Outer Limits 4x4 Board

Anybody with a rear ARB locker ever have 1 or 2 crown wheel bolts fall out and stuff everything. 1 got jamed between the arb housing and has forced it out and bent something and broke 3 teeth off the crown wheel Looks I now need a new locker housing as well as ring and pinions. Im regearing while its out.
The mechanic that works on my diffs (has been doing diffs for 20 yrs) said that he did everything right ie: locktight and torqued all the bolts to spec etc. He said this has happened only 3 times before but only with diffs that have an arb airlocker.He seems to think the design of the locker allows a bit of movement causing a bolt to slowly work loose.Has anyone overcome this problem? BTW, this happened on the bitumen, locker is just over 12 mths old and I dont drive that hard. Thx for any info.

Cheers, Mark.

had my air lockers now for 4 years no troubles at all

Had it in the front of a GQ twice,4 years apart.
Follow the instructions,heat the crownwheel to drop it over the carrier as pulling it on can distort the carrier face and allow flex and movement.
J Top

happened a bit to the early airlockers for the GQ but they changed them to fix it.

have installed over 2000 ARBs and never had any bolts back out. me thinks bolts were not cleaned and loctited.

Bolts were DEFINATELY loctited. He is using a loctite primer this time.He did mention there is a part that is 2 piece , where as stock components are 1 piece.(pls bare with me I know SFA about diffs)where this might result in some movement over time. Its in a Dana 44 , if that makes any difference.

Big reds comments refer to the case not the crown wheel bolts.
The Crown wheel bolts will not come out if the locktite works correctly. Nothing at all to do with the brand of locker.

bazzle

I havnt had the crown wheel bolts fall out but have had all 4 center casing bolts shear the heads off and then go through the crown wheel. On a 91 hilux 2.8d. only chipped the trailing edge of the pinnion gear lucky. new bolts/locklite and hope it doesnt do it again. 200,000km.

I have a GQ with ARB's front and rear, front is only a year or so old, no brobs, the rear was put in 12 years ago by previous owner, had a noise on my way home from work one avo, did some checking, pulled the centre out to find one bolt out, and evry other one was in about 2 turns or so, so i cleaned it all up, replaced all, loctited and tensiond, and had no dramas since,

when one bolt came out, it broke off a small section of the airlocker to crown mating surface, but like i said, no dramas a year later. touch wood.

I dont totaly agree with you Baz ,because the C/W face is 2 thin plates instead of 1 thick one there is a weakness and room for movement.
J Top

IF? there is any movement between the 2 piece case it wont make properly loctited bolts come loose.. The threads are in the crownwheel. The crownwheel is an interference fit to case.


Bazzle