Chevrolet 1991 Light Duty Truck Repair Manual page 156

4B4-6 10 1/2-INCH RING GEAR
Figure 10—Installing the Inner Pinion Bearing
2. Outer pinion bearing cup (6) using J 8608 and
J 8092.
3. Inner pinion bearing cup (13) using J 24432 and
J 8092.
4. A new collapsible spacer (12) to the pinion.
5. Pinion (14) into the pinion gage (10).
6. Pinion outer bearing (6) onto the pinion.
• Press the bearing onto the pinion.
7. Pinion oil seal (5) using J 24434 and J 8092.
8. Pinion flange oil deflector (4) and pinion flange (3)
to the pinion splines.
9. Washer (2) and a new pinion nut (1).
• Place the pinion cage assembly into the vise.
10. Flange holder J 8614-01 to the pinion flange.
| ^ | Tighten (Figure 11)
• The nut until the pinion end play is just taken
up. Rotate the pinion while tightening in order
to seat the bearings. Once there is no end play
in the pinion, the preload torque should be
checked.
Figure 11—Installing the Pinion Nut
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Figure 12—Checking Pinion Preload
• Remove J 8614-01. Using an inch-pound
torque wrench, check the pinion preload by
rotating the pinion with the wrench. Preload
should be at or below 2.8 to 4.0 N.m (25 to 35
in. lbs.) for new bearings, or 0.56 to 1.7 N.m
(5-15 in. lbs.) for used bearings (figure 12).
• If the preload torque is below the preloads giv­
en above, continue torquing the nut in small
increments. Check the preload after each tight­
ening. Each tightening increases the bearing
preload by several pounds. If the bearing
preload is exceeded, the pinion will have to be
removed, and a new collapsible spacer
installed.
• Once the preload has been obtained, rotate the
pinion several times to assure that the bearings
have seated. Recheck the preload, and adjust
if necessary.
11. Pinion cage (10) to the axle housing. Refer to
" Pinion Installation" in this section.
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Figure 13—Installing the Pilot Bearing
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