Unusual Sound Or Vibration - Yanmar 6LY3 series Service Manual

Troubleshooting the Turbocharger
12/05

Unusual Sound or Vibration

Abnormal Sound
Possible Cause
If the gas passage gets too narrow because of nozzle blockage
in the turbine housing or gas flow speed is too fast, air
discharged from the compressor is blocked and it flows in
reverse. (This phenomenon is generally called surging.)
Rotating part is obstructed.
Interference of rotating part(s).
Abnormal Vibration
Possible Cause
Connection between the turbocharger and the suction or
exhaust pipe or oil pipe is loosened.
Turbine rotor shaft or compressor impeller is broken because of
bearing failure, rotating part interference or entry of foreign
matter.
Imbalance in rotating part(s).
6LY3 Service Manual
Disassemble and clean the turbocharger.
Disassemble, repair or replace the turbocharger.
Check installation state of the turbocharger and repair any loose
parts.
Disassemble, repair or replace the turbocharger. Clear debris
from the turbocharger.
Repair or replace the rotating part(s).
© 2007 Yanmar Marine International
TURBOCHARGER
Correction
Correction
9-25