3. Troubleshooting
108
(I) Faulty fuel injection valve
(II) Faulty fuel injected
(III) Excessive quantity of fuel injected each time
(IV) Miscellaneous
No. Cause and effect Countermeasure
1 Low injection pressure. Increase injection pressure.
2 Damaged fuel valve spring. Replace.
3 Sticking of valve needle. Disassemble and lap.
4 Faulty injection spray. Disassemble and repair.
No. Cause and effect Countermeasure
1 Early fuel injection. Delay injection timing.
2 Fuel pressure is too high. Adjust standard injection pressure.
No. Cause and effect Countermeasure
1 Excessive quantity of fuel is ejected from fuel
pump.
Adjust pump adjustment rack.
No. Cause and effect Countermeasure
1 Insufficient coolant. Check cooling water pump and lap valves.
2 Excess piston clearance. Replace.
3 Excess bearing clearance. Replace.
4 Poor quality fuel oil. Replace with good fuel oil.
5 Water mixed in fuel oil. Replace with good fuel oil.
6 Incorrect pressure. Check and repair.
KNOCKING
(I) Faulty fuel injection valve (III) Excessive quantity of fuel
injected each time
(IV) Miscellaneous(II) Faulty fuel injected
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