Quantcast Section VI. BEARING HALVES INSPECTION

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TM 9-2815-226-34-1
Section VI. BEARING HALVES INSPECTION
3-15. INSPECT BEARING HALVES
NOTE
Main bearings are two-piece halves with upper half containing an oil hole for
passage of lubricating oil.
a. Measure bearing half thickness with ball point micrometer.
b. Discard bearing half if thickness less than 0.1215 in. (3.086 mm).
NOTE
A properly fit bearing will appear dull gray after a reasonable period of service.
This indicates bearing is running on an oil film. Bright spots indicate metal-to-
metal contact. Black spots indicate excessive clearance.
c. Inspect bearing for chips, flaking, or scoring. Replace if defective.
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