ENGINE TROUBLESHOOTING

10-3930-638-24&P

2-9. ENGINE TROUBLESHOOTING (cont)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

3. ENGINE STARTS BUT WILL NOT RUN (cont)

WARNING

If NBC exposure is suspected, all air filter media should be handled by

personnel wearing protective equipment. Consult your unit NBC Of-

ficer or NBC NCO for appropriate handling or disposal procedures

Step 3. Check for air in fuel system.

a. Place ignition switch in on position. Open bleed valve

plug on top of secondary fuel filter allowing air to

bleed out of both filters. When fuel, free of bubbles,

starts to flow, close bleed valve plug and wipe parts

free of fuel. Turn ignition switch off

b. If no air in fuel system, proceed to step 4 below.

Step 4. Check for clogged fuel filters by disconnecting fuel line between fuel filter head and fuel injection pump at

fuel injection pump. Place ignition switch in ON position and crank engine. Fuel should be pumped out of

disconnected line.

a. If fuel is not pumped out of disconnected line, reconnect fuel line and service fuel filters (para

215e and 215f).

b. If fuel is pumped out of disconnected line reconnect line and proceed to step 5 below.

Step 5. Check for incorrect or contaminated fuel in fuel tank (if contaminated, fuel will have a milky white color-

ing).

a. If fuel is contaminated, drain fuel tank, clean fill with correct fuel (para 2-1 5d (1)) and replace

fuel filters (para 215e and 2-15f).

(Refer to current lubrication order for correct fuel.)

b. If fuel is not contaminated, proceed to step 6 below.

Step 6. Check throttle cable movement as an assistant depresses and releases accelerator.

a. If movement is not observed, repair or replace throttle/accelerator pedal linkage (pars 2- 15i)

b. If movement is observed, proceed to step 7 below.

Step 7. Disconnect wire at fuel injection pump terminal. With ignition switch in ON position, check for +24 Vdc

between wire and chassis ground.

a. If +24 Vdc is obtained, reconnect wire to terminal

and crack (open) a fuel injector line at fuel injector

pump Crank engine and check if fuel is pumped

through fuel injection pump.

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