181 Fbi Pinion Gear Depth Adjustments; Pinion Gear Id Numbers; Shim Locations - Jeep 200 Cherokee Service Manual

3 - 48 TUBE, 181, AND 186 FBI AXLE
CLEANING AND INSPECTION (Continued)
• Wear and damage to pinion gear mate shaft,
pinion gears, side gears and thrust washers. Replace
as a matched set only.
• Ring and pinion gear for worn and chipped
teeth.
• Ring gear for damaged bolt threads. Replaced as
a matched set only.
• Pinion yoke for cracks, worn splines, pitted
areas, and a rough/corroded seal contact surface.
Repair or replace as necessary.
• Preload shims for damage and distortion. Install
new shims, if necessary.
ADJUSTMENTS
181 FBI PINION GEAR DEPTH
GENERAL INFORMATION
Ring and pinion gears are supplied as matched
sets only. The identifying numbers for the ring and
pinion gear are etched into the face of each gear (Fig.
71). A plus (+) number, minus (–) number or zero (0)
is etched into the face of the pinion gear. This num-
ber 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
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. 71 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 baffle. The shims are
placed between the rear pinion bearing and the pin-
ion gear head (Fig. 72).
Fig. 72 Shim Locations
1 – PINION GEAR DEPTH SHIM/OIL BAFFLE
2 – DIFFERENTIAL BEARING SHIM
If a new gear set is being installed, note the depth
variance etched into both the original and replace-
ment pinion. Add or subtract this number from the
thickness of the original depth shim/oil slinger to
compensate for the difference in the depth variances.
Refer to the Depth Variance chart.
Note where Old and New Pinion Marking columns
intersect. Intersecting figure represents plus or
minus the amount needed.
Note the etched number on the face of the pinion
gear head (–1, –2, 0, +1, +2, etc.). The numbers rep-
resent thousands of an inch deviation from the stan-
dard. If the number is negative, add that value to the
required thickness of the depth shims. If the number
is positive, subtract that value from the thickness of
the depth shim. If the number is 0 no change is nec-
essary.
pinion depth variance
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