GMC 1989 Light Duty Truck Repair Manual page 266

4C2-12 9 /4-INCH RING GEAR FRONT AXLE
3
torque of 1.13 N-m (10 in. lbs.) to rotate the
pinion (figure 32). Rotate the pinion several
times to seat the bearings and assure a more
accurate reading pinion depth setting.
9. The pinion depth checking tools D-116-1, D-116-2,
D-115-3, and D-115 to the top of the pinion.
• Place the discs and arbor into the differential
bearing bore.
• Place the pinion height block on top of the
pinion.
• Set the dial indicator at zero and slide the
scooter gage across the arbor (figure 33).
• The indicator will turn to the right or to the left
at the point of greatest deflection, depending
on the pinion marking.
• The needle will move to the left if the pinion is
marked (+ ).
• The needle will move to the right if the pinion
is marked (-).
• If the indicator reading is within 0.05 mm
(0.002-inch) of the pinion marking, the pinion is
correctly set. If the pinion depth does not meet
Figure 3 3 — C hecking the Pinion Depth S etting
specifications, change the shim pack by the
amount the indicator needle is from the pinion
marking.
Remove the pinion nut (12), washer (11), pinion
flange (10), slinger (8) and bearing cone (7).
10. Preload shims (6).
• In sta ll th e shim s th a t w ere rem oved, or
measure the old shims and replace them with
new shims if necessary.
Outer bearing (7) and slinger (8).
11
.
Apply a light coat of axle lubricant to the pinion seal
lip.
12 Outer pinion oil seal (9) using D-163 (figure 34).
.
13. Pinion flange (10).
14. Washer (11) and a new pinion nut (12).
Tig h ten (Figure 35 and 36)
The nut (12) while holding the pinion with
J 8614-01. Tighten the nut until it requires a
torque of 2.26 - 4.53 N-m (20 - 40 in. lbs.) to
rotate the pinion.
Remove shims to decrease the preload.
Figure 3 5 — T ig h ten in g th e Pinion Nut