3. Troubleshooting
111
(I) Amount of oil supply from fuel injection pump inadequate
(II) Amount of fuel injection inadequate
(III) Faulty governor
No. Cause and effect Countermeasure
1 Worn plunger. Replace.
2 Sticking of plunger. Disassemble and repair or replace.
3 Oil leakage from exhaust valve. Lap valves.
4 Oil leakage from joint of high pressure pipe. Tighten firmly.
5 Faulty adjustment of fuel pump. Adjust.
6 Inaccurate positioning of adjustment rack. Adjust.
7 Clogging of fuel filter. Clean.
8 Clogging of fuel oil pipe. Clean.
9 Damaged valve spring. Replace.
10 Faulty supply pump. Repair.
No. Cause and effect Countermeasure
1 Clogging of nozzle hole. Clean nozzle hole or replace.
2 Faulty valve seat. Lap or replace.
3 Sticking of valve needle. Lap or replace.
4 Loose high pressure pipe. Tighten firmly.
5 Worn valve needle. Replace.
6 Clogging of filter. Clean.
No. Cause and effect Countermeasure
1 Damaged governor bearing. Replace.
2 Inaccurate length of governor link. Repair.
INSUFFICIENT POWER OUTPUT
(I) Amount of oil supply from fuel
injection pump inadequate
(III) Faulty governor (IV) Leakage of pressurized
gas from inside cylinder
(II) Amount of fuel injection
inadequate
(V) Irregular fuel
injection timing
(VII) Miscellaneous(VI) Clogged intake
air filter
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