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 TM 55-1905-220-14-3
Table 3-8. Propulsion Engine - Abnormal Engine Coolant Operating
Temperature Troubleshooting.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
Temperature above normal (Cont).
Step 1.
Check for insufficient heat transfer.
Clean the cooling system with a good cooling system cleaner and thoroughly flush to remove
scale deposits.
Step 2.
Check for poor circulation.
a. Check the coolant level and fill to the filler neck if the coolant level is low.
b. Inspect for collapsed or disintegrated hoses.
Replace faulty hoses. Refer to paragraph 3-20.
c.
Thermostat may be inoperative. Remove, inspect and test the thermostat; replace if
found faulty. Refer to paragraph 3-22.
d. Check the water pump for a loose or damaged impeller.
Refer to paragraph 3-18.
e. Check the flow of coolant through the expansion tank and keel coolers. A clogged
expansion tank or keel cooler will cause an inadequate supply of coolant on the suction side
of the pump. Clean the expansion tank, and keel coolers. Refer to paragraph 3-19 and Direct
Support Maintenance.
Remove the coolant filler cap and operate the engine, checking for combustion gases in the
cooling system. The cylinder head must be removed and inspected for cracks and the head
gaskets replaced if combustion gases are entering the cooling system. Refer to paragraph 3-
34.
Check for an air leak on the suction side of the water pump. Replace defective parts. Refer
to paragraph 3-18.
3-53
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