9. Install a new piston ring (11) on the
16. Continue to tighten the retaining nut
until
turbine wheel shaft assembly.
the shaft increases
in length
0.009"-0.010".
NOTE
NOTE
Before installing the piston ring,
fill the piston ring groove with
Tighten the nut in such a manner
Dow Corning High Vacuum Silicone
as not to impose bending loads on
grease, or equivalent.
the shafts.
If equipment is not available to
10. P o s i t i o n w h e e l s h r o u d ( 1 0 ) a g a i n s t
measure the shaft stretch, tighten
the center housing and insert wheel
the wheel retaining nut to 35-55
shaft assembly (9) through the wheel
lb-in (4-6 Nm) torque. Then con-
shroud and into the center housing.
tinue to tighten the nut through
an angle of 120-130.
NOTE
Be careful not to scuff or scratch
17. C h e c k t h e b e a r i n g a x i a l e n d p l a y :
the bearings when installing the
shaft.
A . Clamp the center housing in a bench
vise equipped with soft jaws as shown
11. P l a c e t h e t u r b i n e w h e e l s h a f t a s s e m
bly, shroud, center housing and back-
plate
upright
in
a
suitable holding
fixture as shown in Figure 11D-31 on
page 11D-25.
NOTE
If
a
holding
fixture
is
not
available, clamp a suitable socket
or box wrench in a vise and place
the extended hub on the shaft in
the socket or wrench.
12. With the compressor wheel at room
temperature, position it over the shaft.
13. Lightly lubricate the shaft threads
and wheel face that will be under the nut
with engine oil and install the retaining
Tighten the nut to 125-150 lb-in
nut.
(14-17 Nm) torque to seat the compressor
wheel against the thrust spacer.
F i g u r e 11D-32. Checking Bearing
Axial End Play
14. Loosen the nut and inspect the nut
face and front face of the compressor
B. Fasten the dial indicator and magnetic
wheel to be sure they are smooth and
base (J 7872-2) to the center housing
so that the indicator tip rests on the
clean.
end of the rotating shaft on the com-
pressor side (see Figure 11D-33 on
15. Retighten the nut to 35-55 lb-in (4-6
Nm) torque.
11D-27
Air Intake System
