Cadillac 60 Series 1963 Shop Manual page 76

POWER STEERING
5-17
5. Lubricate new O-ring seal with power steer-
ing fluid and install in groove on adjuster plug.
Assemble large O.D. thrust bearing race, thrust
bearing, small thrust bearing race, and thrust
bearing spacer on adjuster plug. Press bearing
retainer into needle bearing bore, using a brass
or wooden dowel. Radial location of dimples is
not important.
c. Stub Shaft and Valve Assembly
The complete valve assembly is a precision
unit with selective fitted parts and is hydraulically
balanced during assembly. If replacement of any
valve part other than rings or seals is necessary,
the complete rotary valve assembly must be r e -
placed.
Do not disassemble valve unless absolutely
necessary to avoid possibility of damage to the
assembly. If valve spool dampener O-ring r e -
quires replacement, remove valve spool as out-
lined below, replace O-ring and install spool.
Disassembly
1. Remove cap to worm O-ring seal and dis-
card.
2. Remove spool spring by prying small coil,
using a small screwdriver. Work spring onto
bearing diameter of stub shaft. Slide spring off
stub shaft.
3. Remove valve spool from valve body.
CAUTION: Clearance between valve body
and spool may be as low as .0004 inch. Slightest
cocking of spool may cause it to stick in the
valve body. To remove valve spool:
a. Hold valve assembly in both hands with
stub shaft pointing downward.
b. Place fingers under valve body and thumbs
on valve body cap, holding it against valve body
squarely.
c. Tap end of torsion bar lightly against
workbench. This will expose spool far enough
so that it may be withdrawn from valve body.
d. Withdraw spool with a steady twisting pull
to prevent jamming. If slight sticking occurs,
carefully work spool back into valve body. If
this does not free spool, it has become cocked
in the valve body bore. Do not attempt to force
the spool in or out if it becomes cocked. Con-
tinue to disassemble valve assembly as follows
and return to spool as described later.
4. Remove stub shaft, torsion bar, and valve
cap assembly by holding valve assembly in both
hands as before, only with thumbs on valve body.
Tap torsion bar lightly against workbench. This
will dislodge cap from valve body to cap pin. Stub
shaft, torsion bar, and valve cap assembly can
now be removed from valve body.
5. If valve spool has become cocked as des-
cribed in Step 3, it can now be freed. Visual in-
spection on a flat surface will show in which
direction spool is cocked. A few very light taps
with a light, soft plastic or rawhide mallet should
align spool in bore and free it.
CAUTION:
If spool can
Inspection
Do not tap with anything metallic,
be rotated, it can be removed.
1. If there is evidence that torsion bar O-ring
seal inside stub shaft has been leaking, entire
valve assembly should be replaced.
2. Check pin in valve body that engages cap.
If it is severely worn, cracked, or broken, the
entire valve assembly should be replaced.
3. Check smaller of the two worm pin grooves
in valve body. If it is severely worn, entire valve
assembly should be replaced.
4. Check spool drive pin on stub shaft. If it is
severely worn, cracked, or broken, entire valve
assembly should be replaced.
5. Examine spool O.D. for nicks, burrs, or bad
wear spots. If any are found, entire valve as-
sembly should be replaced. A slight polishing is
normal on valving surfaces.
6. Examine valve body I.D. for nicks, burrs, or
bad wear spots. If any are found, entire valve
assembly should be replaced. A slight polishing
is normal on valving surfaces.
7. Check fit of spool in valve body before in-
stalling valve spool dampener O-ring seal.
When lubricated with Power Steering fluid,
spool should rotate smoothly without binding or
catching. If either occurs, entire valve assembly
should be replaced.
8. Measure spool spring with a scale. Free
length should be 53/64 inch. Inner diameter of
top loop of spring should be 49/64 inch to 51/64
inch. Replace spring if measurements are not as
specified.
9. Examine needle bearing diameter of stub
shaft. If it is badly worn, or scored, entire valve
assembly should be replaced.
10. Visually inspect valve body rings. If dam-
aged, carefully cut valve rings and O-ring back-up
seals. Remove and discard.