ARB RD125 - Manual (Page 17)

3 Installing the Air Locker
15
c Select shims from the shim kit supplied with your Air Locker to
make the thickness ‘B’ as determined above.
c Place this shim pack between the master shim and the bearing cup.
c Re-measure the new distance ‘C’ from the Air Locker (now
including the shim pack ‘B’) to make sure that it matches ‘A’ on the
original differential.
NOTE : NEVER machine the Air Locker.
3.4 Mounting the Ring Gear
IMPORTANT:
Newer OEM Dana 35 ring and pinion sets use 7/16” bolts.
The flange holes of the Air Locker must be reamed from
Ø3/8” to Ø7/16” to suit.
c Apply a thin film of high pressure grease to the ring gear shoulder
of the Air Locker to prevent seizing.
c Thoroughly clean any thread locking compound or other foreign
matter from the holes of the ring gear, the threads of the ring gear
bolts, and the mating surfaces between the ring gear and the Air
Locker flange.
HINT : Stoning the ring gear mounting face before installation
will remove any high spots around the threads.
c Heat the ring gear to between 80 and 100
°
C [175 - 212
°
F] in hot
water or in an oven to slightly expand the gear and facilitate
assembly.
NOTE : NEVER HEAT GEARS WITH A FLAME! This could
damage the hardened surface of the gear and result in
premature wear or failure.
c Dry the gear and bolt holes with compressed air (if wet).
c Install the ring gear onto the Air Locker by aligning the bolt holes
and then gently tapping it around in a circle with a soft mallet.
Avoid using the bolts to pull down the ring gear as this puts excess
strain on the bolts and the differential flange.
c Apply a thread locking compound to the thread of each ring gear
bolt before inserting it. Do not apply threading compound directly
into the threaded hole as this could prevent the bolt from reaching
its full depth.
c Tighten the ring gear bolts in a star pattern with a torque wrench
according to your vehicle manufacturer’s specified torque.