Yanmar 8LV320 Operation Manual page 69

Symptom
Breakdown of turbo-charger
Drop in intake pressure Dirty air filter
Increased intake
pressure
Abnormal vibration
Noise
Quick contamination of
engine oil
8LV Series Operation Manual
Probable Cause
Leak from intake piping
Leak of exhaust gas
High intake air temperature
Drop in air pressure in engine room
Broken seal ring
Broken turbine impeller
Broken nozzle ring
Dirty turbine impeller
Clogged nozzle
Clogged exhaust pipe
Exhaust gas leak
Failure in fuel injection system
Deformed turbine nozzle
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
TROUBLESHOOTING
Measure
Clean
Repair
Repair
Complete thermal insulation of
exhaust pipe
Ensure intake air path is unrestricted
from outside air
Clean air filter
Ensure intake air path is unrestricted
from outside air
Replace
Replace
Replace
Clean
Clean
Clean
Re-mount turbo-charger
Overhaul injection pump, repair or
replace any defective parts
Disassemble and inspect injection
valve, replace injection valve
Replace
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
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