TM9-2815-226-34-1 - JATONKAM35s HOME ON THE WEB

TM 9-2815-226-34-1o. Limits listed in the following steps must be maintained within Critical Region. Dimensional value of Critical Regionis the vertical distance measured downward from the crankpin centerline and extending longitudinally for all crankwebs between region (3) on the crankpin and crankpin hole (1) on the journal.CAUTIONWHENEVER STRUCTURAL DAMAGE HAS OCCURRED TO AN ENGINE SUCH ASPISTON OR VALVE BREAKAGE, THROWN ROD, ETC., A MAGNAFLUXINSPECTION MUST BE ACCOMPLISHED TO DETECT POSSIBLE RUPTURES ANDCRACKS. FAILURE TO ACCOMPLISH THIS INSPECTION COULD LEAD TO EARLYENGINE FAILURE AND SERIOUS DAMAGE.(1) Indications located less than 1 in. (25.4 mm) from the major axis of centerline (8) adjacent web (measurecircumferentially) must not exceed the following limits:LEGEND:1. CRANKPIN HOLE 13. KNURLING2. CRANKPINS 14. CHAMBER OF MAIN BEARING OIL HOLE3. CRANKPIN WALL 15. MAIN BEARING JOURNAL SURFACES4. FILLETS-MAIN JOURNAL-DEEP 16. COUNTERWEIGHT CORNERS5. MAIN JOURNAL FILLETS 17. WEBS6. CRITICAL REGION 18. WEB SURFACES7. MAJOR JOURNAL WALLS 19. CONNECTING ROD BEARING CRANKSHAFT8. MAJOR AXIS OR CENTERLINE OF JOURNAL SURFACES9. JOURNAL SURFACE DEPTH 20. CONNECTING ROD BEARING CRANKSHAFT10. JOURNAL SURFACE THICKNESS 21. WEB PERIPHERY11. REAR SEAL SURFACE FACES 22. MAIN JOURNAL WALLS12. SEAL AREA 23. FLANK CHEEK24. THRUST FLANGE FILLET(a)(b)Light indications in or entering fillets (5) are acceptable if not more than 1/8 in. long (open) or 1/4 in. long(subsurface).Light open indications on crankpin (2) and main journal walls (18)or bearing surface that extend closer than 1/8 in.to fillets (5), but do not enter fillets, are acceptable if 3/16 in. long or less. Light subsurface indications areacceptable.3-121