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 TM 10-3930-660-24-2
CRANKSHAFT MAIN BEARINGS MAINTENANCE - CONTINUED
0272 00
CLEANING
CAUTION
Never use any type of rough material or tools such as sandpaper, emery or crocus cloth, files, or glassbead
cleaning equipment to clean bearings.
See Cleaning instructions (WP 0316 00).
1.
2.
Apply a light coat of oil over the bearings and the bearing surface in the bearing caps if the bearings are not going to be
installed within one hour after cleaning.
INSPECTION
1.
Inspect main bearings and thrust bearing. Replace bearing if:
a.
Back of bearing shows that fretting has taken place
b.
Back of bearing has a mirror-like (shiny) finish
c.
There are scratches in the bearing surface which do not disappear after cleaning
d.
Bearing surface has material damage such as cracks or flaking
e.
There is a hole in the bearing surface
f.
Bearing shows wear on the mating face
g.
Bearing oil hole is distorted
h.
There are hot spots in bearing surface
i.
Bearing has damage to the tab
2.
Inspect thrust bearing flanges for damage. If damaged, replace thrust bearing.
3.
Inspect main bearing bores in the block for cracks, chips, distortion, thread damage, or other damage. Replace cylinder
block if there is bearing bore damage.
Inspect and measure crankshaft main bearing journals (refer to Removal).
4.
5.
Inspect main bearing caps for cracks, fretted or chipped mating surfaces, distortion or damaged ring dowels.
6.
Replace a damaged bearing cap.
7.
Replace both bearing cap ring dowels if one or both are damaged.
0272 00-3
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