Unit Mechanical Troubleshooting

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

0010 00

Unit Mechanical Troubleshooting (Contd)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Step 6. Remove starter (WP 0091 00) and visually check starter drive and flexplate ring gear for

broken and missing teeth.

a. Replace starter if starter teeth are missing (WP 0091 00).

b. If flexplate ring gear is damaged, notify direct support maintenance.

c. Install starter (WP 0091 00) if vehicle evacuation is required.

END OF TESTING!

2. ENGINE CRANKS BUT WILL NOT START

Step 1. Check fuel level in fuel tanks.

Fill to proper level if necessary.

Step 2. Check starting system (Electrical Troubleshooting, WP 0011 00).

Step 3. Check air cleaner indicator.

a. If yellow appears at indicator window, inspect air intake tube for restrictions.

If restrictions are not present, replace air cleaner element (WP 0040 00).

b. Reset air cleaner indicator (WP 0041 00).

Step 4. Check for white exhaust smoke during cranking.

If white smoke can be seen:

a. Air may be in fuel system. Prime fuel system (TM 9-2320-386-10).

b. Coolant may be inside combustion chambers. Remove engine oil dipstick. If coolant is

present on dipstick, notify direct support maintenance.

AWARNINGA

Diesel fuel is flammable. Do not perform fuel system procedures near

open flame. Injury or death to personnel may result.

Compressed air source will not exceed 30 psi (207 kPa). When cleaning

with compressed air, eyeshields must be worn. Failure to wear eyeshields

may result in injury to personnel.

Step 5. Drain 1/2-pint (0.25-liter) of fuel from fuel/water separator. Check for contaminated fuel.

If water or contamination is present:

a. Drain and remove fuel tank (WP 0045 00).

b. Clean and flush entire fuel system. Dry with compressed air.

c. Replace fuel filter (WP 0054 00).

Step 6. Check for restricted fuel filter.

a. Disconnect fuel line from fuel filter to rear of cylinder head.

b. Crank engine. If no fuel is present, remove fuel filter (WP 0054 00) and check for dirt

and clogs. Replace fuel filter if dirty or clogged (WP 0054 00).

c. Crank engine. If no fuel is present, replace fuel/water separator (WP 0053 00).

Step 7. Check fuel supply line for restrictions or clogged or defective check valve on pick-up tube.

a. Disconnect fuel supply line from transfer pump and fuel tank.

b. Apply air pressure to the fuel supply line.

c. Remove pick-up tube and clean or replace check valve

d. Connect fuel supply line to transfer pump and fuel tank.

e. Prime fuel system (TM 9-2320-386-10).

f. Crank engine. If engine does not start, perform step 8.

0010 00-2