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Group 25 Inlet and Exhaust System
Shaft & turbine wheel
Measure journal diam. of shaft & turbine wheel
If the measured diameter is less than the service limit,
replace the shaft & turbine wheel.
Shaft journal diameter, mm [in.]
Service Limit ............. 17.996 [0.70850]
Measure shaft deflection
1. Set a dial gauge at a location next to the thread-
ed section of the shaft, and measure shaft deflec-
tion. If the deviation indicated by the dial gauge
exceeds the service limit, replace the shaft & tur-
bine w heel.
IMPORTANT! If the shaft is bent, replace.
Do not attempt to correct the bend.
2. If the surface of the shaft journal is rough, mount
the shaft on a lathe, and gently polish the surface
using #400 sandpaper and engine oil while rotat-
ing at 300-600 min
-1
.
Shaft deflection, mm [in.]
Service Limit ............. 0.015 [0.00059]
Insert
Measure piston ring end gap
Install a new piston ring squarely in the insert then
measure the piston ring end gap. If the end gap devi-
ates from the assembly standard, replace the insert.
Ring end gap, mm [in.]
Assembly Standard ... 0.05–0.25 [0.00197–0.00984]
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