Yanmar 6LPA-STP2 Service Manual page 261

Turbocharger
12/05
Component Inspection
Compressor Housing
Check the compressor housing (Figure 9-2, (31))
for any contact traces with the compressor impeller,
damage, dents or cracks at the mating surfaces.
Replace the housing if necessary.
Turbine Housing
Check for any damage or contact traces with the
turbine wheel, damage from corrosion to the case
surface, thermal deformation or cracks. Replace
the turbine housing (Figure 9-2, (41)) if necessary.
Compressor Impeller
Check for any damage, contact traces, chipping,
corrosion or deformation. Replace the compressor
impeller (Figure 9-2, (8)) if necessary.
Turbine Shaft
1. Check for any damage, contact traces,
chipping, thermal discoloration or deformation
at the turbine wheel. Check the turbine shaft
(Figure 9-2, (1)) for straightness, the journal for
thermal discoloration or abnormal wear, and the
seal ring groove for surface defect or wear.
Replace the turbine shaft if necessary.
2. Measure the outside diameter (Figure 9-3, (A))
and seal ring groove width (Figure 9-3, (E)) of
the turbine shaft journal. Replace the turbine
shaft if measurements are beyond the wear
limit.
• Wear limit of journal outside diameter
(Figure 9-3, (A)) is 11.38 mm (0.448 in.)
• Wear limit of seal ring groove width
(Figure 9-3, (E)) is 1.33 mm (0.052 in.)
3. Measure the runout of the turbine shaft.
Replace the turbine shaft if the measured
runout exceeds 0.011 mm (0.0004 in.).
Thermal Insulation Plate
Check the thermal insulation plate
(Figure 9-2, (42)) for damage, contact traces,
thermal deformation or corrosion. Replace the
thermal insulation plate if necessary.
6LPA Service Manual
Thrust Bushing, Oil Thrower and Thrust
Bearing
Check each part for damage, wear, surface defects
and discoloration. Replace the component if
needed, even if dimensions (Figure 9-6, (G)) and
(Figure 9-6, (K)) are within the wear limit.
1. Thrust Bushing (Figure 9-2, (2))
Measure the seal ring groove width
(Figure 9-6, (K)) of the thrust busing. Replace
the thrust bushing if the measured value
exceeds the wear limit.
• Wear limit: 4.48 mm (0.176 in.)
2. Oil Thrower (Figure 9-2, (3))
Measure the seal ring groove width
(Figure 9-6, (G)). Replace with a new one if the
measured value exceeds the wear limit.
• Wear limit: 1.52 mm (0.059 in.)
3. Thrust Bearing (Figure 9-2, (22))
Measure the thrust bearing width
(Figure 9-3, (J)). Replace with a new one if the
measured value exceeds the wear limit.
• Wear limit: 4.28 mm (0.168 in.)
Figure 9-6
Floating Bearing
1. Check the floating bearing (Figure 9-2, (21)) for
damage, abnormal wear, discoloration or
surface defects. Replace the floating bearing if
necessary.
© 2007 Yanmar Marine International
TURBOCHARGER
(1)
K
Figure 9-6
G
(2)
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9-15