3 Installing the Air Locker
3.6 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 9.
Insert and hold the Air Locker into the differential housing.
Insert the shim pack determined earlier as ‘B’ between the bearing
cup (right-hand side) and the axle housing.
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 outside of the seal housing and the inside face of the
axle housing with an automotive feeler gauge. (Fig.10.)
Figure 10.
Consult your vehicle manufacturer’s service manual to determine
the carrier bearing pre-load amount specified for your vehicle.
Add the specified pre-load amount to the measurement taken with
the feeler gauge to determine a shim amount for ‘D’ in Figure 9.
PRE-LOAD + END FLOAT = SHIM PACK
Create a shim pack ‘D’ from the shims supplied with your Air
Locker.
NOTE : A wide variety of shims has been included in the shim
kit for your convenience and to cover various Dana 60
applications, however it should not be necessary to
use them all.
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