D90 Rear Inner Axle seal? - Defender Source
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  #1  
Old July 7th, 2009, 10:16 PM
Gibson04
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Justin Church
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D90 Rear Inner Axle seal?

I have diff fluid dripping down the inside of my rear driver's side brake rotor. It's enough to put several spots on the concrete as well as rust proofing the undercarriage.

I have searched and havent found a definitive answer.

Does it sound like the inner seal?

Please point me in the direction of a decent writeup of replacement.

Thanks in advance
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  #2  
Old July 7th, 2009, 10:53 PM
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First, unclog your breather tube and make sure it is clear. Then go down the list of faults with the most reasonable suspect being the inner seal.
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Old July 8th, 2009, 09:56 AM
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Robert Dassler
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After you unclog your breather tube as Ron suggested, you can also convert to wet hubs by removing the inner seals and replacing the hub seals with part# RTC3511. It is a much more robust seal with dual lips.
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  #4  
Old July 8th, 2009, 12:07 PM
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You can use the RTC3511 with grease also.
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  #5  
Old July 8th, 2009, 01:10 PM
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Quote:
Originally Posted by Roadsiderob
After you unclog your breather tube as Ron suggested, you can also convert to wet hubs by removing the inner seals and replacing the hub seals with part# RTC3511. It is a much more robust seal with dual lips.
I second that!
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  #6  
Old July 8th, 2009, 01:22 PM
Gibson04
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Justin Church
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Thanks Guys....


I am planning on taking the banjo bolt loose tonight that holds the breather tube on and making sure it is not clogged. then refit and drive on the highway abit to see if slows the leak down any. To get to the inner seal ....I am guessing that I will have to pull the halfshaft, take the brake caliper off and then remove the entire hub?

what size is the hub nut? Im not sure if I have a socket that big.

Justin
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  #7  
Old July 8th, 2009, 01:57 PM
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Quote:
Originally Posted by Antichrist
You can use the RTC3511 with grease also.
I second this. No reason to go to wet hubs.

Follow-up Post:

Quote:
Originally Posted by Gibson04
Thanks Guys....


...

what size is the hub nut? Im not sure if I have a socket that big.

Justin
Hammer and chisel or channel locks.
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  #8  
Old July 8th, 2009, 05:12 PM
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Its a 52mm.
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Old July 8th, 2009, 06:52 PM
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It will eventually stop leaking on its own.[img]images/smilies/happy.gif[/img]
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  #10  
Old July 8th, 2009, 07:09 PM
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Quote:
Originally Posted by evilfij
I second this. No reason to go to wet hubs.
Sure there is. When you have wet hubs and the hub seal goes, it leaks and you know it has gone......before you go wading. With grease filled seals, when the seal goes, you don't know and then you destroy the bearings in the middle of your off road trip.
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  #11  
Old July 9th, 2009, 06:46 AM
Gibson04
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Justin Church
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Update..... breather tube was completely blocked where the banjo fitting meets rhe hole in the bolt. I cleaned it all up and I will drive it to work to see if this has helped.

Thanks again foryour suggestions.
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  #12  
Old July 9th, 2009, 06:50 AM
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Andrew J. Hutton
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It seems this is obviously a common problem, instead of fitting a wading 'kit' would just drilling out the housings and tapping them NTP for a larger press-in breather make more sense? It would seem that just cleaning them out is asking for it to happen again.
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  #13  
Old July 9th, 2009, 08:42 AM
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Justin Church
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Im not sure but it looked as though the clog was caused by the mixture of diff oil and Uwharrie Dust. A few sprays of brake cleaner and problem solved.

I really can't imagine having to do this very often. Probably just years of buildup.
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  #14  
Old July 9th, 2009, 09:52 AM
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Did you blow air through it to make sure the line was not blocked at the top too?
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  #15  
Old July 9th, 2009, 10:22 AM
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I read somewhere that clogged breathers were also an issue when using an air-locker and contributed to seal failures (in the locker), either way I am going to open mine up a bit and make sure they vent nice and high.
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  #16  
Old July 9th, 2009, 10:58 AM
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Justin Church
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Brake cleaner and compressed air.......damn near blew the brake cleaner back on me once the clog came aloose.


Thanks for the tip Ron
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