3. Troubleshooting
104
(I) Faulty fuel injection pump
(II) Faulty fuel injection valve
(III) Clogged intake air filter
(IV) Miscellaneous
No. Cause and effect Countermeasure
1 Faulty plunger operation. Check, repair or replace.
2 Worn plunger. Replace.
3 Faulty ejection valve. Check, repair or replace.
4 Uneven quantity of fuel injected. Adjust.
5 Irregular fuel injection timing. Adjust.
No. Cause and effect Countermeasure
1 Injection opening is clogged. Clean.
2 Sticking of valve needle. Check, repair or replace.
3 Low injection pressure. Adjust.
4 Faulty spry condition. Check, repair or replace.
5 Carbon deposit. Clean.
No. Cause and effect Countermeasure
1 Clogged filter. Clean.
No. Cause and effect Countermeasure
1 Overloading. Reduce load.
2 Too great a quantity of lube oil. Adjust quantity of oil.
3 Carbon deposit in suction valves. Clean.
4 Dirty air cooler. Clean.
5 Poor quality fuel oil. Replace with new oil.
6 Clogging in exhaust system Cause. Clean.
POOR EXHAUST COLOR
(I) Faulty fuel injection pump (III) Clogged intake air filter (IV) Miscellaneous(II) Faulty fuel injection valve
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