Mitsubishi 4DQ50 - Trouble Shooting Chart (Appendix)

2. TROUBLE SHOOTING CHART (APPENDIX)
Probable ClUte PossIble remedy
Improper fuel supply to fuel
Closed fuel tank supply coclc
Open the coclc.
injection pump
NO" fuel in tank Fill fuel tank.
Coged fuel lines
Repair or clean fuel pipes with air.
Ajr in fuel system
Retighten attaching parts
or replace
fuel pipes.
Coged fuel feed pump inlet
Remove and clean stamer.
strainer
Defective fuel feed pump Repair.
Leak in fuel lines or connections Retighten connections.
Cogged fuel filter
Disassemble and clean filter.
Ajr in fuel system Bleed air out of fuel system
Greater variance of injection
Jammed plungers Replace plungers.
quantity Jammed tappets Replace tappets.
Worn plungers
ReplaCe
plungers.
Worn tappet cams
Replace tappet cams.
Worn bearinp
Replace bearinp.
Worn or broken plunger sprinp
Replace plunger springs.
Loose pllmger pinions
Reinstall properly by matching
stamped marks.
Defective delivery valves
Replace
valves.
Worn or broken delivery valve
Replace valve spring.
springs
Insufficient injection quantity
Governor stop lever link is
Repair link properly, placing
binding.
lever in neutral position.
Control rack is sticky.
Relubricate or repair.
Jammed plungers
Replace plungers.
Jammed tappets
Replace tappets.
Worn plungers
Replace plungers.
Worn tappet cams
Replace
tappet cams.
Worn bearings
Replace bearinp.
Loose plunger pinions
Reinstall properly by matching
stamped marks.
Improper
full-load setting of
Adjust governor setting on
governor
bench.
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