COOLING SYSTEM - TM-10-3930-633-340016

TM 10-3930-633-34

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

FUEL SYSTEM Continued

3. HIGH FUEL CONSUMPTIONContinued

Step 2. Check governor adjustment.

Adjust governor to specifications (see TM 10-3930-633-12).

Step 3. Check fuel lines and fuel tank for leakage.

Replace or tighten leaky fuel lines (see TM 10-3930-633-12). Repair fuel tank (para. 4-2).

Step 4. Check engine operating temperature; overheated engine will use excessive fuel.

Refer to cooling systems tests (see TM 10-3930-633-12).

Step 5. Check engine timing.

Correct timing to specifications (see TM 10-3930-633-12):

Step 6. Check for weak spark.

Refer to ignition system tests (see TM 10-3930-633-12).

Step 7. Check for restricted air cleaner.

Service air cleaner (see TM 10-3930-633-12).

Step 8. Check for low engine compression.

If compression is low, overhaul engine (Chapter 6).

Step 9. Check for dragging brakes.

Adjust brake lining clearance (see TM 10-3930-633-12).

Step 10. Check tires for low inflation pressure.

Inflate front tires to 100 PSI, rear tires to 45 PSI.

COOLING SYSTEM

1. LOSS OF (COOLANT).

Step 1. Check for leaks at radiator and hose connections.

Replace defective hoses, tighten loose clamps (See TM 10-3930-633-12). Remove and repair radiator (para. 5-

3).

Step 2. Check for engine overheating, causing afterboil.

Refer to engine overheating tests and inspections (see TM 10-3930-633-12).

Step 3. Check for leakage at water pump.

Replace leaking water pump (see TM 10-3930-633-12).

Step 4. Check for evidence of water in engine crankcase, indicating cracked cylinder head or blown head gasket.

Replace cylinder head and gasket (see TM 10-3930-633-12).

Step 5. Check for evidence of water in transmission fluid, indicating a leak in the oil cooler.

Replace radiator (see TM 10-3930-633-12).

2. ENGINE OVERHEATS.

Step 1. Check coolant level.

Fill radiator to proper level.

Step 2. Remove and test thermostat.

Replace inoperative thermostat (see TM 10-3930-633-12).

Step 3. Check for broken or loose fan belt.

Tighten or replace fan belt (see TM 10-3930-633.12).

Step 4. Check radiator for obstruction.

Clean away obstruction; steam clean radiator core (see TM 10-3930-633-12).

Step 5. Check for proper coolant flow through radiator.

Pressure flush radiator to clear obstructions. Replace thermostat, if sticking (see TM 10-3930-633-12).

Step 6. Check ignition timing.

Set timing to specifications (see TM 10-3930-633-12).

Step 7. Check water pump for broken impeller.

Repair water pump (see TM 10-3930-633-12).

Step 8. Check for restricted air cleaner.

Replace air cleaner element, clear obstruction from air intake system (see TM 10-3930-633-12).

Step 9. Check for bent or clogged exhaust pipe or muffler, creating excessive back pressure.

Replace damaged parts (see TM 10-3930-633-12). .

3. ENGINE RUNNING TOO COOL.

Step 1. Check operation of thermostat in restricting cold water flow through radiator.

Replace stuck thermostat (see TM 10-3930-633-12).

Step 2. Check to determine if overcooking is the result of extended outside operation in low ambient temperatures.

Cover part of radiator core to obstruct air flow.

ELECTRICAL SYSTEM

1. BATTERY WEAK OR FAILS TO MAINTAIN CHARGE.

Step 1. Check battery electrolyte level.

Add distilled water to cover plates, check for cracked case and replace battery if cracks are found.

Step 2. Check for shorted cell in battery.

Replace battery.

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