Yanmar 6LPA-STP2 Service Manual page 316

TROUBLESHOOTING
Symptom
Abnormal vibration
Noise
Quick contamination of
lubrication oil
Pulsation of intake air
pressure
Other
Other malfunctions:
Noise generation
12-10
Probable Cause
Broken turbine impeller
Broken compressor impeller
Deposit of carbon or oxides on turbine
Broken bearing
Bent turbine shaft
Loose parts or fasteners
Damaged bearing
Contact by revolving parts
Dirty or carbon deposit on turbine and compressor
Entrapment of foreign matter (at turbine entrance)
Rapid change in load (surging)
Gas trapped in bearing housing
Clogged seal air path
Damaged seal ring
Clogged pressure balance path
Uneven cylinder combustion
Rapid change in load
Excessively dirty compressor side
Intake temperature too high
Bearing seizure
Water leak from exhaust opening
Corrosion in compressor / turbine impeller or bearing housing Increase the coolant
Loose flywheel set bolts
Loose connecting rod bolts
Worn crank pin
Excessive gear backlash
© 2007 Yanmar Marine International
Troubleshooting Chart
Measure
Replace
Replace
Remove and repair or replace
Replace
Replace
Tighten
Replace
Repair or replace
Clean
Repair or replace
Stabilize the load or replace
turbine nozzle
Repair
Clean
Replace
Clean
Adjust for uniform combustion
Operate correctly
Clean
Clean cooling fin
Complete thermal insulation
of exhaust pipe
Ensure intake air path is
unrestricted from outside air
Replace
Replace
temperature
Tighten bolts
Tighten bolts
Replace
Inspect the gear; replace
worn gear, shaft, and/or
bushing with new ones
6LPA Service Manual