Anyone set up an ARB air locker themselves? I think I broke mine..

AlbatrossCafe

First Fill-Up (of many)
Location
Western WA
I have some questions for anyone that might be an expert. Long story short - my air locker stopped working & I think I messed up the connection at the diff. I'm referencing this "how-to" thread even though it is using newer style fittings compared to what I have.

A shop set up my air locker in my M205 initially. It has functioned just fine. It was set up using the compression nut with this little ferrule that goes around the air line and screws into the bulkhead that is on the diff.

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Well recently I decided I wanted to make it easier to take the hose on/off for when I drop the diff, so I bought a 90-degree banjo and push-in fittings for the air-line:

OEACpnQ.jpg


Well my lazy a$$ tried to install this while the diff was in the truck to save some time. I figured it was as easy as removing the old fitting and screwing this new one in. At first, it worked. I screwed the banjo fitting in, hooked up the hose, and the locker engaged but it was leaking quite a bit of air (banjo setup was still a bit loose) so I tightened it down further.

Well after that, the locker stopped engaging and all air leaks stopped. Previously, when it was working, air would come out of the open diff-breather vent. Now nothing was coming out at all.

In the tutorial, the bulkhead fitting should look something like this:

og7F0JS.png


Hard to get a good pic, but mine looks like this - basically it looks like whatever was in there got shoved down by the new fitting:

3pEo5JN.jpg


This makes sense when you compare the old fitting (on the left) to the new fitting (right) - the old fitting has more space for the copper line to fit, where as the new one almost has to be exact:

KgnlxKG.jpg


I took the diff out and did some "bench tests" and couldn't get the locker to engage at all, and worst off it seems like the end of the hose & fittings has oil on it when I take them out (that wasn't there before!). Air totally is making it to the end of the air line, but once it goes into the diff bulkhead, it just seems to be completely blocked from there.

tjLm1Wy.jpg



Any ideas on what to do next? I'm thinking of unscrewing the bulkhead fitting on top of the diff, trying to find the copper air line, and pulling it back through. I really don't want to open my diff up because it just got new fluid put in and was recently sealed by a professional, and I SUCK MAJORLY at applying RTV.

Thanks for reading if you got this far lol
 

jsexton

Need Bigger Tires
Location
Lewis Center, OH
you didn't break anything. Just take the cover off, push that copper line back up into place, replace the o ring and put the original bulk head fitting back on. Don't tighten it very much, finger tight is plenty.

And no worries about oil, doesn't make a lick of difference other than you might smell it some when you disengage the locker.
 

jsexton

Need Bigger Tires
Location
Lewis Center, OH
the bulk head o ring is Bulkhead is 1/8 3/32 5/16 Nitrile (Buna-n Durometer 70) which is a dash 104 o ring. Get one or several at the local hardware store or order a million for like $5 from mcmaster.

 

AlbatrossCafe

First Fill-Up (of many)
Location
Western WA
you didn't break anything. Just take the cover off, push that copper line back up into place, replace the o ring and put the original bulk head fitting back on. Don't tighten it very much, finger tight is plenty.

And no worries about oil, doesn't make a lick of difference other than you might smell it some when you disengage the locker.

Any tips for taking off the diff cover? It's pretty stuck on there from the RTV, and I don't necessarily wanna jam something in there and mar up the mating surface.

In the second pic, the square edges in the bottom-left & top-right overhang a bit, perhaps I lift up on those?

fB8xqJ5.jpg

xDZsEOJ.jpg
 

AlbatrossCafe

First Fill-Up (of many)
Location
Western WA
Holy crap it worked!! And I didn't actually even have to take off the diff cover!

I looked in the bulkhead again & saw the o-ring still in there, so I popped it out and then noticed the copper tube was still poking up just a bit. I unscrewed the bulkhead, pulled on the copper tube so it was sitting 1/4" higher, put the bulkhead back in & wired everything up. Bench-tested it and it is indeed locking & unlocking just fine! No leaks that I could hear either. I guess the only risk of this is that maybe the copper tube could be rubbing against the gears if it routed weirdly after I pulled it, but I barely had to pull it through to get it to work so I doubt it.

Thanks @jsexton for the help!

Tube barely visible:

rTXj0BT.jpg


Mostly intact o-ring:

9yZAUDL.jpg


Tube without bulkhead:

zLpGvxm.jpg


Just gonna use the quick-disconnect at the compressor from now on like I should have been doing this whole time...

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