ARB RD81 - Manual (Page 19)

4 Installing the Air Locker
17
Insert and hold the Air Locker into the differential housing.
NOTE : Be careful not to bend or damage the seal housing
tube.
Insert the shim pack determined earlier as ‘D’ between the bearing
cup (right hand side as shown in figure 6.) and the differential
housing. Lightly tap the shim pack in if required.
Push (or lightly pry) the Air Locker hard across to the right-hand
side, and measure the gap (also called the ‘end float’) between the
face of the bearing cup (slightly protruding from the seal housing)
and the bearing seat of the housing with a feeler gauge.
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 ‘E’ in Figure 10.
PRE-LOAD + END FLOAT = SHIM PACK
Create a shim pack to match ‘E’.
To achieve this desired shim thickness you can:
• Machine down the factory shim thickness.
• Add shims between the factory shim and the bearing cup.
• Purchase new factory shims at the desired thickness.
• Use a universal shim kit available from most drive train specialists.
NOTE : Do not add shims between the bearing cone and the
bearing seat and NEVER machine the Air Locker.
Spread the differential housing again (Refer to section 2.6).
Install the shim pack between the bearing cup and the differential
housing.
NOTE : If the shim pack is too difficult to install then the
spreader tension may need to be increased. Do not
spread the housing more than 0.50mm [0.020”].
Rotate the seal housing so that the solder joint of the tube points
straight outward.
Release all spreader tension.