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TM 5-2420-222-34
3-4.
ENGINE BLOCK MAINTENANCE (Con’t).
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
Ensure that bearing faces are not damaged while installing crankshaft.
14.
Using lifting device, lift and place new crankshaft (25) in position on engine block (1).
15.
Position four pillow block or main bearing caps (15) with new bearing halves (24) in place on crankshaft (25) and
engine block (1). Ensure that pillow block or main bearing caps are in correct location as numbered, with pointer
arrow facing toward camshaft side of engine block.
16.
Position rear pillow block cap (19) with new bearing half (22) in place on crankshaft (25). Ensure that pillow block
cap is in correct location and pointer arrow is facing toward camshaft side of engine block (1).
17.
Coat threads of eight screws (17) with engine oil. Install eight screws and washers (16) in four pillow block or
main bearing caps (15) and engine block (1).
18.
Coat threads of two screws (20) with engine oil. Install two screws and washers (21) in rear pillow block cap (19)
and engine block (1).
19.
Using ball-peen hammer and wood block, tap crankshaft (25) to the front and rear and aline front and rear bearing
half (18, 22, 23, and 24) flanges.
20.
Torque screws (17 and 20) to 85 lb.-ft. (115 Nom).
21.
Install screw to end of crankshaft (25). Using screw, turn crankshaft two full revolutions. Crankshaft must turn
freely. If crankshaft does not turn freely, replace engine block (1).
22.
Remove two screws (20), washers (21), and rear pillow block cap (19) with rear bearing half (22) from engine
block (1). Remove rear bearing half from pillow block cap.
23.
Remove eight screws (17), washers (16), and four pillow block or main bearing caps (15) with bearing halves (24)
from engine block (1). Remove bearing halves from pillow block or main bearing caps.
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.
24.
Using lifting device, remove crankshaft (25) from engine block (1) and set on wood blocks.
25.
Remove four new bearing halves (23) and new rear bearing half (18) from engine block (1).
26.
Using rod measuring kit, measure inside diameter of control cam bores. Diameter must be 1.6245-1.6255 in.
(41.2623-41.2877 mm). Ensure that measurement is taken with control cam bearings removed.
27.
Using rod measuring kit, measure inside diameter of camshaft bore. Diameter must be 2.2042-2.2052 in.
(55.9867-56.0121 mm).
3-28
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