ARB RD99 - Manual (Page 15)

3 Installing the Air Locker
13
3.4 Checking for Assembly Clearance
IMPORTANT:
Some third member castings will require modification for
correct Air Locker installation. A properly installed
Air Locker will have no less than 2mm [1/16”] between any
part of the differential carrier and the third member casting.
Reassemble the pinion shaft assembly using only 2 bolts finger
tight. (The pinion shaft assembly will be fully assembled later)
Hold the tapered roller bearing cups onto the cones on the carrier.
Carefully insert the carrier assembly into the third member so that
the ring gear is in mesh with the drive pinion.
Using an automotive feeler gauge, check for adequate clearance
between the body of the Air Locker and the third member casting
around the pinion support bearing and behind the flange cap.
If necessary, remove the pinion shaft assembly and grind or file the
third member casting to gain clearance. An example of relief
grinding areas are shown in Figure 6.
Figure 6.