04 Rubicon Rear Locker Leaking?? - JeepForum.com

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post #1 of 20 Old 10-25-2013, 04:28 PM Thread Starter
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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post #2 of 20 Old 10-25-2013, 04:30 PM
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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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post #3 of 20 Old 10-25-2013, 04:35 PM
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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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post #4 of 20 Old 10-25-2013, 04:44 PM Thread Starter
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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post #5 of 20 Old 10-25-2013, 04:49 PM
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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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post #6 of 20 Old 11-03-2013, 08:10 PM Thread Starter
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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post #7 of 20 Old 11-03-2013, 09:00 PM
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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.
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post #8 of 20 Old 11-04-2013, 09:09 AM Thread Starter
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Thanks Jerry! I will check it out any let you know.
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post #9 of 20 Old 03-23-2016, 09:06 PM
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Quote:
Originally Posted by Jerry Bransford View Post
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.
Hey, Jerry, don't mean to dig up an old thread but after much diagnosis, pretty sure my rear 2004 Rubicon that is new to me has a diaphragm leak, checked the internal and external hoses and connections, swapped connections to compressors since the rear kept cycling for 1.5 seconds with the key off and not the front so I swapped lines to test it, no dice. So my question is I'm going to re-gear anyways, how hard is the job of replacing the diaphragm and did it fix the blinking light problem and did the fix hold up over time? Funny part is the rear still locks, just blinks, buuuut when I go up a steep hill incline or a Back up a steep incline, the light goes solid....
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post #10 of 20 Old 03-23-2016, 09:17 PM
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The used air bladder I bought from JF member Mudb8 and installed 4-5 years ago is still holding up fine. Replacing the air bladder once the locker has been removed is easy and very straight forward.

Here's a pic of the locker and air bladder from when I replaced it.
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post #11 of 20 Old 03-23-2016, 11:10 PM
fishandwheel
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Quote:
Originally Posted by Jerry Bransford View Post
The used air bladder I bought from JF member Mudb8 and installed 4-5 years ago is still holding up fine. Replacing the air bladder once the locker has been removed is easy and very straight forward.

Here's a pic of the locker and air bladder from when I replaced it.
Ok Cool, I am a gear dummy. I will be regearing here in the next few weeks, is it easy to get this done at this time? what kind of extra time should I be looking at while regearing to swap out the bladder? Thanks again
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post #12 of 20 Old 03-23-2016, 11:39 PM
fishandwheel
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Ok so I punched in that part number and it says it's a front differential actuator for a transfer case for a yj according to the subscription.....don't know if it happens to be the same part here is the link http://m.summitracing.com/parts/cwa-...Q2zhoCK23w_wcB
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post #13 of 20 Old 03-24-2016, 05:13 AM
billdacat
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It looks like a typo...YJ's didn't have the Rubicon OEM locker. Hey Jerry, is that same actuator good for the front???
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post #14 of 20 Old 03-24-2016, 09:14 AM
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Quote:
Originally Posted by fishandwheel View Post
Ok Cool, I am a gear dummy. I will be regearing here in the next few weeks, is it easy to get this done at this time? what kind of extra time should I be looking at while regearing to swap out the bladder? Thanks again
Once the locker is out, it only takes a minute or two to swap the air bladder.

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post #15 of 20 Old 03-24-2016, 01:04 PM
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Somebody at Summit copy and pasted the description from the front axle disconnect vacuum actuator for a YJ to the Rubicon locker diaphragm product page


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