Inspecting The Turbocharger Components - Yanmar 6LY3 series Service Manual

TURBOCHARGER
Inspecting the Turbocharger
Components
Compressor Housing
Inspect the compressor housing surface for any
scratches, nicks or cracks which may be caused by
contact with the compressor impeller. If any defect
is found, replace the compressor housing.
Turbine Housing
Inspect the turbine housing surface for any
scratches caused by contact with the turbine rotor,
oxidation, thermal deformation or cracks. If any
defect is found, replace the turbine housing.
Compressor Impeller
Inspect the impeller for any scratches or evidence
of interference. If any defect is found, replace the
compressor impeller.
Turbine Rotor Shaft
1. Inspect the turbine rotor for any scratches,
interference with the housing, surface defects,
bearing flaws, thermal distortion and / or
discoloration. Replace the turbine rotor shaft
assembly as a unit if any damage is found.
2. Measure the outer diameter of the turbine rotor
shaft bearing (Figure 9-6, (1)).
Turbine Shaft Journal
Outside Diameter
Limit: 12.28 mm (0.483 in.)
Figure 9-6
Figure 9-6
1 – Turbine Shaft Journal Outside Diameter
2 – Seal Ring Groove Width
3 – V-Block
9-16
(2)
E
(1)
A
(3)
0006246
© 2007 Yanmar Marine International
Inspecting the Turbocharger
3. Measure the seal ring groove width and the
turbine rotor shaft for runout. If it exceeds 0.011
mm (0.0004 in.), replace the rotor shaft
(Figure 9-6, (2)).
Seal Ring Groove Width
Limit: 1.63 mm (0.064 in.)
Turbine Rotor Shaft Runout
Limit: 0.011 mm
(0.0004 in.)
NOTICE: If any value is beyond the specified
limits, replace the turbine rotor shaft assembly as
a unit.
4. Inspect the turbine housing inside surface for
signs of interference, discoloration, corrosion or
cracks. If any defect is found, replace the
turbine housing.
Thrust Bearing and Oil Thrower
1. Inspect the overall part for scratches and / or
discoloration. If any damage is found, replace
the component.
2. Measure the width of the seal ring groove at K
(Figure 9-7).
Thrust Bearing Seal Ring Groove
Limit: 4.68 mm (0.184 in.)
Figure 9-7
(1)
K
Figure 9-7
1 – Thrust Bearing
2 – Oil Thrower
6LY3 Service Manual
G1
G2
(2)
0006247