Yanmar 4LHA-DTP User Manual

Chapter 4 Intake and Exhaust System
4. Turbocharger
4LHA Series
4 - 6 Cleaning and Checking Procedures
4-6-1 Cleaning
(1) Checking before cleaning
Before cleaning, visually check each part for any trace of seizure, wear, foreign matter or carbon
deposits. When parts are disassembled because of any trouble, carefully check for identifying the
cause of trouble at this stage.
<Major checking items>
Check item
Position to be checked
Carbon deposits
1) Turbine side seal ring of turbine shaft © and turbine wheel
backside
2) Mounting portions for bearing housing© and thermal insulation
plate @ and inner wall of bearing housing
Lubrication status
(wear, seizure,
discoloration, etc.)
1) Journal of turbine shaftCD thrust bushing (2) and oil thrower @
2) Floating bearing® and thrust bearing@
3) Internal circumference of bearing case of bearing housing®
Oil leakage
1) Inner wall of turbine housing®
2) Outer surface of bearing housing® and thermal insulation
plate ©mounting area
3) Turbine side seal ring © of turbine shaft ® and turbine wheel
backside
4) Inner wall of compressor housing®
5) Backside of compressor impeller ®
6) Surface of seal plate © and seal ring © inserting area
4-14

Yanmar 4LHA-DTP Specifications

General

Brand	Yanmar
Model	4LHA-DTP
Category	Engine
Language	English