Yanmar 4LHA-HTP Operation Manual page 491

Chapter 4 Intake and Exhaust System
4. Turbocharger
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
Carbon deposits
Lubrication status
(wear, seizure,
discoloration, etc.)
Oil leakage
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
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®
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
Position to be checked
4LHA Series