Reasons my rear diff vent tube is leaking gear oil? - JeepForum.com

 
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post #1 of 14 Old 11-01-2011, 08:16 PM Thread Starter
phmaris
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Reasons my rear diff vent tube is leaking gear oil?

All of a sudden, my rear differential vent tube is leaking gear oil pretty bad. It is pouring down the frame rail and leaving a baseball size puddle on the driveway after sitting for the day.

I have no clue why this would happen all of a sudden. I have changed the oil less than a year ago. I have not driven through water at all recently.

My seal is leaking very minimally. Just a trace of oil about two inches down the diff from the seal.

Anyone have any ideas?

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post #2 of 14 Old 11-02-2011, 12:08 AM
EricsXJ
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What rear end, D35 or 8.25? Have you done any work to it or added anything like a locker or different carrier other than stock?

Eric
2000 XJ "PROJECT RUBICON" 3-link front / 4-link rear / coilovers / running 37's on Dana 60s
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post #3 of 14 Old 11-02-2011, 12:40 AM
Wearingthin
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Positive it's diff fluid and not brake fluid leaking from the hose near the frame rail?

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post #4 of 14 Old 11-03-2011, 12:04 PM Thread Starter
phmaris
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Its a stock 8.25 now with a rockcrusher diff cover. Im pretty sure its not brake fluid. It smells and looks like gear oil to me and its pretty easy to trace the leak up to the vent tube.

Going to throw it up on a lift and look at it more tonight but Im pretty sure its coming out of the vent tube... and a lot of it
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post #5 of 14 Old 11-03-2011, 12:16 PM
Wearingthin
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Quote:
Originally Posted by phmaris View Post
Its a stock 8.25 now with a rockcrusher diff cover. Im pretty sure its not brake fluid. It smells and looks like gear oil to me and its pretty easy to trace the leak up to the vent tube.

Going to throw it up on a lift and look at it more tonight but Im pretty sure its coming out of the vent tube... and a lot of it

I'm not sure why it would happen all of a sudden, but when you put your new diff cover on, did you put the stock amount of fluid back in or did you fill it up to the fill plug?

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post #6 of 14 Old 11-04-2011, 08:49 AM
EricsXJ
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I believe this will fix your problem....

Unscrew the breather tube fitting from the axle housing. (You do not need to disconnect any brake lines.) It will look like this:



Then with a hacksaw, dremel, or suitable cutting tool, cut off the lower section of the fitting that has no threads. It will shorten it about 1/4". Then thread the fitting back in the housing and you should be good to go.

Eric
2000 XJ "PROJECT RUBICON" 3-link front / 4-link rear / coilovers / running 37's on Dana 60s
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post #7 of 14 Old 11-19-2012, 11:15 PM
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I have this exact same issue going on with my XJ as well and its driving me nuts!... Phmaris, did this fix your issue? if so, so I can do it too.. Hey EricsXJ, how did you figure this out?
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post #8 of 14 Old 11-20-2012, 02:41 PM Thread Starter
phmaris
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Quote:
Originally Posted by Gonzo99XJ View Post
I have this exact same issue going on with my XJ as well and its driving me nuts!... Phmaris, did this fix your issue? if so, so I can do it too.. Hey EricsXJ, how did you figure this out?
It did stop. But all I did was change the fluid again and re-seal the cover with RTV again making sure it was super clean and made a good seal. Waited about 6 hours to ensure the RTV dried. Then refilled just up to the bottom of the fill hole. It hasn't leaked from the drain tube since. Still a mystery to me why it was leaking in the first place?
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post #9 of 14 Old 11-21-2012, 10:31 AM
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Quote:
Originally Posted by phmaris View Post
It did stop. But all I did was change the fluid again and re-seal the cover with RTV again making sure it was super clean and made a good seal. Waited about 6 hours to ensure the RTV dried. Then refilled just up to the bottom of the fill hole. It hasn't leaked from the drain tube since. Still a mystery to me why it was leaking in the first place?
I took off that fitting that Eric showed us, cleaned it thoroughly with brake cleaner, I put everything back together and it started leaking again after driving it for 10 miles... I drained and filled my rear diff like 2 months ago thinking that what would stop the leaking but no... it still did ever since.... i didnt overfill it or anything... I dont know what action to take next... any ideas?
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post #10 of 14 Old 11-21-2012, 11:28 AM
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The root of the problem should be that gear oil is not draining out of the tubes back into the differential housing. It collects in the tubes and pressure is forcing it out of the vent tube.

This is usually more of a problem when aftermarket carriers (ARB, Detroit) are installed. They recommend cutting additional drain passages to allow the oil to drain out of the tubes. If you have a stock open carrier it shouldn't be a problem. I wonder if the limitted slips are prone to this however.... What do you have?

Not that its a guaranteed fix but did you try trimming the vent tube fitting that I showed in the photo? Just curious, because I had seen that as a fix/remedy before. I trimmed mine as a preventative measure but didn't have this problem to begin with.

Eric
2000 XJ "PROJECT RUBICON" 3-link front / 4-link rear / coilovers / running 37's on Dana 60s
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post #11 of 14 Old 11-21-2012, 11:46 AM
bigbadduck
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I have a D44 with a trac lock and just regeared and I am a little bit of an issue with venting
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post #12 of 14 Old 11-21-2012, 11:57 AM
Gonzo99XJ
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Quote:
Originally Posted by EricsXJ View Post
The root of the problem should be that gear oil is not draining out of the tubes back into the differential housing. It collects in the tubes and pressure is forcing it out of the vent tube.

This is usually more of a problem when aftermarket carriers (ARB, Detroit) are installed. They recommend cutting additional drain passages to allow the oil to drain out of the tubes. If you have a stock open carrier it shouldn't be a problem. I wonder if the limitted slips are prone to this however.... What do you have?

Not that its a guaranteed fix but did you try trimming the vent tube fitting that I showed in the photo? Just curious, because I had seen that as a fix/remedy before. I trimmed mine as a preventative measure but didn't have this problem to begin with.
I have a Dana 35 stock... so if I trim the fitting... do u think itll fix for sure? Or is it a 50/50 situation?
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post #13 of 14 Old 11-21-2012, 12:00 PM
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Quote:
Originally Posted by Gonzo99XJ View Post
Or is it a 50/50 situation?
Yes...it either will or it won't

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post #14 of 14 Old 11-22-2012, 07:38 AM
94beachxj
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They say that vent tube was the main culprit on those "mystery" Nissan Titan Rearend Issues
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