ARB RD168 - Manual (Page 27)

3 Installing the Air Locker
25
3.11 Bench Testing the Air Locker
F To test the Air Locker; when 620kPa [90 PSI] shop air is applied to
the seal housing tube, the Air Locker should engage.
F Check all fittings and the seal housing for air leaks.
F Rotate the differential carrier by turning the pinion flange whilst
applying air pressure.
NOTE : An accurate way to test for air leaks is to fit a shut-off
valve to an air pressure gauge (ARB part # 0770005).
Once 620 KPA [90 PSI] is reached close the valve,
disconnect the air hose, and watch to see if there is any
drop in pressure. If so, this will indicate an air leak.
(Fig.15.)
Figure 15.
F If a leak is found to be present, spray a soap and water mixture
onto the bulkhead air fitting. Bubbles should appear at any leak
points.
NOTE : Do not spray this soapy mixture inside the differential.
F Check that leaky fittings have been adequately tightened.
F Disassemble, clean threads, and reapply thread sealant if leaking
persists.
If a leak is found at the seal housing, carefully remove the seal
housing assembly and examine the O-rings. Be very careful with the
O-rings and check for defects, damage, wear, or presence of foreign
material in the O-ring grooves. Replace if necessary.