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 TM 9-2815-220-24
CRANKSHAFT MAIN BEARINGS INSPECTION
0138 00
INSPECTION (Continued)
1. Visually inspect used main bearing halves (1, 2, 3, and 4) to the following table. If any
bearing is questionable, replace it.
Basis for Bearing Rejection
Acceptable Bearing Flaws
Separation of bearing metal, or signs of possible Fine scratches on bearing surface.
separation.
Pitting or any other form of destruction to
Minute pieces of metal and dirt particles
bearing surface.
embedded in bearing surface with a
concentration of less than 5 percent. (Do not
attempt to remove such particles.)
Raised metal at edges of scratches.
Pieces of metal or dirt particles embedded in
bearing surface with a concentration of
5 percent or more of the surface area.
2. Measure outside width (A) of main thrust bearing (1, 2) using micrometer (item 17, WP 0176).
Replace bearings that do not meet the following limits:
Point of Measurement
Sizes and Fits of New Parts
Wear Limits
inches (mm)
A (Outside width of main thrust
2.4860 (63.1444) 2.4880 (63.1952) 2.4840 (63.0936)
bearing)
1
3
A
2
4
WP 0138 00-2
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