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Old 05-10-2009, 05:34 PM   #1
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rear axle leaking after fluid change?? HOW?

hey gang.

I drained and refilled the rear diff fluid on my 1987 yj, I pulled the cover cleaned everything up, installed a new seal(previous owner used a tube of rtv..yuck!) put the cover back on and refilled with fresh fluid. I slowly filled through the fill hole until it just started to spill back out and I replaced the fill plug. Following morning, I have a small puddle under my left rear wheel. it's gear lube and I can see where it's leaking out of the backing plate.

Did I overfill the axle or is the bearing seal bad? It wasn't leaking prior to me servicing the rear axle, and I drained what appeared to be the correct amount of old lube out.

I can't understand how a seal can go bad so quickly like that. never saw this before. I've had rear seals go before, but never like this.

thanks!!

Jake

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Old 05-10-2009, 05:37 PM   #2
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possible it was overfull. seemslike every axle seal i replace the diff was too full. i'd park on level ground, and pull the fill plug. if any fluid drains out, its too full....let it all drain out from the fill plug, then replace it. clean the wheel off, and check again later. if it still leaks the seal is bad. the seal most likely will need to be replaced.

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Old 05-10-2009, 05:55 PM   #3
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I had the same when filled in too miuch fluid.
It comes out of the breather hose. Itīs behind the gas tank filler.
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Old 05-11-2009, 08:59 PM   #4
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still leaking a little bit even tho I have not driven it yet. But honestly it doesn't appear to be leaking as much. This is so weird.
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Old 05-11-2009, 09:03 PM   #5
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hey gang.

I drained and refilled the rear diff fluid on my 1987 yj, I pulled the cover cleaned everything up, installed a new seal(previous owner used a tube of rtv..yuck!) put the cover back on and refilled with fresh fluid. I slowly filled through the fill hole until it just started to spill back out and I replaced the fill plug. Following morning, I have a small puddle under my left rear wheel. it's gear lube and I can see where it's leaking out of the backing plate.

Did I overfill the axle or is the bearing seal bad? It wasn't leaking prior to me servicing the rear axle, and I drained what appeared to be the correct amount of old lube out.

I can't understand how a seal can go bad so quickly like that. never saw this before. I've had rear seals go before, but never like this.

thanks!!

Jake
Wait, where is the leak coming from? Is there a "wet" line coming from the cover area? Or is it coming from near the wheel?

How much is leaking? I guess I'm asking, is the leak slowing down because the diff is almost empty?

This could be incidental and not because you pulled the cover. Bad bearing seal maybe?
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Old 05-11-2009, 09:05 PM   #6
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Mine did the same thing, it appears I overfilled a some was coming out of the plug. It has only leaked a couple of spots, so I'm going to try and buy a new plug to make sure the old one wasn't damaged when I pulled it out.
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Old 05-11-2009, 09:17 PM   #7
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from the info i read, its his axle seal. the axle seal will not let all the fluid in the diff out, it can only leak to the level of the axle shaft. it slowed down hopefully cuz the over full fluid is leaving.

did you pull the plug to let out excess fluid like i said? or did you just leave it sit?
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Old 05-13-2009, 10:13 AM   #8
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UPDATE: after a couple of days of the truck sitting, it appears the leak has stopped. I did crack open the fill plug and i can still feel fluid inside with my finger. I'm going to drive it and keep an eye on it. If it still leaks, I pull the axle and change the seals. At least I won't need to pull the cover.

Jake
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Old 05-13-2009, 05:54 PM   #9
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you need to pull the cover to replace the axle seals. oh wait, 87 yj, non c clip d35 huh? never mind.
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Old 06-21-2009, 11:21 AM   #10
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Hi,

New here. I have a 1993 Jeep Wrangler. Just got some (free) '89 axles 4:10 with non c-clip. Very happy with the set up. I changed the fluid yesterday (not knowing whenit was done) and woke up to a leak on the D30. Not sure of the history. I opened the drain bolt and I would guess I over filled it. Now, only a little bit flow out. But bolt back in and this morning a few drops still drained. Nothing like yesterday.

Is it because I over filled it? Seal bad? Do I need to remove the diff cover to replace seal with my new setup?

Thanks
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Old 06-21-2009, 01:38 PM   #11
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Quote:
Originally Posted by Jeep4cern View Post
Hi,

New here. I have a 1993 Jeep Wrangler. Just got some (free) '89 axles 4:10 with non c-clip. Very happy with the set up. I changed the fluid yesterday (not knowing whenit was done) and woke up to a leak on the D30. Not sure of the history. I opened the drain bolt and I would guess I over filled it. Now, only a little bit flow out. But bolt back in and this morning a few drops still drained. Nothing like yesterday.

Is it because I over filled it? Seal bad? Do I need to remove the diff cover to replace seal with my new setup?

Thanks

Where is it leaking from? The diff or the axle tube?
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Old 06-21-2009, 02:04 PM   #12
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Where is it leaking from? The diff or the axle tube?
Diff.
It seemed to have stopped. Not 100%. I am going to check the diff and make sure there is oil in there still as well.
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Old 06-21-2009, 02:11 PM   #13
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Did you use a gasket when you resealed the cover or rtv or both?

Could very possibly be it didn't seal all the way.
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Old 06-21-2009, 03:15 PM   #14
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Did you use a gasket when you resealed the cover or rtv or both?

Could very possibly be it didn't seal all the way.
It's leaking from where the tire is. Not the diff cover. I did check and there is still plenty of fluid in there. Itstill flow out a small out when the bolt is removed. I also noticed a small drip again. My guessestimate is its over full still?
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Old 06-21-2009, 07:40 PM   #15
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Just checked. Still a small drip. I assume once its all out of the axle, it will stop since the fluid is below the axle in the diff?
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Old 06-21-2009, 08:27 PM   #16
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Some of the axles will leak a little bit if there is indeed overfill. My 89 yj did the same thing for nearly a week before it stopped dripping. The seal was fine, but Im guessing its a rudimentary self correction. It should stop after a while. I got tired of it dripping myself and really ran it ragged on the hills and desert. Either dirt stopped the leak like a blood clot or its finally all balanced. But that seemed to work for me.
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Old 06-21-2009, 09:45 PM   #17
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Fair enough. My theory is it will stop once it's all out of the tube as the gear oil is now below the drain bolt a pinch now. The jeep is actually level too. lol. But, it still rolls on out.
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Old 06-22-2009, 07:29 PM   #18
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I've put 300 miles or so since my leak and the backing plate is still dry and I still have plenty of fluid in the diff itself. Now if I can only find a 3.07 rear diff for an 87 yj to replace my growler, I'd be all set..................
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Old 06-22-2009, 07:30 PM   #19
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I've put 300 miles or so since my leak and the backing plate is still dry and I still have plenty of fluid in the diff itself. Now if I can only find a 3.07 rear diff for an 87 yj to replace my growler, I'd be all set..................
i scrapped one a couple months ago....does that help?

but it sounds like you may just need some bearings.
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Old 06-22-2009, 09:12 PM   #20
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I've put 300 miles or so since my leak and the backing plate is still dry and I still have plenty of fluid in the diff itself. Now if I can only find a 3.07 rear diff for an 87 yj to replace my growler, I'd be all set..................
I have a D35 with a 3:07 for sale

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