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 TM 55-1905-219-14-3
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, in-
spect and test the thermostat. Replace if
found faulty. Refer to paragraph 3-78.
d.
Check the water pump for a loose or damag d
e
impeller. Refer to paragraph 3-75.
e.
Check the flow of coolant through the expan-
sion tank and keel coolers. A clogged expan-
sion tank or keel cooler will cause an inade-
quate 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 en-
tering 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.
3-112
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