TM 9-2320-260-20
Table 2-2. Mechanical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2. If problem persists, notify your supervisor.
END OF TESTING!
16. EXCESSIVE EXHAUST NOISE
Inspect exhaust pipes for secure connections, cracks, breaks, and excessive rust.
Replace damaged parts (chapter 3, section VI).
END OF TESTING!
17. EXHAUST FUMES IN CAB
a. Replace damaged parts (chapter 3, section VI).
b. If exhaust manifold is leaking or damaged, notify your supervisor.
END OF TESTING!
COOLING SYSTEM
18. ENGINE COOLANT TEMPERATURE GAGE ABOVE 230F (110C)
Care should be taken when removing surge tank filler cap. Steam
or hot coolant under pressure may cause injury to personnel.
Step 1. Check coolant protection level with antifreeze tester.
CAUTION
Do not add coolant when engine is hot. Internal engine damage
could result.
If coolant is not within safe range, service cooling system (para. 3-45).
Step
2. Inspect drivebelts and drive pulleys of accessories for damage and check belt tension.
a. Replace or adjust drivebelts (para. 3-52, 3-54, 4-4, or 9-16).
b. Replace accessory if drive pulley will not turn (para. 3-49, 3-55, 4-2, or 9-17).
Step
3. Inspect radiator, hoses and hose connections, drain valves, and surge tank for leaks.
a. Tighten hose clamps and fittings.
b. Replace defective cooling system components (chapter 3, section VII).
c. Tighten or close drain valves.
d. Replace leaking radiator (para. 3-50).
e. Replace leaking surge tank (para. 3-48).
Step
4. Inspect fan blade for broken or missing blades.
Replace fan blade (para. 3-53).
Step
5. Inspect radiator for bent fins and airflow obstructions.
Straighten bent fins, clear obstructions, or replace radiator (para. 3-50).
Step
6. Check cooling system for restriction.
Clean and flush system (para. 3-45).
Step
7. Check operation of temperature gage (table 2-4, electrical troubleshooting, malfunction 30).
Replace thermostat if condition continues (para. 3-47).
END OF TESTING!
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