut requiring a torque value of 790-810 inch lbs. At engine overhaul all P/N 634505 and 649496 flanged through bolt nuts must be replaced with P/N 652541 flanged 12 point nuts. If replacing P/N 634505 or 649496 nuts in less than a complete set prior to engine overhaul torque nut P/N 652541 to the required value of the original fastener (P/N 634505 or 649496).

  1. Reinstall all engine components and baffles removed to facilitate this inspection in accordance with the aircraft manufacturer’s maintenance manual.

  2. Remove and replace the engine oil filter.

  3. Reinstall the oil sump drain plug with a new gasket; torque to the specified torque and safety wire. On engines equipped with an oil sump quick drain, close and secure the quick drain in accordance with the applicable instructions.

  4. Service the engine with the correct type and grade of oil.

  5. Install ignition leads on the proper spark plugs and screw on. Torque the ignition lead coupling nuts to 110 to 120 inch pounds.

  6. Perform a complete engine ground run up and ensure the engine meets the manufacturer’s specified operations limits.

  7. Thoroughly inspect the engine for oil and fuel leaks, broken, missing or loose hardware.

  8. Correct all discrepancies prior to returning the engine and aircraft to service.

  9. Make a logbook entry indicating compliance with this inspection. The entry must include the crankshaft serial number.

 

 

WARRANTY

 Warranty claims for labor and material used to comply with this Critical Service Bulletin must be submitted to your TCM Distributor.

TCM will allow a labor allowance up to 700 dollars for naturally aspirated engines and 900 dollars for turbocharged engines to comply with this Critical Service Bulletin.

TCM reserves the right to audit and review any claim beyond the stated allowances.

All warranty claims must have a copy of the repair work order attached. Failure to attach a copy of the repair work order will delay the processing of your warranty claim.


FIGURE 1. CONNECTING ROD IN POSITION FOR REMOVAL

 


FIGURE 2.REMOVING COUNTERWEIGHT RETAINING PLATES

 


FIGURE 3.REMOVING COUNTERWEIGHT PINS

 


FIGURE 4. STARTING COUNTERWEIGHT THROUGH CYLINDER OPENING

 


FIGURE 5.GUIDE COUNTERWEIGHT THROUGH CYLINDER OPENING

 


FIGURE 6. COUNTERWEIGHT REMOVED

 


FIGURE 7. CRANKSHAFT COUNTERWEIGHT BLADE

 


FIGURE 8. CRANKSHAFT COUNTERWEIGHT PARTIALLY REMOVED


FIGURE 9. FOCUS INSPECTION IN THIS AREA

 


FIGURE 10. CRANKSHAFT IN INSPECTION POSITION #2 CRANKCHEEK CONNECTING ROD REMOVED

 


FIGURE 11. CRANKSHAFT IN INSPECTION POSITION #5 CRANKCHEEK CONNECTING ROD REMOVED

 


FIGURE 12. COUNTERWEIGHT INSTALLATION

TABLE 1

CONNECTING ROD TORQUE

(FROM SB 96-7B)

SIZE

FASTENER

IN/LBS.

FT/LBS.

MODELS AFFECTED

.44-20

7/16-20

Nut-Connecting rod- Spiralock

(Nut hex P/N 643215 with

bolt P/N 643112)

550-600

45.8-50.0

L & IO-520-P, L & TSIO-520 AE & CE, IO-550, TSIO-550,

TSIOL-550

.44-20

7/16-20

Nut-Connecting rod Spiralock (12 Point Nut P/N 654490 with bolt

P/N 643112

 

690-710

 

57.5-59.2

FOR SPECIFIC APPLICATION

BY ROD PART NUMBER AND ENGINE SEE BELOW

.44-20

7/16-20

Nut-Connecting rod Spiralock (12 Point Nut P/N 654490 with bolt

P/N 654068)

 

690-710

 

57.5-59.2

FOR SPECIFIC APPLICATION

BY ROD PART NUMBER AND ENGINE SEE BELOW

.44-28

7/16-28

Nut-Connecting Rod (rod P/N 646476, bolt P/N 629340 nut-P/N 628109

475-525

39.6-43.8

IO-346, O-470, IO-470,

TSIO-470, IO-520, TSIO-520

(except L/TSIO-520 AE & CE)
         

ROD P/N 655000

(Nut 654490 & Bolt 643112)

ROD P/N 655001

(Nut 654490 & Bolt 643112)

ROD P/N 655003

(SET OF 6 BALANCED

IO-520-P

IO-550-A, B, C, D, E, F, G,

P/N 655001 Con-rods)

LIO-520-P

L, N

(Nut 654490 & Bolt 643112)

TSIO-520-AE

TSIOL-550-A, B, C

IO-550-B29, B33, B37, B39

LTSIO-520-AE

TSIO-520-CE

B44

 

TSIO-550A, B, C, E

IO-550-C25, C29, C30, C31

     

ROD P/N 655004

ROD P/N 655005

ROD P/N 655007

(Nut 654490 & Bolt 654068)

(Nut 654490 & Bolt 654068)

(SETOF 6 BALANCED
   

P/N 655005 Con-rods)

O-470-J, R, S, U

IO-520-BB, CB, MB,

(Nut 654490 & Bolt 654068)

IO-470-C, D, E, F, K, L, M, N, S, U, V,

TSIO-520-BB, BE, DB, EB, JB, KB, LB, NB, UB, VB,

TSIO-520-UB SPEC.13, 16,

17

IO-520-A, BA, C, D, E, F, J, K, L, M,

WB

  

TSIO-520-A, B, C, D, E, G, H, J, L, M, N, P, R, T

    
     

 


FIGURE 13. TWELVE POINT SPROCKET NUT

 


FIGURE 14. CASTELLATED NUT WITH COTTER PIN INSTALLED

TABLE 2

CYLINDER STUD NUT AND THROUGH BOLT NUT TORQUE

SIZE

FASTENER

IN/LBS.

FT/LBS.

MODELS AFFECTED

.44-20

Nut-Cyl. to crankcase studs.(includes 7th stud)

490-510

40.8-42.5

All models (except TSIOL-550)

.44-20

Nut-Cyl. To crankcase studs.

590-610

49.2-50.8

TSIOL-550

.44-20

Nut-Thru bolts at cad plated washer

440-460

36.6-38.3

All models (AR)

.50-20

Nut-Thru bolt at cad plated washer

615-635

51.2-52.9

IO-520, L/TSIO-520,

IO-550, TSIO-550

.50-20

Nut-6 Point-Thru bolt at cylinder flange

(P/N 634505 .33 in. high)

690-710

57.5-59.2

All 520, 550,

(Except TSIOL-550)

.50-20

Nut-Thru bolt at plated washers

690-710

57.5-59.2

TSIOL-550

.50-20

Nut-12 Point-Thru bolt at cylinder flange (P/N 652541)

790-810

65.8-67.5

All 520 & 550.

.50-20

Nut-Tall 6 point-thru bolt at cylinder flange.

(P/N 649496 .43 inch high)

790-810

65.8-67.5

TSIOL-550.

.50-20

Nut-Crankcase tie bolts-nose

640-660

53.3-55.0

All models(AR)

 


INTENTIONALLY
LEFT
BLANK