D1146/D1146TI/DE08TIS
MAINTENANCE MANUAL
120
Printed in Jan. 2001 PS-MMA0415-E1A
4.3.6. Diagnostics and troubleshooting
Complaints Possible causes Corrections
1. Engine won't start
① Fuel pipes clogged or air into
pipe fine
Correct
② Feed pump valve defective
Replace
1) Fuel not being pumped
out from feed pump
③ Feed pump piston or Push rod
sticking
Disassemble, correct
① Fuel filter element restricted
Clean
② Air in fuel filter or injection
pump
Bleed
2) Fuel not being injected
from injection pump
③ Plunger and/or delivery valve
sticking or defective
Disassemble, correct
① Injection pump not properly
installed on pump bracket
Check, correct
② Injection pump tappet
incorrectly adjusted
Check, correct
3) Fuel injection timing
Incorrect
③ Cams on cam shaft worn
excessively
Replace
① Needle valves sticking
Correct or replace
② Fuel leaking past clearance
between nozzle and needle
valve
Correct or replace
4) Injection nozzles
inoperative
③ injection pressure incorrect
Adjust
① Pipe from feed pump to
injection pump clogged or filter
clogged
Clean
② Air in fuel
Bleed
③ Feed pump delivery insufficient
Disassemble, correct
2. Engine starts but stalls
immediately
④ Fuel delivery insufficient due to
clogging of fuel tank air
breather
Replace breather
① Plunger worn excessively
Replace
② Injection timing incorrect
Adjust
③ Delivery valves defective
Replace
④ Nozzle leaks excessively
Correct or replace
3. Engine lacks power
⑤ Nozzle not working normally
Disassemble, correct
① Injection timing too fast
Adjust
② Nozzle injection pressure too
high
Adjust
4. Engine knocking
③ Nozzles not working normally
Disassemble, correct
① Injection timing incorrect
Adjust
② Nozzle injection pressure too
low
Adjust
③ Nozzle spring broken
Replace
④ Nozzles not working normally
Replace
⑤ Plungers worn excessively
Adjust
⑥ Delivery valves seat defective
Replace
5. Engine knocks seriously
producing excessive
exhaust smoke
⑦ Supply of fuel excessively
Check feed pump
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