Table 3-8. Propulsion Engine - Abnormal Engine Coolant Operating Temperature Troubleshooting

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Table 3-7. Propulsion Engine - Low Oil Pressure Troubleshooting. (Cont).

TM-55-1905-219-14-3 Landing Craft Utility (LCU) 1667 Class Boston Hull Numbers 1667-1670 NSN 1905-00-168-5764 Manual

Table 3-8. Propulsion Engine - Abnormal Engine Coolant Operating Temperature Troubleshooting-cont.

TM 55-1905-219-14-3

Table 3-8. Propulsion Engine - Abnormal Engine Coolant Operating

Temperature Troubleshooting.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1. Temperature above normal (Cont).

Step 1.

Check for insufficient heat transfer.

Clean the cooling system with a good cooling

system cleaner and thoroughly flush to remove

scale deposits.

Step 2.

Check for poor circulation.

a. Check the coolant level and fill to the filler

neck if the coolant level is low.

b. Inspect for collapsed or disintegrated hoses.

Replace faulty hoses. Refer to paragraph 3-20.

c. Thermostat may be inoperative. Remove, in-

spect and test the thermostat; replace if

found faulty. Refer to paragraph 3-22.

d. Check the water pump for a loose or damaged

impeller. Refer to paragraph 3-18.

e. Check the flow of coolant through the expan-

sion tank and keel coolers. A clogged expan-

sion tank or keel cooler will cause an inade-

quate supply of coolant on the suction side

of the pump. Clean the expansion tank, and

keel coolers. Refer to paragraph 3-19 and

Direct Support Maintenance.

Remove the coolant filler cap and operate the

engine, checking for combustion gases in the

cooling system. The cylinder head must be removed

and inspected for cracks and the head gaskets

replaced if combustion gases are entering the

cooling system. Refer to paragraph 3-34.

Check for an air leak on the suction side of the

water pump. Replace defective parts. Refer to

paragraph 3-18.

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