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Thread: jag rear leak

  1. September 12th, 2004, 01:31 PM #1
    homer
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    jag rear leak

    I have a slow leak in the differential that is coming from a failed gasket or more likely from the breather valve in the rear cover plate. While I was wiping off some fluid today to try and determine where the leak was coming from I noticed that the breather is very lose where it attaches to the cover plate. I dont think there is a way to tighten the breather without taking off the cover and I am hesitant to run the car if a bolt comes loose on the inside of the differential. Before I make a huge mess and remove the cover plate I wanted to check to see if anyone has had such a problem and could offer up the simple solution. Thanks.
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  2. September 12th, 2004, 06:02 PM #2
    Poorboy
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    Homer,
    There is no bolt inside holding the breather. It screws into the cover. You can unscrew the pipe out of the elbow, then tighten the elbow. You might want to use some sealant on the threads of the elbow.
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  3. September 12th, 2004, 06:45 PM #3
    homer
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    thanks - save me a messy job -- in terms of sealant was thinking of loctite blue?
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  4. September 12th, 2004, 08:34 PM #4
    Poorboy
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    Loctite blue is not a sealant. Use teflon tape or liquid teflon.
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  5. September 13th, 2004, 05:43 AM #5
    weaver
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    Homer, how about giving us a clue who you are and whos car you have, it always helps when I know the car.

    Alan
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  6. September 13th, 2004, 06:30 AM #6
    casaleenie
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    and then again it could be a failed seal....

    AL
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  7. September 13th, 2004, 09:53 AM #7
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    Russ Dickey
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    Homer: while your under there, you might as well check all the bolts on the rear diff. I also recently had some leaking and discovered that I had a few loose bolts on the rear cover as well as on the front cover where the input shaft enters the differential unit. Tightened them up, wiped it all down, and no more leak!

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  8. September 25th, 2004, 06:32 PM #8
    homer
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    Found the reason for the leak -- the elbow fitting fell out of the cover plate with 1/4 turn -- turns out the threads on the fitting and the coverplate were stripped -- tried tapping the hole but the flange inside the cover plate prevented the tap from going in far enought to rethreat the hole -- anyone have a source for a new rear coverplate and fittings?
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  9. September 25th, 2004, 07:35 PM #9
    homer
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    Found a replacement cover from summit for $30 - but it does not have a breather tube -- is this critical?
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  10. September 25th, 2004, 08:31 PM #10
    Poorboy
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    I would think if it needed one to start with it would still need one. Unvented it might push fluid past the seals when it warms up.
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  11. September 25th, 2004, 09:31 PM #11
    clayfoushee
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    Yeah, there is a thread going on elsewhere about Kirkham (Jaguar-knockoff) stainless steel differentials leaking b/c they designed the vent incorrectly. They've gone back to the original Jag design.....maybe a case where the English got it right the first time?

    I wonder why Summit would be selling an unvented cover?

    Clay

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  12. September 27th, 2004, 05:48 AM #12
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    nolastyankee
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    The rear end in the Jags were actually made by both Dana and Salisbury. Standard equipment on all Uniques that I have seen is the more common Dana rear end, I think the number is a Dana 44. Needless to say, Dana differentials are found in lots of cars from Chryslers to Jags, and in between IRS units and live axles. Standard issue live axles (that I am familiar with anyway) don't have breather tubes.

    Given that the diff is only filled to the breather hole, there is two plus inches of space to the top of the housing, so I am having trouble seeing how you would push fluid out at elevated temps unless there is enough air expansion from the heat that significant pressure develops. Can someone with more expertise help me (us) understand why this would need to be vented?


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  13. September 27th, 2004, 06:28 AM #13
    Poorboy
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    You might better check again about live axles not having breathers. I just looked under a Ford Ranger, Ford F150, Jeep CJ 5 (both ends), Chevy 1500, they all had breathers on them.
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  14. September 27th, 2004, 06:45 AM #14
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    Brent
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    If for no other reason than condensation I would always vent the housing.



    Brent
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  15. September 27th, 2004, 06:46 AM #15
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    eliminator
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    Poorboy you are right on. Put a unvented cover on [V]and start putting a drip pan under it, IMMEDIATELY.

    Rick
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  16. September 28th, 2004, 05:53 AM #16
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    nolastyankee
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    I guess that I need to have my eyes checked!

    Going back to the original question, if a breather is a must, under what situations would an unvented cover be used? There are plenty available out there...

    Unique 9122 - 289 FIA Cobra - The Legendary "Spence" Car
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