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TM 5-2420-222-34
3-4.
ENGINE BLOCK MAINTENANCE (Con’t).
6.
Position four pillow block or main bearing caps (15) and rear pillow block cap (19) in place on engine block (1) in
correct location as numbered, with pointer arrow facing toward camshaft side of engine block.
7.
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). Torque screws to 85 lb.-ft. (115 N•m).
8.
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). Torque screws to 85 lb.-ft. (115 N•m).
9.
Using rod measuring kit, measure inside diameter of five main bearing bores. Inside diameter of each bore must
be 3.3250-3.3260 in. (84.4550-84.4804 mm). If any bore is not within specified diameter, replace engine block
(1).
10.
Remove two screws (20), washers (21), and rear pillow block cap (19) from engine block (1).
11.
Remove eight screws (17), washers (16), and four pillow block or main bearing caps (15) from engine block (1).
NOTE
Perform steps 12 through 29 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.
Lubricate four new bearing halves (23) and new rear bearing half (18) with engine oil. Slide bearing halves into
position on engine block (1). Ensure that tangs on bearing halves fit in locking grooves in engine block and oil
holes in bearings aline with oil passages in engine block.
13.
Lubricate four new bearing halves (24) and new rear bearing half (22) with engine oil. Slide bearing halves into
position in pillow block or main bearing caps (15) and rear pillow block cap (19). Ensure that tangs on bearing
halves fit in locking grooves in pillow block or main bearing caps and rear pillow block cap.
3-26
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