TM 5-4310-387-14
6-21. Crankshaft and Mainbearing Support (Cont).
(12)
Coat inside bore of bushing (15) with clean engine oil.
(13)
Install crankshaft (14).
(14)
Install new bearing (13) in carrier (6) and secure with snap ring (12).
(15)
Install new gasket (11), new preformed packing (10), preformed packing retainer (9), oil seal (8), and two
belleville washers (7), ensure belleville washers (7) curved surfaces are away from each other, and carrier
(6).
(16)
Tap carrier (6) with mallet, to seat carrier (6).
(17)
Secure carrier (6) with four nuts (3) and washers (4). Torque nuts to 22-25 Ib-ft (30-34 Nm).
(18)
Install key (2) and gear (1).
FOLLOW-ON MAINTENANCE
(1) Install oil pump assembly (para. 5-34).
(2) Install governor assembly (para. 6-17).
(3) Install oil filter screen (para. 4-31).
(4) Install piston and connecting rod assemblies (para. 6-20).
(5) Install flywheel (para. 5-35).
b.
Replace. (figure 6-22)
(1)
Remove crankshaft (para. a.).
WARNING
Dry cleaning solvent, PD-680 used to clean parts is potentially dangerous to personnel and
property. Avoid repeated and prolonged skin contact. Do not use near open flame or excessive
heat. Flash point of solvent is 138°F (60°C).
(2)
Clean all items, except bearing (1), preformed packing (2) and oil seal (3) with dry cleaning solvent and
dry thoroughly.
(3)
Hold inner race of bearing (1) and turn outer race slowly. Replace bearing (1) if rough of sticking spots
are felt.
(4)
Inspect gear (4) and replace if teeth are worn, chipped, or gear is otherwise damaged.
(5)
Inspect bushing (5) and replace if bore diameter is greater than 1.579 in. (40.08 mm).
(6)
Inspect connecting rod bearings (6) and replace if diameter is greater than 1.577 in. (40.020 mm).
(7)
Inspect crankshaft (7) and replace if bearing surface diameter is less than 1.576 in. (39.99 mm) or main
bearing surface diameter is less than 1.577 in. (40.02 mm).
6-60
