ARB RD119 - Manual (Page 12)

3 Installing the Air Locker
10
3.2 Re-Mounting the Ring Gear
Remove the bolts that hold the ring gear in place.
Using a plastic or copper hammer, tap in a circle around the ring
gear to separate it from the original differential carrier.
NOTE : Some aftermarket ring gears use 1/2” diameter bolt
threads instead of 7/16” . If this is the case then the
bolt holes of the Air Locker will require enlargement
to 13mm [0.512”]. This operation should be
performed by a qualified machinist.
Apply a thin film of high pressure grease to the ring gear shoulder
of the Air Locker to prevent seizing.
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.
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.
Dry the gear and bolt holes with compressed air (if wet).
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.
Apply a thread locking compound to the thread of each ring gear
bolt before inserting it. Do not apply the compound directly into the
threaded hole as this could prevent the bolt from reaching its full
depth.
Tighten the ring gear bolts in a star pattern with a torque wrench
according to your vehicle manufacturer’s specified torque.