Yanmar 4LHA-HTP Operation Manual page 489

Chapter 4 Intake and Exhaust System
4. Turbocharger
4 - 5 - 2 Inspection before disassembly
(1) Check the turbine wheel and compressor
impellers for interference with their housings.
Also, check that the turbine shaft rotates smoothly.
(2) Measure the turbine shaft play
(See 3.8.4.2.2
1) Turbine shaft axial play
Wear limit: 0.110 mm
2) Turbine shaft radial play
Wear limit: 0.205 mm
4 - 5 - 3 Disassembly
- [NOTICE]
As mounting angles of the turbine housing,
bearing housing and compressor housing of
the turbocharger are determined according to
their mounting status on the engine, put match
marks before beginning disassembly.
(1) Remove the boost hose
1) Move the hose clip @ to the center of boost hose
%
2) Disconnect boost hose % from compressor
housing® and waste gate actuator®.
(2) Remove the compressor housing
1) Remove the M8 TORX T screw bolt ® using the
torque wrench (TT40).
2) Remove compressor housing®.
N o t e l : The liquid gasket is applied to the
compressor housing ® and seal plate (n)
mounting surfaces.
Note 2: Pay attention % as not to damage the
compressor impellers when disassem-
bling the compressor housing.
(3) Remove the compressor impeller
1) Attach the box spanner (14 mm) to the shaft end
of turbine shaft (D on the turbine side and remove
the shaft end nut Q).
p- [NOTICE]
Pay attention to the loosening direction as the
shaft end nut has left-handed thread.
2) Remove compressor impeller © .
Inspection of turbine shaft play)
4-12
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