ARB RD85 - Manual (Page 11)

3 Bench Measurement
9
3.1 Measurement for Pre-Load Shimming
The original bearing type and shim type are commonly reused on the
left hand (ring gear) side of the Air Locker, however, in order to
reproduce a similar backlash and pre-load to that of your existing
differential, measurements need to be taken so that the correct shim
thickness can be determined for this side.
A replacement tapered roller bearing, supplied with the kit, is to be
installed on the right hand side (opposite the ring gear) of the Air
Locker. Because of this, the original bearing from this side will not be
reused. You must, however, retain all original shims for the following
measurements and simple calculations.
c Secure the original differential to a work bench.
c Remove the bolts that hold the ring gear in place.
c Using a plastic or copper hammer, tap in a circle around the ring
gear to separate it from the differential carrier.
c Remove the original bearings from the differential carrier using a
bearing puller.
NOTE : Keep the shims separated so that they can be
identified as to which end of the differential they came
from.
c Using a caliper or similarly accurate measurement method
(i.e., able to take accurate measurements within 0.04mm [0.0015”]),
measure the distance from the bearing shoulder to the ring gear
mounting face (shown as ‘A’ in Figure 4.) of the original differential
and record this measurement as ‘A’.
c Measure the thickness of the shim pack removed from the ring gear
side of the differential carrier (shown as ‘B’ in Figure 4.).and record
this measurement as ‘B’.
c Measure the distance from the Air Locker bearing shoulder to the
ring gear mounting face (shown as ‘C’ in Figure 5.) and record this
measurement as ‘C’.