Yanmar 6LPA-STP2 Service Manual page 267

Turbocharger
12/05
Possible Cause
1. Abnormal wear or breakage of seal ring by excessive wear of
bearing
Possible Cause
1. Exhaust gas leak
2. Air leak from discharge side of compressor
3. Clogged air cleaner element
4. Dirty or damaged turbocharger
Possible Cause
1. Hard carbon deposits on the turbine side (wheel sealing)
preventing smooth turbine shaft rotation
2. Incomplete combustion
Possible Cause
1. Restricted exhaust gas path caused from a clogged nozzle in
turbine housing or reverse flow of blower discharge during
acceleration (generally called surging)
2. Rotating parts contacting
Possible Cause
1. Loose intake, exhaust or oil pipe connection to the
turbocharger
2. Damage on the turbine wheel or compressor impeller caused
by contact between rotating parts and adjacent parts due to
damaged bearings or ingestion of foreign debris
3. Unbalanced rotating part
6LPA Service Manual
Excessive Engine Oil Consumption
Disassemble and repair the turbocharger.
Engine Output Drop
Check connections and repair.
Wash or replace the element.
Disassemble and repair or replace the turbocharger.
Poor (slow) Response (starting) of Turbocharger
Replace engine oil and wash the turbocharger after
disassembly.
Check the engine combustion system and take corrective action
if needed to restore performance.
Abnormal Sound
Disassemble and wash the turbocharger.
Disassemble and repair or replace the turbocharger.
Abnormal Vibration
Check pipe connections of the turbocharger and repair as
needed.
Disassemble and repair or replace the turbocharger. If foreign
debris is present completely remove it.
Repair or replace the rotating part.
© 2007 Yanmar Marine International
TURBOCHARGER
Corrective Action
Corrective Action
Corrective Action
Corrective Action
Corrective Action
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