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TM 10-3930-638-24&P
3-4. FUEL SYSTEM TROUBLESHOOTING (cont)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
8. ENGINE SMOKES BLACK (cont)
Step 3. (cont)
a. If cam, shoes, or rollers are worn, replace (para 4-3b).
b. If cam, shoes, and rollers are okay, adjust torque screw (para 4-3b).
9. ENGINE SMOKES BLUE OR WHITE
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. Disassemble automatic advance components and inspect (para 4-3b; notify general support
maintenance).
a. If automatic advance components are worn or damaged, replace and adjust (para 4-3b).
b. If automatic advance components are okay, proceed to step 3.
Step 3. Check rotor for scores (para 4-3b; notify general support maintenance).
Replace rotor (para 4-3b).
10. FUEL NOT REACHING FUEL INJECTION PUMP
Step 1. Disassemble fuel injection pump and check for cause of seizure of rotor assembly (para 4-3b; notify
general support maintenance).
a. Replace hydraulic head and rotor assembly (para 4-3b).
a. If hydraulic head and rotor assembly are 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 strainer is not clogged, proceed to step 3.
Step 3. Disassemble transfer pump and check that transfer pump liner locating pin is in correct hole (para 4-3b;
notify general support maintenance).
a. If locating pin is in wrong hole, remove and install in correct hole (para 4-3b).
b. If locating pin is in correct hole, 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 4-3b).
b. If transfer pump parts check okay, replace end plate regulating piston and sleeve (para 4-3b).
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