ARB RD93 - Manual (Page 14)

3 Installing the Air Locker
12
3.3 Drilling and Tapping the Bulkhead Port
An airline port must be drilled and tapped through the differential
housing to mount the bulkhead fitting into.
Mark a spot on the top of the outside shell of the differential
housing that will be clear of the ring gear position once the seal
housing tube has been installed. Figure 6. shows how the tube will
port through the differential housing.
NOTE : Higher ratio gearing uses deeper (thicker) ring gears
with teeth that extend much further. Make sure the
intended hole location is far enough away from the
ring gear teeth that the air line will not be at risk of
contact with the current or future ring gears.
Figure 6.
Cover the drive pinion and axle tube areas with a rag to protect
them from metal filings.
Drill through the housing square to the outside surface using a
11.2mm [7/16”] drill. (Figure 7.)
Figure 7.