ENGINE STARTS AND STOPS

TM 10-3930-638-24&P

3-4. FUEL SYSTEM TROUBLESHOOTING (cont)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

4. ENGINE STARTS AND STOPS (cont)

Step 3. (cont)

a. If cracks, swelling or loose screw terminals are observed, replace solenoid frame and arm

assembly (para 4-3 b); if continuity not obtained, replace solenoid frame and arm assembly

b . If solenoid frame and arm assembly checks okay, proceed to step 4.

Step 4. 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 5.

Step 5. 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 4-3b).

b. If transfer pump parts check okay, proceed to step 6.

Step 6. Disassemble fuel injection pump and check cam roller shoes for burrs; also check for freedom of

rotation, chipping, and abrasive wear patterns (para 4-3b; notify general support maintenance).

a. Replace cam roller shoes if burred, sticking, chipped, or abrasive wear pattern observed

b. If cam roller shoes check okay, proceed to step 7.

Step 7. Remove plungers and inspect for burrs, corrosion, or varnishes (para 4-3b; notify general support

maintenance).

If plungers are burred, corroded, or varnish accumulation is present, replace (para 4-3b).

5. ERRATIC ENGINE OPERATION (SURGE, MISFIRING, POOR GOVERNOR REGULATION)

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 para 3-5a(3).

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

Step 2. Remove inlet strainer and check for clogged condition (para 4-3b; notify general support maintenance).

a. If inlet strainer is clogged, either clean or replace strainer (para 4-3b).

b. If inlet strainer is not clogged, proceed to step 3.