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Unread 10-25-2013, 04:28 PM   #1
joshloudon
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04 Rubicon Rear Locker Leaking??

Whenever I try to lock the rear axle, the light just flashes on the dash. The front locks fine.
I've traced everything back with the wiring and everything is good.
I've traced all the air lines back and fixed all small leaks.
However, I have a HUGE air leak coming out of a "vent" line that is located on top of the drivers side axle tube. The tube comes out right next to the brake line distribution block that mounts to the axle.
I'm assuming that it's a vent line because the hose goes above the gas tank and runs up next to the gas tank filler neck and has a white "cap" on it that let's air out but keeps large particles out.
Any idea why the locker won't engage and the air is just bypassing through the vent hose? :confused

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Unread 10-25-2013, 04:30 PM   #2
number40Fan
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I would pop the diff cover off and have a look inside. I bet that you will find the problem.
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Unread 10-25-2013, 04:35 PM   #3
Jeffro06
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The hose is probably off the nipple it attaches to, I put a small zip-tie on mine just to keep it from coming off, since I heard that some eventually do.

But like number40fan said, pop off the diff cover and take a look....be sure to buy some new gear oil and drain the old first though, or you'll have a surprise when you pop the cover.
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Unread 10-25-2013, 04:44 PM   #4
joshloudon
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Thanks guys, I was going to take the cover off, but didn't know what to expect.
If it's just as simple as an airline coming off, then I will tie it up like you recommended jeffro.
I've already purchased Royal Purple gear oil and Lube Locker gaskets for it, so I'm all set!

Last edited by joshloudon; 10-25-2013 at 04:59 PM..
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Unread 10-25-2013, 04:49 PM   #5
number40Fan
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If you don't see anything obvious, try locking the diff while the cover is off and listen for the leak.
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Unread 11-03-2013, 08:10 PM   #6
joshloudon
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Well, didn't have much luck. Pulled the cover off, couldn't see any issues with the line. I engaged the locker and the air seems to be leaking within the locker somewhere. I can't physically pinpoint the location, but positive it is not coming from the line.
Is there some type of rebuild kit or something for them? Is the locker made by ARB? I'm not having much luck finding any information on it. Help!!
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Unread 11-03-2013, 09:00 PM   #7
Jerry Bransford
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That sounds exactly like what happened to my '04 Rubicon's rear locker, it sprang a small pinhole leak inside its internal bladder that is used to lock it up. Replacing the bladder inside the locker is not difficult, finding one may be a little more difficult but try Google's shopping site at www.froogle.com where I found two listed. I just happened to get one from a JF member who happened to have a used one on hand. New, the bladder is $150 or so.

The first photo shows the bladder itself with the old bladder still installed on the left, the replacement is in my hand. The second photo shows it installed... that nipple that leads under the bearing cap leads to it.

The part number for the air bladder, officially called an "Actuator, Air Locker" is 52104611AA.
rubiconlockerdiaphragm.jpg

rubiconlockerbearing2.jpg

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Unread 11-04-2013, 09:09 AM   #8
joshloudon
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Thanks Jerry! I will check it out any let you know.
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