Rotary Valve; Removing Valve Spool From Rotary Valve; Exploded View Of Rotary Valve - Pontiac Grand Prix Service Manual

STEERING 9-33
3. Remove and discard Teflon ring and backup seal
and rack-piston nut.
ROTARY VALVE
DISASSEMBLE
The rotary valve assembly includes the valve body, valve
spool and the stub shaft assembly. All these parts are
precision units and are hydraulically balanced at the
factory.
Under no conditions are parts in this unit to be replaced
or interchanged with other parts or unilrs.
If
unit parts are scored or damaged, the entire rotary
valve assembly is to be replaced.
NOTE: If the valve spool dampener O-ring requires
replacement (due to "squawk" in gear), perform the
following operations.
1. Work spool spring onto bearing diameter of stub
shaft and remove spool spring.
2. Tap end of stub shaft assembly gently against
workbench to remove valve spool (Fig. 9-63).
CA UTION: The diametrical clearance between the
valve body and spool may be as low as .0004". The
slightest cocking of spool may jam it in valve body (Fig.
9-64).
NOTE: If slight sticking occurs, make a gentle attempt
to reverse the removal procedure. If this does not free the
spook, it has become cocked in valve body bore and may
be removed later.
3. Remove and discard valve spool dampener O-ring.
4. Remove stub shaft, torsion bar (small diameter bar
extending through stub shaft) and valve cap assembly
V A L V E S P O O L SPRING
V A L V E S P O O L D A M P E N E R ("0 RING)
R O T A R Y V A L V E
TORSION B A R
V A L V E S P O O L
R O T A R Y V A L V E (TEFLON) RINGS
TORSION B A R AND S T U B S H A F T A S S E M B
Fig. 9-65 Exploded View of Rotary Valve
by tapping end of torsion bar lightly with a plastic
hammer. This will dislodge the cap from valve body
cap in (Fig. 9-65). Do not disassemble stub shaft
assembly. The parts are pinned together and 'are
serviced as an assembly.
5. If valve spool has become cocked' as described in
step 2, it can now be freed as follows:
a. Inspect parts to deterdine in which direction the
spool is cocked.
b. A few very light taps with a soft plastic or rawhide
hammer should align and free the spool in the bore.
c. Remove and discard O-ring dampener seal from
valve spool.
6. Carefully remove and discard valve body Teflon
rings and ring backup O-ring seals.
HOUSING
DISASSEMBLE
1. Remove pitman shaft outer dust seal backup washer
retaining ring, using Truarc pliers.
2. Remove outer dust seal backup washer.
3. Remove seal (double lip) by inserting offset
screwdriver between seal and backup washer and
prying out of housing.
C4 UTION: Do not damage housing bore when remov-
ing seal.
4. ,Remove backup washer.
5. Remove seal (single lip) by cutting and collapsing
seal.
CAUTION: Do not damage housing bore when remov-
Fig. 9-64 Removing Valve Spool from Rotary Valve
ing seal.