181 Fbi Differential Bearing Preload And Gear Backlash - Jeep Cherokee 2000 Service Manual

3 - 52 TUBE, 181, AND 186 FBI AXLE
ADJUSTMENTS (Continued)
(1) Assemble Pinion Height Block 6739, Pinion
Block 6733, and rear pinion bearing onto Screw 6741
(Fig. 79).
(2) Insert assembled height gauge components,
rear bearing and screw into axle housing through
pinion bearing cups (Fig. 80).
(3) Install front pinion bearing and Cone-nut 6740
hand tight (Fig. 79).
Fig. 80 Pinion Height Block—Typical
1 – PINION BLOCK
2 – PINION HEIGHT BLOCK
(4) Place Arbor Disc 6732 on Arbor D-115-3 in posi-
tion in axle housing side bearing cradles (Fig. 81).
Install differential bearing caps on Arbor Discs and
tighten cap bolts to 41 N·m (30 ft. lbs.).
NOTE: Arbor Discs 6732 has different step diame-
ters to fit other axles. Choose proper step for axle
being serviced.
(5) Assemble Dial Indicator C-3339 into Scooter
Block D-115-2 and secure set screw.
(6) Place Scooter Block/Dial Indicator in position
in axle housing so dial probe and scooter block are
flush against the rearward surface of the pinion
height block (Fig. 79). Hold scooter block in place and
zero the dial indicator face to the pointer. Tighten
dial indicator face lock screw.
(7) With scooter block still in position against the
pinion height block, slowly slide the dial indicator
probe over the edge of the pinion height block.
(8) Slide the dial indicator probe across the gap
between the pinion height block and the arbor bar
with the scooter block against the pinion height block
(Fig. 82). When the dial probe contacts the arbor bar,
the dial pointer will turn clockwise. Bring dial
pointer back to zero against the arbor bar, do not
turn dial face. Continue moving the dial probe to the
crest of the arbor bar and record the highest reading.
Fig. 81 Gauge Tools In Housing—Typical
1 – ARBOR DISC
2 – PINION BLOCK
3 – ARBOR
4 – PINION HEIGHT BLOCK
If the dial indicator can not achieve the zero reading,
the rear bearing cup or the pinion depth gauge set is
not installed correctly.
(9) Select a shim/oil slinger equal to the dial indi-
cator reading plus the drive pinion depth variance
number etched in the face of the pinion (Fig. 77). For
example, if the depth variance is –2, add +0.002 in.
to the dial indicator reading.
Fig. 82 Pinion Gear Depth Measurement—Typical
1 – ARBOR
2 – SCOOTER BLOCK
3 – DIAL INDICATOR
181 FBI DIFFERENTIAL BEARING PRELOAD
AND GEAR BACKLASH
INTRODUCTION
Differential side bearing preload and gear backlash
is achieved by selective shims positioned behind the
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