INSPECTION - TM-10-3930-638-24-P0807

TM 10-3930-638-24&P

4-2. ENGINE MAINTENANCE (cont)

d. Crankshaft and Main Bearings (cont).

REMARKS

ACTION

ITEM

LOCATION

STEP

INSPECTION (cont)

NOTE

(cont)

When connecting rod journals are worn more than 0.002 inch,

grind undersize to following dimensions:

Grind

Outer Diameter

to (inches)

Undersize (inch)

2.2460 to 2.2470

0.002

0.010

2.2380 to 2.2390

0.020

2.2280 to 2.2290

2.2180 to 2.2190

0.030

If one or more journals are to be ground, then grind all journals.

e. Crankshaft connect-

Measure

Measure 90 degrees from first measurement

for out-of-roundness. If out-of-roundness

ing rod journals

exceeds 0.0005 inch, regrind journal

NOTE

If crankshaft was reground, repeat step 5 of inspection.

Inspect for cracks, damage, missing or

Crankshaft gear (9)

Inspect

broken teeth, scoring, pits and wear. If

any of these conditions observed, replace

gear

Slide out

a. Remove

Center main

Center main bear-

ing liners (13)

bearing cap (6)

b. Inspect

Inspect for cracks, scoring, pitting, flaking,

or signs of overheating. Check liner back

for bright spots. Replace if any of these

conditions observed

c. Measure thrust Use micrometer. Replace if thickness less

surface thick-

than 0.1025 inch

ness

4-29