ENGINE DOES NOT REACH OPERATING TEMPERATURE (Cont)

TM 9-2320-285-24-1

2-11. COOLING SYSTEM TROUBLESHOOTING (CONT)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

2. ENGINE DOES NOT REACH OPERATING TEMPERATURE (Cont)

WARNING

Wear safety glasses, and stand clear of loosened air line fitting. High pressure air

can propel debris at high speed, causing eye injury or blindness.

Step 5.

With key switch turned to on position, engine shut down, and at least 100 psi pressure in air system,

carefully disconnect air line from outlet side of solenoid.

a. If air escapes from solenoid, solenoid is defective; replace (para 2-15e).

b. If air does not escape from solenoid, go to step 6 below.

Step 6.

Have assistant momentarily turn key switch to off position. Watch solenoid.

a. If air escapes from solenoid, go to step 7 below.

b. If air does not escape from solenoid, replace solenoid (para 2-15e).

Step 7.

With key switch turned to on position, engine shut down, and at least 100 psi pressure in air system, try

to rotate fan manually.

a. If fan does not rotate, notify direct support maintenance.

b. If fan rotates, notify direct support maintenance (refer to TM 9-2815-205-34 for troubleshooting of the

engine and its components).

3. COOLANT SYSTEM NOT PRESSURIZED

Pressure test radiator cap (para 2-15a(2)).

a. If radiator cap pressure is not 6 to 9 pounds, or if pressure drops rapidly, replace radiator cap.

b. If radiator cap pressure is 6 to 9 pounds, and remains steady for at least 30 seconds before

dropping, notify direct support maintenance.

4. COOLANT NOT WARMED WHEN COOLANT HEATER CONNECTED TO POWER SOURCE

Refer to para 2-68 to troubleshoot coolant heater and pump.

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