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19-1 8
STEERING
PISTON
*
i
\
WORM SHAFT
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Fig. lrl-Installing the Piston Ring
piston groove, forcing the open ends of the ring out
for ease of locking the ring.
(28) Place the piston assembly in a vertical posi-
tion (wormshaft up) in a vise equipped with soft jaws.
(29) Inspect the cylinder head ferrule oil passage
for obstructions and the lands for burrs, then lubricate
the two large "0" rings and install them in the cylin-
der head grooves (Fig. 13).
(30) Install the worm sleeve seal, sleeve and snap
ring (if removed). Make sure the snap ring is seated
in the groove.
(31) Install the lower reaction seal (O-ring) in the
cylinder head groove.
(32) Slide the cylinder head assembly (ferrule up)
on the wormshaft. Test the wormshaft seal ring mak-
ing sure the gap is closed to avoid damaging the ring
as the cylinder head moves against the piston flange.
(33) Lubricate with Power Steering Fluid, Part No.
2084329 and install the parts in the following order:
(a) Lower thrust bearing race (thick).
(b) Lower thrust bearing.
(c) Lower reaction spring (with the small hole over
the ferrule).
(d) Lower reaction ring (flange up so ring protrudes
through reaction spring and contacts the reaction "0"
ring in the cylinder head).
(e) Center bearing race.
(f) Upper thrust bearing.
(g)
Upper thrust bearing race (thin).
(h) Start the wormshaft thrust bearing adjusting
nut (do not tighten).
(34) Turn the wormshaft counterclockwise one-half
turn. Hold the wormshaft in this position with the
splined nut, Tool C-3637 and socket wrench, then
tighten the nut to 50 foot-pounds to prestretch the
wormshaft threads.
CAUTION:
li
the wormshaft is turned more than
.ips
KR65A
Fig. IS-Checking
the Center Bearing Pre-Load
one-half turn, the cylinder head sleeve will clear
the oil seal ring on the wormshaft. Always position
the wormshaft oil seal ring before bottoming the
cylinder head against the piston top flange to avoid
damaging the oil seal ring.
(35) Loosen the adjusting nut. Place several rounds
of cord around the center bearing race (Fig. 15). Make
a loop in one end of the cord and hook the loop of
a distributor breaker arm spring scale Tool MTU-36
in the cord loop. Pulling the cord will cause the bear-
ing race to rotate. Retighten the worm bearing adjust-
ing nut while pulling on the cord with the scale. When
the adjusting nut is tightened properly, the reading
on
the scale should be 16 to 24 ounces (20 ounces pre-
ferred while the race is turning).
CENTER RACE
ADJUSTING NUT
CYLINDER HEAD
Fig. 76-Staking the Worm Shaft Bearing
Adjusting Nut
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