3. Troubleshooting
110
(IV) Faulty fuel injection valve
(V) Faulty fuel injection pump
(VI) Faulty fuel injection system
(VII) Leakage of pressurized air
(VIII) Miscellaneous
No. Cause and effect Countermeasure
1 Faulty valve seat. Lap.
2 Sticking of valve needle. Lap.
3 Worn valve needle. Replace.
4 Clogged outlet. Clean or replace.
5 Low injection pressure. Adjust.
No. Cause and effect Countermeasure
1 Worn plunger. Replace plunger and barrel as a unit.
2 Damaged plunger spring. Replace.
3 Plunger sticks. Disassemble and repair or replace.
4 Oil leakage from exhaust valve. Lap valves.
5 Air inside pump. Bleed air.
6 Damaged exhaust valve spring. Replace.
No. Cause and effect Countermeasure
1 Fuel injection pump timing irregular. Adjust.
2 Loose high pressure fuel pipe. Tighten firmly.
3 Damaged high pressure fuel pipe. Replace.
4 Air in high pressure fuel pipe. Bleed air.
No. Cause and effect Countermeasure
1 Air leakage from suction/exhaust valves. Lap valves.
2 No tappet clearance. Adjust.
3 Faulty gasket packing. Replace.
4 Upper part of cylinder liner worn. Replace.
5 Worn piston ring. Replace.
6 Piston ring sticks. Disassemble and repair or replace.
7 Insufficient tightening of head bolts. Tighten tightening nuts uniformly.
8 Damaged valve spring. Replace.
No. Cause and effect Countermeasure
1 Incorrect thickness of gasket packing. Replace.
2 Faulty installation of governor ring and lever. Adjust.
3 Governor handle is in stop position. Move governor handle to acceleration position.
4 Faulty engine starter. Check and repair.
5 Clogging of suction/exhaust pipes. Clean.
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