Jeep cherokee 2000 Service Manual page 86

3 - 50 TUBE, 181, AND 186 FBI AXLE
ADJUSTMENTS (Continued)
Fig. 75 Gauge Tools In Housing—Typical
1 – ARBOR DISC
2 – PINION BLOCK
3 – ARBOR
4 – PINION HEIGHT BLOCK
height block (Fig. 73). 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. 76). 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.
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 baffle equal to the dial indica-
tor reading plus the pinion depth variance number
etched in the face of the pinion (Fig. 71). For exam-
ple, if the depth variance is –2, add +0.002 in. to the
dial indicator reading.
186 FBI PINION GEAR DEPTH
GENERAL INFORMATION
Ring gear and pinion are supplied as matched sets
only. The identifying numbers for the ring gear and
pinion are etched into the face of each gear (Fig. 77).
A plus (+) number, minus (–) number or zero (0) is
etched into the face of the pinion gear head. This
number is the amount (in thousandths of an inch)
the depth varies from the standard depth setting of a
pinion etched with a (0). The standard setting from
the center line of the ring gear to the back face of the
Fig. 76 Pinion Gear Depth Measurement—Typical
1 – ARBOR
2 – SCOOTER BLOCK
3 – DIAL INDICATOR
pinion is 92.08 mm (3.625 in.). The standard depth
provides the best gear tooth contact pattern. Refer to
Backlash and Contact Pattern Analysis paragraph in
this section for additional information.
Fig. 77 Pinion Gear ID Numbers
1 – PRODUCTION NUMBERS
2 – DRIVE PINION GEAR DEPTH VARIANCE
3 – GEAR MATCHING NUMBER (SAME AS RING GEAR
NUMBER)
Compensation for
achieved with a select shim/oil slinger. The shim/oil
slinger is placed between the rear pinion bearing and
the pinion gear head (Fig. 78).
If a new gear set is being installed, note the depth
variance etched into both the original and replace-
ment pinion. Add or subtract the thickness of the
original depth shims to compensate for the difference
in the depth variances. Refer to the Depth Variance
chart.
pinion depth variance
XJ
is