ARB RD85 - Manual (Page 16)

4 Installing the Air Locker
14
4.3 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 on the right
hand side (opposite the ring gear) toward the top in an area that will
be well clear of the differential, the ring gear, and any other
obstructions that could snag the seal housing tube.
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 an 11.2mm [7/16”] diameter hole through the differential
housing square to the outside surface. (Fig.6.)
Figure 6.
c Tap the hole from the outside using ¼”NPT thread tap.
c Remove any sharp edges that may chip off from around the hole
and fall into the housing.
c Very carefully, remove the rags and inspect with a service light
inside the housing to insure no metal filings are left behind.
NOT ISUZU SHOWN