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 TM 55-1905-219-14-3
Table 3-8. Propulsion Engine - Abnormal Engine Coolant Operating
Temperature Troubleshooting.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
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
3-22.
Step 2.
Check for excessive leakage at thermostat seal.
Excessive leakage of coolant past the thermostat
seal(s) is a cause of continued low coolan oper-
t
ating temperature. When this occurs, replace the
thermostat seal(s). Refer to paragraph 3-22.
Table 3-9. Propulsion Engine - Low or High Exhaust Valve Opening
Pressure Troubleshooting.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. Low exhaust valve opening pressure.
Step 1.
Check for worn or eroded valve seat.
Replace worn or eroded valve seat. Refer to para-
graph 3-34.
Step 2.
Check valve seat for chips at point of contact with
valve.
Replace the valve seat. Refer to paragraph 3-34.
Step 3.
Check for cracked valve seat.
Replace the valve seat. Refer to paragraph 3-34.
3-56
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