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 TM 55-1905-223-24-5
Table 2-2. Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
WARNING
Make sure engine is cooled to below 120 (50 ) to avoid burn injury.
F
C
1. Coolant temperature above normal.
STEP 1. Check for low coolant level.
Add coolant as required (refer to PMCS Table 2-1, Item 5).
STEP 2. Check for collapsed or restricted hoses.
Replace hoses as needed (paras. 2-23, 2-29, and 2-32).
STEP 3. Check for loose water pump belt.
Check belt tension and tighten if necessary (para. 2-29).
STEP 4. Check for incorrect oil level.
Add or drain engine oil (refer to PMCS Table 2-1, Item 4).
STEP 5. Check for malfunctioning temperature gauge.
a. Test the gauge as follows:
(1) Check for a tripped circuit breaker on the instrument panel (para. 2-22).
(2) Check the wiring from the gauge to the sending unit for a broken connection.
(3) Check the temperature sending unit in the front upper water manifold (para. 2-24).
(4) Use a temperature gauge of known accuracy to check system.
(5) Replace faulty gauge (para. 2-22).
STEP 6. Check for incorrect or malfunctioning pressure cap.
Check the gasket on expansion tank fill cap (para. 2-35).
STEP 7. Check for air in the cooling system.
a. Remove pressure cap from the expansion tank.
b. Install a pressure cap which has had the spring and relief valve removed to allow free flow from
the overflow tube.
c. Attach a hose to the overflow connection.
d. Put the hose end into a container of water.
e. Operate the engine until water temperature reaches 180 (80 ).
F
C
f. Check for a continuous flow of bubbles coming from the end of the hose submerged in water.;
g. A continuous flow of air bubbles indicates the following:
(1) Aftercooler core leaks.
(2) Cylinder liner protrusion incorrect.
(3) Cracked cylinder liner.
(4) Cylinder head or gasket leakage.
2-26
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