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 TM 55-1905-223-24-5
Table 2-2. Troubleshooting-CONT
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
STEP 2. Check for incorrect or malfunctioning thermostat, do the following:
a. Remove the upper heat exchanger hose from the thermostat housing.
b. Install a hose of the same size on the thermostat housing outlet long enough to reach a remote dry
container used to collect coolant.
c. Install and tighten a hose clamp on the housing outlet.
d. Install the end of the hose in a dry container.
e. Operate the engine operated RPM for one (1) minute.
f. Shut the engine off, and measure the amount of coolant collected in the container.
g. The amount of coolant collected must not be more than 3.3 fluid ounces (100 cc).
h. If more than 3.3 fluid ounces (100 cc) of coolant is collected, the thermostat or the thermostat seal
is leaking.
i. Remove the thermostat and inspect thermostat and thermostat seal (para. 2-24).
3. Loss of engine coolant (overflow).
STEP 1. Check for overfilled cooling system.
Drain coolant to proper level.
STEP 2. Check for dirt, scale or sludge in the cooling system.
Clean cooling system (TB 55-1900-207-24).
STEP 3. Check for frozen coolant due to incorrect antifreeze concentration.
Check coolant antifreeze concentration (TB 55-1900-207-24).
STEP 4. Check for overheating engine.
Refer to Malfunction 1 of this table.
4. Loss of engine coolant (external leakage).
STEP 1. Check for incorrect or malfunctioning expansion tank fill cap.
Check the gasket on expansion tank fill cap (para. 2-35).
STEP 2. Check for loose hose clamp.
Tighten clamp to 40 in-lb. torque.
STEP 3. Check for leaking hoses.
Inspect hoses. Replace if necessary.
STEP 4. Check for leaking coolant draincocks.
Check, tighten or replace if necessary.
STEP 5. Check for leaking coolant expansion plugs, pipe plugs, or fittings.
Tighten or replace if necessary.
2-28
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