ARB RD129 - Manual (Page 17)

4 Installing the Air Locker
15
c Select suitable shims from the shim kit supplied with your Air
Locker to make up a shim pack of this thickness. (Refer to section
3.2 for methods of shim adjustment).
c The seal housing will have to be removed in order to add shim pack
‘E’. Ensure that the seal housing is re-installed correctly.
4.5 Drilling and Tapping the Bulkhead Port
An air line port must be drilled and tapped through the differential
housing to mount the bulkhead fitting into.
c Mark a spot on the exterior of the differential housing toward the top
in an area that will be well clear of the Air Locker body, the ring
gear, and any other obstructions that could snag the seal housing
tube. (Fig.7.)
Figure 7.
c Remove the Air Locker from the differential housing.
c Cover the drive pinion area with a rag to protect it from metal filings.
c Secure the differential housing to the work bench.
c Drill a 11.2mm [7/16”] diameter hole through the differential housing
square to the outside surface.
c Tap the hole from the outside using ¼”NPT thread tap.