10.3.6. Diagnostics and troubleshooting
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Complaints
Possible causes
Corrections
1. Engine won’t start
•
Fuel pipes clogged or air into
Correct
1) Fuel not being pumped
pipe fine
out from feed pump
•
Feed pump valve defective
Replace
•
Feed pump piston or Push rod
Disassemble, correct
sticking
2) Fuel not being injected
•
Fuel filter element restricted
Clean
from injection pump
•
Air in fuel filter or injection
Bleed
pump
•
Plunger and/or delivery valve
Disassemble, correct
sticking or defective
3) Fuel injection timing
•
Injection pump not properly
Check, correct
Incorrect
installed on pump bracket
•
Injection pump tappet
Check, correct
incorrectly adjusted
•
Cams on cam shaft worn
Replace
excessively
4) Injection nozzles
•
Needle valves sticking
Correct or replace
inoperative
•
Fuel leaking past clearance
Correct or replace
between nozzle and needle
valve
•
injection pressure incorrect
Adjust
2. Engine starts but stalls
•
Pipe from feed pump to injection
Clean
immediately
pump clogged or filter clogged
•
Air in fuel
Bleed
•
Feed pump delivery insufficient
Disassemble, correct
•
Fuel delivery insufficient due to
Replace breather
clogging of fuel tank air breather
3. Engine lacks power
•
Plunger worn excessively
Replace
•
Injection timing incorrect
Adjust
•
Delivery valves defective
Replace
•
Nozzle leaks excessively
Correct or replace
•
Nozzle not working normally
Disassemble, correct
4. Engine knocking
•
Injection timing too fast
Adjust
•
Nozzle injection pressure too
Adjust
high
•
Nozzles not working normally
Disassemble, correct
5. Engine knocks seriously
•
Injection timing incorrect
Adjust
producing excessive
•
Nozzle injection pressure too low Adjust
exhaust smoke
•
Nozzle spring broken
Replace
•
Nozzles not working normally
Replace
•
Plungers worn excessively
Adjust
•
Delivery valves seat defective
Replace
•
Supply of fuel excessively
Check feed pump
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