TROUBLESHOOTING
JH Series Operation Manual 139
Insufficient output
Insufficient fuel injection Oil leak from fuel injection pipe joint Tighten
Clogged fuel filter Replace
Clogged fuel pipe Clean
Failure of fuel supply pump Repair
Insufficient injection by fuel
injection nozzle
Clogged injection hole Replace
Faulty valve seat Replace
Sticking nozzle Replace
Loose fuel injection pipe joint Tighten
Worn nozzle Replace
Compressed gas leak in the
engine cylinder
Gas leak from intake/exhaust valve Conduct fitting of the valve
Worn upper portion of cylinder bore Lap or replace
Worn piston ring Replace
Sticking piston ring Overhaul or replace
Turbo-charger failure
(If equipped)
Clogged air cleaner Clean
Dirty compressor side Clean
Clogged turbine nozzle Clean
Damaged bearing Replace
Other Improper fuel Replace with correct fuel
Clogged exhaust duct Clean
Seized or overheated moving parts Disassemble and conduct servicing
Insufficient seawater Inspect seawater pump
Insufficient feed of engine oil Disassemble and clean engine oil pump and filter
Controller defects system error Inspect DTC and conduct servicing
Knocking
Failure of fuel injector Broken fuel valve spring Replace
Sticking nozzle Replace
Poor atomization Replace
Other Insufficient seawater Replace seawater pump impeller
Piston clearance excessive Replace
Bearing clearance excessive Replace
Improper fuel Replace with correct fuel
Water trapped in fuel Replace fuel
Poor compression Inspect and service
Symptom Probable Cause Measure
3JH40_4JH45_4JH57_4JH80_4JH110_EN_OPM.book 139 ページ ２０２２年９月２２日 木曜日 午後６時１７分
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