3.
Tr
ou
bleshooting
57
TROUBLE AND TROUBLESHOOTING
Cause and Ef
fect
Countermeasure
(IV-1) Lap valves.
(IV-2) Adjust.
(IV-3) Replace.
(IV-4) Replace.
(IV-5) Disassemble and repair or replace.
(V-1) Adjust timing to
delay injection.
(V-2) Adjust timing to
speed injection.
(VI-1) Clean.
(VII-1) Replace with good fuel oil.
(VII-2) Clean.
(VII-3) Disassemble, check and repair.
(VII-4) Lap cooling water pump suction/exhaust valves.
(VII-5) Disassemble and clean lube oil pump and filter.
Countermeasure
INSUFFICIENT POWER OUTPUT
Chart 8
(I-1) Replace.
(I-2) Disassemble and repair or replace.
(I-3) Lap valves.
(I-4) Tighten firmly.
(I-5) (I-6) Adjust.
(I-7) (I-8) Clean.
(I-9) Replace.
(I-10) Repair.
(II-1) Clean nozzle hole or replace.
(II-2) Lap or replace.
(II-3) Lap or replace.
(II-4) Tighten firmly.
(II-5) Replace.
(II-6) lean.
(III-1) Replace.
(III-2) Repair.
(1) Leakage of gas from
suction/exhaust valves
(2) Inadequate tapper
clearance
(IV) Leakage of pressurized gas from inside cylinder
(3) Worn upper part
of cylinder liner
(4) Worn piston ring
(5) Sticking of piston ring
INSUFFICIENT
POWER OUTPUT
(I) Amount of oil supply from fuel injection pump inadequate
(1) Worn plunger
(6) Inaccurate positioning
of adjustment rack
(7) Clogging of fuel filter
(8) Clogging of fuel oil pipe
(9) Damaged valve spring
(10) Faulty supply pump
(2) Sticking of plunger
(3) Oil leakage from exhaust valve
(5) Faulty adjustment of fuel pump
(4) Oil leakage from joint of
high pressure pipe
(III) Faulty governor
(1) Damaged governor bearing
(2) Inaccurate length
of governor link
(II) Amount of fuel injection inadequate
(1) Clogging of nozzle hole
(2) Faulty valve seat
(3) Sticking of valve needle
(4) Loose high pressure pipe
(5) Worn valve needle
(6) Clogging of filter
(VII) Miscellaneous
(1) Poor quality fuel oil
(2) Clogging of exhaust line
(3) Seizure of moving parts
(5) Insufficient lube oil supplied
(4) Insufficient cooling water
(VI) Clogged intake air filter
(1) Clogging of air filter
(V) Irregular fuel injection timing
(1) Early injection
(2) Late injection
