ENGINE SMOKES BLACK

TM 10-3930-638-24&P

3-4. FUEL SYSTEM TROUBLESHOOTING (cont)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

7. ENGINE DOES NOT DEVELOP FULL POWER OR SPEED (cont)

Step 19. Check that hydraulic head screws are tight or are not missing (para 4-3b; notify general support

maintenance).

a. If hydraulic head screws are not tight or are missing, tighten and/or install (para 4-3b).

b. If hydraulic head screws are tight and not missing, proceed to step 20.

Step 20. Check rotor for scores (para 4-3b; notify general support maintenance).

a. If rotor is scored, replace it (para 4-3b).

b. If rotor is okay, proceed to step 21.

Step 21. Check delivery valve screw for tightness (para 4-3b notify general support maintenance).

a. If delivery valve screw is loose, tighten (para 4-3b).

b. lf delivery valve screw is tight, remove it. Then, remove delivery valve and inspect seat for erosion

1) If seat is eroded, replace delivery valve (para 4-3b).

2) If seat is okay, reinstall, tighten delivery valve screw (para 4-3b) and proceed to step 22.

Step 22. Check adjustment of torque screw (para 4-3b; notify general support maintenance).

a. If torque screw out of adjustment, adjust (para 4-3b).

b. If torque screw adjustment is okay, proceed to step 23.

Step 23. Check if hydraulic vent head wires are missing (para 4-3b; notify general support maintenance).

Install vent head wires (para 4-3b).

8. ENGINE SMOKES BLACK

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. Remove cam, shoes, and rollers and inspect for wear (para 4-3b; notify general support maintenance).