TM 9-2320-289-34
Table 2-1. Mechanical Troubleshooting (Con’t)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
step 4.
Drain cooling system. (See TM 9-2320-289-20) Remove engine mounts. (See
paragraph 3-3) Remove starter. (See TM 9-2320-289-20) Inspect 2 oil galley plugs
at front of engine block and 7 oil galley plugs at rear of engine block. Oil galley
plugs should be flush with engine block.
If oil galley plugs are damaged or recessed in engine block, cut slot in oil
galley plug with chisel, pry out, and discard. Apply sealant (Item 56,
Appendix B) to new oil galley plug, and using oil galley plug installer, drive
into engine block until flush.
If oil galley plugs protrude from engine block, drive into engine block until
flush using oil galley plug installer.
26. OVERHEATS
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Step 6.
Attempt to spin fan and fan clutch by hand.
If fan and fan clutch revolve more than five times without drag, replace fan
clutch. (See TM 9-2320-289-20)
Visually check to see if lateral movement of fan, as measured at fan blade,
exceeds approximately 0.25 in. (6.35 mm).
If lateral movement exceeds approximately 0.25 in. (6,35 mm), replace fan
clutch. (See TM 9-2320-289-20)
Check for silicone fluid leakage around fan clutch bearing assembly. Small leakage
will not normally affect operation.
If silicone fluid leakage appears excessive, replace fan clutch. (See
TM 9-2320-289-20)
Start engine, allow to reach operating temperature, then shut off, Carefully feel
radiator from right side to left side. Radiator should be warm on right side and hot
on left side, with an even temperature rise from right to left. Cold spots indicate
restrictions.
Repair or replace radiator if there are any restrictions.
(See
TM 9-2320-289-20 and TM 750-254)
Start engine and check for leakage from water pump and water pump plate.
If leakage is evident, replace water pump. (See paragraph 3-48)
Inspect each cylinder head gasket for leakage.
If there is leakage, remove and inspect cylinder head. (See paragraph 3-7) If
cylinder head does not require replacement, replace cylinder head gasket
and install cylinder head.
2-20
