Service manual

FUEL SYSTEM TROUBLESHOOTING
PROBLEM
PROBABLE CAUSE VERIFICATION/REMEDY
Engine output and
performance poor.
1. Contaminated or inferior fuel.
1. Purge fuel system and replace with quality fuel.
2. Fuel filter obstructed.
2. Remove and replace filter element.
3. Air in fuel system.
3. Bleed and check for source.
4. Injection pump timing incorrect.
4. Check the timing and adjust pump as needed.
5. Injector high pressure lines leaking.
5. Loosen and then retighten injector line attachment
nut or replace the complete line.
6. Injectors not operating properly.
6. Remove injectors and adjust spray pressure to proper set-
ting.
7. Shaft stuffing box too tight.
7. Check shaft free movement and for heat.
8. Valves improperly adjusted. 8. Check valve adjustment and maintain.
Large amount of
black exhaust smoke.
1. Clogged fuel filter. 1. Replace the fuel filter and bleed the system.
2. Restricted air intake. 2. Remove air obstruction.
3. Engine overloaded.
3. Check engine propeller size and engine
performance no load through fully loaded.
4. Injection timing.
4. Check the injection pump timing and adjust as needed.
5. Fuel injectors not operating properly. 5. Check nozzle spray pressure.setting.
Abnormal noise from engine
1. Poor quality and/or incorrect fuel. 1. Use No.2 diesel fuel.
2. Incorrect injection timing. Timing too advanced.
2. Check injection timing.
3. Fuel injector stuck open.
3. Locate and remove faulty injector. Replace or rebuild.
Engines & Generators
37