Aligning The Over-Center Preload; Installing The Retaining Ring - Chevrolet 1991 Light Duty Truck Repair Manual

3B3-8 POWER STEERIN G
Seals
A. Torque Wrench
Point Socket
B. 12
Nut
227.
222. Adjusting Screw
Stub Shaft
251.
Figure 22—Aligning the Over-Center Preload
Adjust (Figures 15 through 23)
Tools Required:
J 7624 Spanner Wrench
J 7754-01 Torque Wrench
• Bearing preload:
• Use tool J 7624. Turn the adjuster plug (240) to
the left until the plug assembly is firmly bot­
tomed (30 N.m (22 ft. lbs.) (figure 16).
• Mark the housing in line with one of the holes
in the adjuster plug (figure 17).
• Measure back (to the left) 13mm (1/2-inch) and
re-mark the housing (figure 18).
• Rotate the adjuster to the left until the hole in
the adjuster is in line with the second mark
(figure 19).
• Install the adjuster locknut (245) and torque the
nut to 108 N-m (80 ft. lbs.).
• Hold the adjuster plug to maintain alignment of
the hole with the mark.
• Check the turning torque of the stub shaft,
using J 7754-01 and a 12-point socket. The
reading should be taken with the beam of the
wrench near vertical while turning the wrench
to the left at an even rate (figure 20). If the
reading is less than 0.60 N m (5 in. lbs.) or
more than 1.13 N.m (10 in. lbs.), repeat the
adjustment procedure.
• Coat the stub shaft (251) area just outside the
dust seal (206) with chassis lubricant or an all
purpose grease.
10. Bearing (209) using J 22407 and J 8092.
11. Washers (207) and seal (254), using J 6219 (fig­
ure ).
1
12. Retaining ring (205).
13. Rack piston (214) using J 21552 (figure 4).
14. Gasket (224) to side cover (225) and bend tangs.
15. Pitman shaft (221), side cover (225), nut (227)
assembly.
F4929
16. Bolts (226).
17. Plug (215) into rack piston (214).
• Bolt (226) to 18 N.m (13 ft. lbs.)
• Plug (215) to 150 N-m (110 ft. lbs.)
18. Seal (218), plug (219) and retaining ring (220) to
housing (figure 23).
0 Adjust (Figure 22)
Tool Required:
J 7754-01 Torque Wrench
Pitman shaft preload.
1. Attach tool J 7754-01 and a 12-point socket on
the stub shaft splines.
2. Center the steering gear by turning the stub
shaft (251) from right to left and counting the
number of turns. Turn the shaft back halfway to
the center position.
3. Adjuster nut (227) loose, back out adjuster
screw (
4. Check the combined ball and bearing preload
by turning the torque wrench through the cen­
ter of travel. Note the highest reading.
5. Tighten the adjusting screw (222) until the
torque wrench reads 0.6-1.3 N-m (6-10 in. lbs.)
higher than the reading noted in step 3.
) fully, then turn in, one full turn.
222