GMC 1990 Light Truck Repair Manual page 223

— 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
12. Pinion washer (61) and a new nut (62) using J 3453
to hold the pinion (figure 17).
Tighten
• Nut (62) to 325 N m (240 ft. lbs.).
PINION INSTALLATION
-► «- Install or Connect
Measure the pinion bearing shims (50). If
pinion and ring gear set is installed, the
bearing shim pack must be adjusted.
Examine the heads of the new and old drive pinions.
Compare these codes, and adjust the pinion
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.
•
The pinion cage (54) to the axle housing.
2
.
Figure 19—Installing the Seal
The shims, housing, and cage must be clean.
a new
pinion