TRUCK SERVICE MANUAL
FUEL SYSTEM
Heat Shield
wheel cracks with dye penetrant. Cracks in the turbine
wheel render assembly unfit for further use.
Inspect heat shield for cracks, distortion and burned
condition, discard, If damaged. Cracks on bore of heat
shield less than 1/2 inch [12.7 mm] long are not cause for
replacement.
Oil Seal Plate/Diffuser Plate
1. Inspect oil seal/diffuser plate for cracks, burrs and
distortion, discard, If damaged.
2. Check oil seal/diffuser plate bore for burrs and
scoring. Fig. 10-17.
Fig. 10-18, T-431. Checking rotor thrust surface
Check shaft bearing journal diameters for wear. Fig. 10-
19. The turbine wheel and shaft may be reused if not
worn beyond limits given in Specifications If shaft is worn,
new shaft and turbine wheel assembly must be installed.
Fig. 10-17, T-524. Checking sealing ring bore in oil
seal/diffuser plate
Rotor Assembly The rotor assembly consists of turbine
wheel and shaft, sleeve, compressor wheel and locknut.
This is an accurately balanced assembly; therefore, if any
of the above parts exceed limits given in Specifications,
replace with new parts
Compressor Wheel
Compressor wheel cannot be reused, if vanes are
cracked, broken or have rubbed compressor casing.
Check for cracks with dye penetrant. If new compressor
wheel is required, rotor assembly does not have to be
Fig. 10-19, T-432. Measuring rotor shaft
balanced
Turbine Wheel And Shaft
Floating Bearing
Inspect sealing ring grooves for extensive damage.
Small grooves or marks are acceptable, but deep
1. Check bearing length for wear, chips and cracks. If
grooves are not. Smooth with polishing cloth before
dimension is worn less than limits shown in
reusing. Check turbine thrust shoulder for scoring. Fig
Specifications, bearing must be discarded.
10-18. Check for turbine
2. Measure O.D. and I.D. of bearings. Fig. 10-20. If
either diameter Is worn beyond limits shown in
Specifications, bearing must be discarded.
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