TM 9-2320-272-10
Table 3-1. Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5.
ENGINE OVERHEATS AS INDICATED BY ENGINE COOLANT TEMPERATURE GAUGE
WARNING
Extreme care should be taken when removing surge tank filler cap if temperature gauge reads above
175°F (79°C). Steam or hot coolant under pressure will cause injury.
Step 1.
Check radiator core for obstructions.
If clogged, remove debris (refer to table 2-1).
Step 2.
Check coolant level in surge tank.
If low, add coolant to surge tank until at bottom of fill neck.
Step 3.
Check for leakage from radiator, surge tank, hoses, and hose connections.
If loose, tighten. If still leaking, notify unit maintenance.
Step 4.
Check engine oil level.
If low, add oil (refer to LO 9-2320-272-12).
Step 5.
Check radiator fan clutch operation.
If fan blade is not turning, install override lockup bolts (para. 3-14).
6.
LOW ENGINE OIL PRESSURE.
Check engine oil level.
If low, add oil (refer to LO 9-2320-272-12).
NOTE
•
If oil pressure is still low, notify unit maintenance.
7.
ENGINE FAILURE DURING OPERATION.
Step 1.
Check to see if emergency stop cable is pulled out.
On M939A2 series vehicles, manually reset emergency stop. On M939/A1 series vehicles, notify unit
maintenance.
Step 2.
Check to see if throttle control solenoid is malfunctioning (M939/A2 series vehicles).
If solenoid is malfunctioning, tie up with strap or rope and finish mission. Report to unit maintenance as
soon as possible.
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