ENGINE COOLANT TEMPERATURE TOO HIGH (GAGE READS IN OVERHEAT RANGE)

TM 5-2420-222-20-1

ORGANIZATIONAL TROUBLESHOOTING - CONTINUED

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

7. ENGINE OIL PRESSURE LOW (INDICATOR LIGHT ON) CONTINUED

Step 3.

Remove and inspect engine oil filter element (page 2-168). Check for obstructions and damage.

a. If oil filter element was not obstructed or damaged, install engine oil filter element (page 2-168).

Notify Direct Support Maintenance.

b. If engine oil filter element was obstructed or damaged, replace it (page 2-168).

8. ENGINE COOLANT TEMPERATURE TOO HIGH (GAGE READS IN OVERHEAT RANGE)

WARNING

Be careful when removing radiator cap. If engine is hot, escaping steam could burn you. Use a rag to

cover radiator cap to protect your hand. Unscrew cap just enough to allow any built-up steam to

escape. When all pressure has been relieved, unscrew cap the rest of the way, and take it off of

radiator.

Step 1.

Unscrew and remove radiator filler opening cap (1). Using flashlight, look into radiator (2). Check

for rust, dirt, and lubricating oil in coolant.

a. If coolant is clean, replace radiator filler cap (1).

b. If coolant contains rust and dirt, clean cooling system (page 2-351).

c. If coolant contains lubricating oil, replace radiator filler cap (1) and notify Direct Support

Maintenance.

Step 2.

Remove ENGINE WATER TEMP. indicator (page 2-545). Using soldering torch kit, 1-quart of

water In 1/2-gallon metal container, place bulb (3) in water. Heat water until it is boiling and check

temperature indicator (4) for reading near upper end of green operating range, about 2120F

(1000C).

a. If temperature indicator (4) reads properly, install ENGINE WATER TEMP. indicator (page 2-

545), go to step 3.

2-50