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 TM 55-1905-223-24-3
TABLE 2-2. TROUBLESHOOTING-CONT.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
STEP
1. Check if pressure cap on remote expansion tank is incorrect or malfunctioning.
Check the gasket on the remote mounted expansion tank fill cap (TM 55-1905-223-24-18).
STEP
2. Check all hose clamps for security.
Inspect hose clamps. Tighten to 40 in-lb.
STEP
3. Check all hoses for leaks.
Inspect all coolant hoses. Correct leaks as necessary.
STEP
4. Check if coolant expansion plugs, pipe plugs, or fitting are leaking.
Inspect coolant plugs and fittings. Tighten or replace if necessary.
STEP
5. Check if gaskets are leaking or installed incorrectly.
Inspect gasket sealing surfaces, and install new gaskets as required.
STEP
6.
Check if lubricating oil cooler/filter is leaking.
a.
Inspect lubricating oil cooler (para. 2-34).
b.
Replace oil cooler/filter (para. 2-34).
STEP
7. Check if water pump seal is leaking.
Replace the water pump (para. 2-33).
STEP
8.
Check if aftercooler is leaking as follows:
a.
Disconnect the coolant supply and the return hoses from the aftercooler.
b.
Plug the hoses after removing them from the aftercooler.
NOTE
The engine must be operated at rated speed and full load to detect air in the cooling
system due to a defective aftercooler core.
c.
Repeat the test for air in the cooling system as previously described. If no air is found in the cooling
system with the aftercooler isolated, install a new aftercooler (para. 2-41).
STEP
9. Check for leaking coolant draincocks.
Check, tighten or replace if necessary.
5. Loss of engine coolant-internal.
STEP
1. Check for leaking cylinder head or gasket.
Refer to Malfunction 3, Step 5.
2-28
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