Unit Mechanical Troubleshooting - continued

TM 9-2320-386-24-1-1

0010 00

Unit Mechanical Troubleshooting (Contd)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Step 2. Check engine temperature gauge and engine temperature sending unit (Electrical

Troubleshooting, WP 0011 00).

a. Replace engine temperature gauge if defective (WP 0094 00).

b. Replace engine temperature sending unit if defective (WP 0114 00).

Step 3. Inspect drivebelts, belt tensioners, and pulleys of belt-driven accessories.

Replace any damaged parts (WP 0087 00, WP 0081 00, or WP 0084 00).

Step 4. Inspect fan for broken or missing blades.

Replace fan if blades are broken or missing (WP 0082 00).

Step 5. Inspect fan actuator and clutch for proper operation.

If fan turns freely, replace fan actuator and clutch (WP 0082 00 and WP 0085 00).

Step 6. Replace thermostat (WP 0077 00).

Start engine (TM 9-2320-386-10) and observe temperature gauge. If gauge reading exceeds

230F (110C), perform step 7.

Step 7. Remove surge tank filler cap and visually check coolant for proper circulation. Stop engine

if coolant is not circulating properly; replace water pump (WP 0080 00).

Step 8. Check coolant protection level with antifreeze tester.

If coolant is not within safe range, service cooling system (WP 0068 00).

Step 9. Check for clogged or broken radiator and charged air cooler.

a. For cleaning and flushing instructions, refer to TB 750-651.

b. Replace radiator or charged air cooler if damaged (WP 0069 00 or WP 0072 00).

END OF TESTING!

20. ENGINE DOES NOT REACH NORMAL OPERATING TEMPERATURE

Step 1. Start engine (TM 9-2320-386-10). Remove surge tank filler cap and visually check coolant

for proper circulation.

Stop engine. If coolant is circulating below 100F (38C), replace thermostat (WP 0077 00).

Step 2. Test coolant temperature gauge, sending unit, and electrical circuits (Electrical

Troubleshooting, WP 0011 00).

END OF TESTING!

21. COOLANT LOSS DURING NORMAL OPERATION

Step 1. Pressurize cooling system and check for leaks.

a. Tighten loose clamps, fasteners, or fittings.

b. Replace damaged parts (WP 0067 00).

Step 2. Check surge tank filler cap for proper relief pressure (TM 750-254). Relief pressure should

be 10 psi (69 kPa). Replace surge tank filler cap if defective.

Step 3. Check for coolant in oil.

If coolant is found in oil, notify direct support maintenance.

END OF TESTING!

TRANSMISSION

22. TRANSMISSION SHIFTS OCCUR AT TOO HIGH A SPEED

Check transmission oil level (TM 9-2320-386-10).

Drain or fill as necessary (WP 0023 00).

END OF TESTING!

0010 00-8