
TROUBLESHOOTING
86 JH Series Operation Manual
Breakdown of turbo-charger (If equipped)
Drop in intake pressure Dirty air filter Clean
Leak from intake piping Repair
Leak of exhaust gas Repair
High intake air temperature Complete thermal insulation of exhaust pipe
Ensure intake air path is unrestricted from outside air
Clean air filter
Drop in air pressure in engine room Ensure intake air path is unrestricted from outside air
Broken turbine impeller Replace
Dirty turbine impeller Clean
Clogged exhaust pipe Clean
Abnormal vibration Broken turbine impeller Replace
Broken compressor impeller Replace
Deposit of carbon or oxides on turbine Remove and repair or replace
Broken bearing Replace
Bent turbine shaft Replace
Loose parts or fasteners Tighten
Noise Damaged bearing Replace
Contact by revolving parts Repair or replace
Dirty or carbon deposit on turbine and
compressor
Clean
Entrapment of foreign matter (at
turbine entrance)
Repair or replace
Rapid change in load (surging) Stabilize the load or replace turbine nozzle
Quick contamination of engine
oil
Gas trapped in bearing housing Repair
Clogged seal air path Clean
Damaged seal ring Replace
Clogged pressure balance path Clean
Pulsation of intake air pressure Uneven cylinder combustion Adjust for uniform combustion
Rapid change in load Operate correctly
Excessively dirty compressor side Clean
Intake temperature too high Clean cooling fin
Complete thermal insulation of exhaust pipe
Ensure intake air path is unrestricted from outside air
Other Bearing seizure Replace
Corrosion in compressor/turbine
impeller or bearing housing
Increase the coolant temperature
Other malfunctions
Noise generation Loose flywheel set bolts Tighten bolts
Loose connecting rod bolts Tighten bolts
Worn crank pin Replace
Excessive gear backlash Inspect the gear; replace worn gear, shaft, and/or
bushing with new ones
Symptom Probable Cause Measure
4JH45_4JH57_4JH80_4JH110_EN_OPM.book 86 ページ 2013年10月8日 火曜日 午後3時58分
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