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 TM 55-1905-220-14-3
Table 3-29.
Generator Engine - Abnormal Engine Coolant Operating
Temperature Troubleshooting (Cont).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. Temperature above normal (Cont).
Step 2.
c.
Thermostat may be inoperative. Remove, inspect and test the thermostat.
Replace if found faulty. Refer to paragraph 3-78.
d. Check the water pump for a loose or damaged impeller. Refer to paragraph 3-
75.
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 3-76 and Direct Support Maintenance.
f.
Remove the coolant filler cap and operate the engine, checking for combustion
gases in the cooling system. The cylinder head must be re- moved and
inspected for cracks and the head gaskets replaced if combustion gases are
entering the cooling system. Refer to paragraph 3-89.
g. Check for an air leak on the suction side of the water pump. Replace defective
parts. Refer to paragraph 3-75.
2.
Temperature below normal.
Step 1.
Check for improper circulation.
The thermostat may not be closing. Remove, inspect and test the thermostat.
Install a new thermostat, if necessary. Refer to paragraph 3-78. Check for an
improperly installed heater.
Step 2.
Check for excessive leakage at thermostat seal.
Excessive leakage of coolant past the thermostat seal(s) is a cause of continued
low coolant operating temperature. When this occurs, replace the thermostat
seal(s). Refer to paragraph 3-78.
3-109
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