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