TROUBLESHOOTING
140
JH Series Operation Manual
Breakdown of turbo-charger (If equipped)
Drop in intake pressure
Dirty air cleaner
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 cleaner
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
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