Yanmar 4LHA-HTP User Manual

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

Yanmar 4LHA-HTP Specifications

General

Brand	Yanmar
Model	4LHA-HTP
Category	Engine
Language	English