Yanmar 4LHA-HTP Operation Manual page 501

Chapter 4 Intake and Exhaust System
4. Turbocharger
<lnfluence of exhaust resistance >
Possible cause
1) Exhaust gas leak before the turbocharger
to decrease its speed
2) Since exhaust piping is deformed or
clogged, turbocharger speed does not
increase.
4 - 9 - 2 White exhaust gas color
Possible cause
1) Oil flows to the compressor or turbine
side due to clogged oil return pipe.
2) Abnormal wear or breakage of seal ring
by excessive wear of bearing
4 - 9 - 3 Excessive engine oil consumption
Possible cause
1) Abnormal wear or breakage of seal ring
by excessive wear of bearing
4 - 9 - 4 Engine output drop
Possible cause
1) Gas leak at exhaust system
2) Air leak from discharge side of
compressor
3) Clogged air cleaner element
4) Dirty or damaged turbocharger
4 - 9 - 5 Poor (slow) response (starting) of turbocharger
Possible cause
1) Hard carbon deposit on the turbine side
(wheel sealing) to hamper turbine shaft
smooth rotation
2) Incomplete combustion
•
• Check the mounting portions and repair as
• Repair the pipe to the normal operating
• Repair or replace the piping.
• Disassemble and repair the turbocharger.
• Disassemble and repair the turbocharger.
• Check for faulty part and repair.
• Wash or replace the element.
• Disassemble and repair or replace the
• Replace engine oil and wash the
• Check the engine combustion system and
4-24
Corrective action
needed.
condition.
Corrective action
Corrective action
Corrective action
turbocharger.
Corrective action
turbocharger after disassembly.
take corrective action to obtain good
combustion.
4LHA Seriei