Volvo Penta TAD1630G Workshop Manual page 119

Group 22
3 Shaft and wheel assembly
Soak in solvent to remove oily residue. Mask entire shaft
section and totally clean wheel and hub using steam. Avoid
concentrating on piston ring seal groove.
Inspection of parts
1 Bearing Housing
Inspect bearing bore visually for sign of damage or wear.
Check turbine end seal bore for damage.
2 Compressor Wheel (1)
Visually inspect for evidence of bent, burred, nicked or erod-
ed blades, and for evidence of scuffing on the back face.
Very minor damage is acceptable. Reject and replace if
damage appears sufficient to affect wheel balance. Do not
attempt to straighten any bent blades.
3 Shaft and wheel assembly
Check journal diameter for wear. Minimum diameter is 15.99
mm (0.6300") or 17.43 mm (0.6867") (actual size depends
on model).
Check seal groove width max 1.58 mm (0.0623").
Measure eccentricity between large and small shaft diame-
ter, max 0.008 mm. T.I.R.(0.0003").
Check balance to 0.36 gm mm (0.0005 oz. inch) in both
planes. Replace if outside limits.
4 Compressor cover (3)
Visually inspect for evidence of contour damage. Replace if
damage is excessive.
5 Turbine housing (18)
Visually inspect for damage and excess temperature dam-
age such as cracking, pitting, warping, erosion. Reject and
replace if damage is excessive.
Service procedures - intake and exhaust systems
6 Turbine heat shield (16)
Replace if cracked or warped.
7 Piston ring holder (4)
Check piston ring groove width max 1.58 mm (0.0623") and
for signs of taper or damage to groove. Reject if worn.
8 Thrust washer (11)
Replace if thrust surfaces are worn. In most cases these
may be reused by reversing the position so that the non
worn side is in contact with the thrust bearing.
9 Spacer sleeve
This part should show no sign of surface damage or wear.
Assembly
1
Use only the parts complying with the dimensions outlined in
the inspection instructions above plus an "Overhaul Kit".
2
All parts must be washed in clean solvent and dried with
compressed air.
3
Fit the inner snap rings to the bearing housing bushing. Add
a few drops of oil to the bushing and fit the journal bearings
and outer snap rings.
4
Fit a new piston ring to the groove in the shaft and wheel as-
sembly.
5
Fit turbine backplate (16) over the shaft section so that it
rests on the back of the turbine wheel.
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