GMC 1990 Light Truck Repair Manual page 208

4B5-22 DAN A REAR AXLES
• This reading indicates the amount of shims
needed for a nominal pinion setting. The
pinion marking may change the pinion depth
by adding or deleting shims from the nominal
pinion setting.
• A positive ( + ) pinion marking indicates that the
distance between the ring gear centerline and the
pinion head must increase by the number of
thousandths marked on the pinion. This means that
the shim pack will decrease by the same number of
thousandths.
• A negative (-) pinion marking indicates that the
distance between the ring gear centerline and the
pinion head must decrease by the number of
thousandths marked on the pinion. This means that
the shim pack will increase by the same number of
thousandths.
• A pinion etched zero (0) will use the nominal setting
as determined in this procedure.
9. Measure each shim separately with a micrometer
and add them together to obtain the total shim pack
thickness. If a baffle (5) or slinger is used, these
must also be measured and included in the shim
68
pack (figure ).
PINION INSTALLATION
|-K-| Install or Connect
Tools Required:
J 7818 Front Pinion Bearing Cup Installer
J 5590 Rear Pinion Bearing Cone Installer
C-4204 Cup Installer (Miller)
C-4171 Handle (Miller)
J 8092 Handle
J 8614-01 Pinion Flange Remover
D-116-1 Pinion Height Block
D-116-2 Arbor Discs
D-115-3 Arbor
D-115-2 Scooter Gage Block
1. Place the required amount of shims (and baffle if
used) in the inner bearing bore.
2 Drive the inner bearing cup into the axle assembly
.
using C-4204 and C-4171. The cup must be seated
on the shims (figure 69).
3.
Drive the outer bearing cup into the axle assembly
using J 7818 and J 8092 (figure 70).
4. Inner bearing cone (and slinger if used) on pinion.
Drive the bearing onto the pinion shaft using J 5590
(figure 71).
• If installing a new bearing, be certain that it is
the same width as the old bearing.
Pinion into the axle housing.
Outer pinion bearing (7) (and slinger if used).
Do not assemble the preload shims or pinion oil seal
at this time.
Pinion flange (10).
Washer (11) and pinion nut (12).
Tighten
The nut (12) while holding the pinion with
J 8614-01. Tighten the nut until it requires a
torque of 1.13 N-m (10 in. lbs.) to rotate the
Figure 70—Installing the Pinion Front Cup
F-04718