3 Installing the Air Locker
20
3.7
Pre-Load Shimming
In order to pre-load the tapered roller bearings in your
Air Locker
,
measurements need to be taken so that a value can be calculated for
the shim thickness
‘D’
in Figure 13.
3.7.1
A
Pre-Loading an Aluminum Housing
Grind or cut a notch into the left-hand factory shim as clearance for
the seal housing tube at final assembly. Figure 14. shows the
desired size of the notch.
Figure 14.
Remove any sharp or protruding edges from around the notch.
While holding the right-hand bearing cup in place, insert and hold
the
Air Locker
into the differential housing.
Insert one of the two master shims from the
Air Locker
shim kit
between the right-hand bearing cup and the bearing seat of the
axle housing with the rounded edge of the master shim facing away
from the center.
Insert the shim pack determined earlier as
‘B’
between the bearing
cup (right-hand side) and the master shim.
Insert the original factory shims in their original positions on both
sides.
Push (or lightly pry) the
Air Locker
hard across to the right-hand
side, and measure the maximum gap (also called the ‘end float’)
between the left-hand factory shim and the seal housing with an
automotive feeler gauge. (Fig.15.)
