ENGINE HARD TO START - TM-10-3930-638-24-P0513

TM 10-3930-638-24&P

3-4. FUEL SYSTEM TROUBLESHOOTING (cont)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

3. ENGINE HARD TO START

Step 1. Check fuel injection pump timing (para 3-5a(3)).

a. If fuel injection pump timing is not correct, adjust timing as described in paragraph 3-5a(3).

b. If fuel injection pump timing is okay, proceed to step 2.

Step 2. Disconnect fuel lines from fuel injection pump at fuel injectors (para 3-6a) one at a time, crank engine

and check that fuel is pumped out of disconnected line.

If fuel is not pumped out of any one disconnected line when engine is cranked, replace associated

connector screw (para 4-3b; notify general support maintenance). If fuel is not pumped out of

any line when disconnected, replace/ clean inlet strainer (para 4-3b; notify general support

maintenance).

b . If fuel is cranked out of all lines when disconnected, proceed to step 3.

Step 3. Disassemble fuel injection pump and check transfer pump blades for wear or damage (para 4-3b notify

general support maintenance).

a. If transfer pump blades are worn or damaged, replace (para 4-3b).

b. If transfer pump blades check okay, proceed to step 4.

Step 4. Disassemble fuel injection pump and check transfer pump parts for wear or damage (para 4-3b;

notify general support maintenance).

a. If transfer pump parts are worn or damaged, replace (para 4-3 b).

b. If transfer pump parts check okay, proceed to step 5.

Step 5. Disassemble fuel injection pump and check end plate regulating piston and sleeve and inspect for burrs,

corrosion, or varnishes (para 4-3b; notify general support maintenance).

a. If regulating piston and sleeve are burred, corroded, or varnish accumulation present, replace

b. If regulating piston and sleeve check okay, proceed to step 6.

Step 6. Disassemble fuel injection pump and check governor linkage for binding, foreign matter, and burrs;

check metering valve for sticking condition (para 4-3b; notify general support maintenance).

a. If linkage is binding or burred, replace (para 4-3b); if foreign matter is present, remove; if

metering valve is sticking, replace (para 4-3b).

b. If linkage and metering valve check okay and no foreign matter present, proceed to step 7.

Step 7. Check governor linkage for proper adjustment (para 4-3b; notify general support maintenance).

a. Adjust governor linkage (para 4-3b).

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