Pinion Gear Bearing Preload Adjustment - Jeep 1979 CJ-5 Technical & Service Manual

AXLES 2F-27
N O T E J To avoid false readings, do not allow the gauge
anvil to contact the pinion gear at any point.
(15) Assemble Clamp J-5223-24 a n d Bolt J-5223-29
and mount on axle housing (fig. 2F-38). Use one axle
housing cover bolt to attach clamp to housing.
(16) Extend clamp bolt until it presses against gauge
block with enough force to prevent gauge block from
moving.
(17) Loosen gauge block thumbscrew to release
plunger. When plunger contacts arbor tool, tighten
thumbscrew to lock plunger in position. Do not disturb
plunger after locking in place.
(18) Remove clamp and bolt assembly from axle
housing.
(19) Remove gauge block and measure distance from
end of anvil to end of plunger using 3 inch (7.62 cm)
micrometer (fig. 2F-39). This dimension represents
measured pinion depth. Record this dimension for as-
sembly reference.
(20) Remove bearing caps and remove arbor tool and
discs from housing.
(21) Remove pinion gear, rear bearing cup, and pin-
ion depth shim from housing.
(22) Measure thickness of depth shim used in step
(10). Add this dimension to measured pinion depth ob-
tained in step (8). From this total, subtract desired pin-
ion depth. Result represents correct shim thickness
required.
NOTE: The desired pinion depth is the standard set-
ting plus or minus the pinion depth variance.
(23) Following examples will illustrate procedure for
determining correct shim thickness.
Example I—Pinion Depth Variance is Plus (+)
Step 1—Determine desired pinion depth
Add pinion depth variance (marked on pinion gear) to
standard setting. Result is desired pinion depth.
Standard Setting 2.547 (6.46 cm)
Pinion Depth Variance +0.007 (0.17 mm)
Desired Pinion Depth = 2.554 (6.48 cm)
Step 2—Determine total measured pinion depth
Add measured pinion depth to measured shim thick-
ness. Result is total measured pinion depth.
Measured Pinion Depth 2.550 (6.47 cm)
Starter Shim Thickness ........+0.098 (2.48 mm)
Total Measured Pinion Depth = 2.648 (6.72 cm)
Step 3—Determine correct shim thickness
Subtract desired pinion depth from total measured
pinion depth. Result is correct shim thickness.
Total Measured Pinion Depth 2.648 (6.72 cm)
Desired Pinion Depth .......-2.554 (6.48 cm)
Correct Shim Thickness = 0.094 (2.38 mm)
Example II—Pinion Depth Variance is Minus (-)
Step 1—Obtain desired pinion depth
Subtract pinion depth variance (marked on pinion
gear) from standard setting. Result is desired pinion
depth.
Standard Setting 2.547 (6.46 cm)
Pinion Depth Variance -0.003 (0.07 mm)
Desired Pinion Depth = 2.544 (6.46 cm)
Step 2—Determine total measured pinion depth
Add measured pinion depth to measured shim thick-
ness. Result equals total measured pinion depth.
Measured Pinion Depth 2.542 (6.45 cm)
Starter Shim Thickness +0.096 (2.43 mm)
Total Measured Pinion Depth = 2.638 (6.70 cm)
Step 3—Determine correct shim thickness
Subtract desired pinion depth from total measured
pinion depth. Result is correct shim thickness.
Total Measured Pinion Depth....... 2.638 (6.70 cm)
Desired Pinion Depth . . . . . . . . . . . . . - 2 . 5 4 4 (6.46 cm)
Correct Shim Thickness = 0.094 (2.38 mm)
Pinion Gear Bearing Preload Adjustment
(1) Install correct thickness pinion depth shim(s) in
axle housing bearing cup bore.
(2) Install rear bearing cup and pinion gear.
(3) Install replacement collapsible spacer and front
bearing on pinion gear.
CAUTION: The collapsible spacer controls pinion
bearing preload. Do not reuse the old spacer. Use a
replacement spacer only.
(4) Install pinion oil seal using tool J-22661 (fig. 2F-
28).
(5) Install pinion yoke and replacement pinion nut.
Tighten pinion nut finger-tight only.
(6) Tighten pinion nut only enough to remove end
play and seat pinion bearings. Use tool J-22575 to
tighten nut and use tool J-8614-01 to hold yoke while
tightening nut. Rotate pinion while tightening nut to
seat bearings evenly.