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TM 10-3930-659-34
5-1.
ENGINE BLOCK MAINTENANCE (Con’t).
NOTE
Perform steps 12 through 20 to check engine block main bearing bore alinement. New bearings
and a new crankshaft are used to eliminate any error which might exist from using worn bearings
or crankshaft.
12.
Apply lubricating oil to six upper main bearings (26) and upper thrust bearing (25). Position upper main and thrust
bearings on engine block (1). Ensure that tangs on upper bearings fit in locking grooves on engine block and oil
holes in bearings aline with oil passages in engine block.
13.
Apply lubricating oil to six lower main bearings (23) and lower thrust bearing (24). Position lower main bearings on
six main bearing caps (14) and lower thrust bearing on thrust bearing cap (18). Ensure that tangs on lower
bearings fit in locking grooves in main bearing caps and thrust bearing cap.
WARNING
Use extreme caution when handling heavy parts. Lifting device is required when parts weigh over
50 lb (23 kg) for a single person lift, over 100 lb (45 kg) for a two person lift, and over 150 lb (68 kg)
for a three or more person lift. Keep clear of heavy parts supported only by lifting device. Failure
to follow this warning may cause serious injury or death to personnel.
CAUTION
•
DO NOT install crankshaft by hand. Use a suitable lifting device or parts may be damaged.
•
When installing crankshaft in engine block, ensure that crankshaft does not hit against engine block.
Crankshaft hitting against engine block may damage parts.
•
Ensure that bearing faces are not damaged when installing crankshaft.
14.
Using suitable lifting device, position new crankshaft (22) in engine block (1).
NOTE
Main bearing caps and thrust bearing cap must be installed in correct numbered location with indicator
arrow facing camshaft side of engine block.
15.
Apply lubricating oil to threads of 12 screws (16). Install six main bearing caps (14) on crankshaft (22) with 12
washers (15) and screws.
16.
Apply lubricating oil to threads of two screws (20). Install thrust bearing cap (18) on crankshaft (22) with two
washers (19) and screws.
17.
Using hammer and wood block, tap crankshaft (22) to rear of engine block (1). Aline front flanges of upper and
lower main and thrust bearings (23, 24, 25, and 26).
18.
Using hammer and wood block, tap crankshaft (22) to front of engine block (1). Aline rear flanges of upper and
lower main and thrust bearings (23, 24, 25, and 26).
5-6
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