ARB RD87 - Manual (Page 17)

3 Installing the Air Locker
15
Figure 10.
c Lightly fasten the seal housing to the clamping plate by finger
tightening the supplied cap screws into the clamping plate. Use
thread locking compound on the threads.
c Apply a minimum of 620 kPa [90 PSI] of compressed air to the seal
housing tube and hold the pressure.
c Rotate the differential several times by rotating the drive pinion.
This will allow the seal housing to self center.
c While continuing to slowly rotate the differential with the air system
pressurized, gradually tighten the cap screws in a circular pattern
until fully tightened to 4.6 Nm (3.5 ft.lbs). Do not over tighten.
NOTE : Extreme care must be taken to ensure that the seal
housing is concentric with the bearing journal. Use an
automotive feeler gauge to insure that an even gap is
present all of the way around the seal housing. If the
gap is not even, the seal housing O-rings may leak.
Repeat the cap screw tightening procedure if
necessary.