ARB RD80 - Manual (Page 21)

4 Installing the Air Locker
19
c Measure to the bearing cap from exactly the same position on the
differential housing that you took the previous measurements from.
(Fig.11.)
c Mark the tube position with a center punch where the clearance is
to be made for the seal housing tube.
Figure 11.
c Remove the bearing cap from the differential housing.
c Measure the distance from the center punch mark made on the
bearing cap to the closest edge of the bearing cap.
c If the center punch mark is greater than 6.35mm [¼’’] from the
closest edge of the bearing cap, it is recommended that a small
hole be drilled through the bearing cap (Section 4.7.1). If less than
6.35mm [¼’’] from the edge it is recommended that a notch is filed
into the side of the bearing cap to avoid break-through while drilling
(Section 4.7.2).