2-17. Crankshaft Repair

TM 9-2815-237-34 · Chapter 2 — Engine Maintenance

This task covers:

a. Cleaning c. Repair

b. Inspection

INITIAL SETUP

    Tools                                                Equipment Condition
        General mechanic’s tool kit:                       Engine disassembled into subassemblies
         automotive (Appendix E, Item 1)                   (para. 2-15).
        Micrometer (Appendix E, Item 16)
    Materials/Parts
        Abrasive crocus cloth (Appendix B, Item 5)
    Manual References
        TM 9-2815-237-34P

     a. Cleaning

1. Clean all drilled oil passages (5) with a rod and cloth.
2. Refer to para. 2-9 for additional cleaning information.
     b. Inspection

                                                    NOTE
                           For general inspection instructions, refer to para. 2-10.
1. Inspect crankshaft (1) for scratches, nicks, and cracks. Replace if scratched, nicked, or cracked.
2. Check main bearing journals (4) and connecting rod journals (6) for taper, out-of-round, and
     diameter using an outside micrometer. Replace crankshaft (1) if any bearing journal is tapered,
     out-of-round, or out of specifications (table 2-2 or 2-3).
3. Inspect rear seal area (3) for roughness, scoring, grooving, flaking, pitting, and galling. Replace
     crankshaft (1) if rough, scored, grooved, flaked, pitted, or galled.
4. Inspect threaded holes (2) and (7) in crankshaft (1) for damage. Replace crankshaft (1) if threads
     are damaged.
    c. Repair

Buff all minor nicks and scratches using abrasive crocus cloth.