GMC 1989 Light Duty Truck Repair Manual page 225

— Divide the diameter by 2 to find the radius in
inches.
— Multiply the radius by the number of pounds
on the scale.
Use a thinner spacer to increase bearing preload,
and a thicker spacer to decrease bearing preload.
Pinion flange (60) to the pinion (figure 16).
• Press the flange onto the pinion.
8 Pinion washer (61) and nut (62) using J 3453 to hold
.
the pinion (figure 17).
Tighten
• Nut (62) to 325 N m (240 ft. lbs.).
Remove J 3453, and recheck the rotation torque at
the pinion nut. The torque should be 5 to 15 in. lbs.
Adjust the preload if necessary.
Remove the pinion nut (62), washer (61), and flange
(60) (figure 18).
9. Pinion oil seal (58) using J 3154-04 (figure 19).
10 Pinion flange deflector (59).
.
11 Pinion flange (60) to the pinion (figure 16).
.
• Press the flange onto the pinion.
Figure 17— Installing the Pinion Nut
12-INCH RING GEAR (ROCKWELL) 4B6-7
Figure 18— Removing the Pinion Nut
Pinion washer (61) and a new nut (62) using J 3453
12
.
to hold the pinion (figure 17).
Tighten
• Nut (62) to 325 N m (240 ft. lbs.).
PINION INSTALLATION
0
Install or C onnect
• Measure the pinion bearing shims (50). If a new
pinion and ring gear set is installed, the pinion
bearing shim pack must be adjusted.
• Examine the heads of the new and old drive pinions.
C om pare th ese codes, and a d ju s t the p in ion
bearing shim pack accordingly. The chart in figure
20, shows the proper adjustment to be made to the
shim pack.
• If the original pinion is being used, the original
pinion shims should also be used.
Pinion bearing shims (50) to the pinion cage.
1
.
• The shims, housing, and cage must be clean.
The pinion cage (54) to the axle housing.
Figure 19— Installing the Seal