ARB RD84 - Manual (Page 19)

3 Installing the Air Locker
17
3.5 Drilling and Tapping the Bulkhead Port
An airline port must be drilled and tapped through the differential
housing to mount the bulkhead fitting into.
c Mark a spot on the top of the outside shell of the differential
housing approximately 38mm [1. 5”] in as shown in Figure 11.
Figure 11.
c Cover the drive pinion and axle tube areas with a rag to protect
them from metal filings.
c Drill through the housing square to the outside surface using a
11.2mm [7/16”] drill.
c Tap the hole from the outside using a ¼” NPT pipe tap.
c Remove any sharp edges from the hole that may chip-off and fall
into the housing.
c Carefully remove the rags and inspect with a service light inside the
housing to insure no metal filings are left behind.