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Thread: Help with Front Diff Pinion Seals

  1. 4th February 2013, 08:38 PM #1
    Jock The Rock
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    Help with Front Diff Pinion Seals

    Gday

    Just in the process of going over my front diff to fit into my new project Landy

    It's a '95 Diff from a Defender 110

    Through a matter of course I decided to replace the pinion seal seeing as I've replaced nearly everything else.



    The brown seal on the right in the one I removed, it measures 44.45x69.85x14.5. This seal is (I beleive) the correct seal that should be fitted, although I have never seen one like this before. There is a slight step in the pinion housing so that when this seal is installed it butts up against the step and the seal cannot be installed too deep. Once installed it sits flush with the top of the pinion housing

    Please note although this diff hasn't been driven on in probably 3 years it didn't look to be leaking

    The black seal on the left is the replacement seal I was sent. Part no FTC5258. I have fitted several of these seals before on my old Defender. From experience they don't work. Religiously they will leak after 5000kms. I have tried various depths, double checked and triple checked and they still bloody leak. This seal measures 44.45x69.85x9/13.5. It is noticeably thinner and when tapped in and sitting on the shoulder it appears too deep as the outer lip doesn't run on the mud shield on the output flange.

    My question is can anyone tell me the Landrover part number for the pinion seal on the right, the brown (I'm assuming Viton) seal that actually works

    At the moment I have one of the fellas at my local bearing and seal shop trying to match it up with an off the shelf seal

    Thanks
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  2. 4th February 2013, 08:44 PM #2
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    Bearman
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    Jock I think you will find the brown one on the right is the genuine FTC5258 and the black one is a generic aftermarket replacement.
    Cheers......Brian
    1985 110 V8 County
    1998 110 Perentie GS Cargo 6X6 ARN 202516 (Brutus)
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  3. 4th February 2013, 09:13 PM #3
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    justinc
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    Jock, I never have issues with the FTC5258 Corteco brand seal.

    I use the pinion flange to seat it dead square by doing it up using the mudshield to press it in. I then remove the pinion flange, and refit the old seal, fit the pinion flange again and do it up gently a few mm to provide clearance between the mudshield and the seal outer lip. I then remove the pinion flange again, toss away the old seal and reinstal the flange. I use a decent silicon in behind the washer, toss out that useless felt washer.

    JC
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  4. 4th February 2013, 09:37 PM #4
    Davo
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    Quote Originally Posted by justinc View Post
    Jock, I never have issues with the FTC5258 Corteco brand seal.

    I use the pinion flange to seat it dead square by doing it up using the mudshield to press it in. I then remove the pinion flange, and refit the old seal, fit the pinion flange again and do it up gently a few mm to provide clearance between the mudshield and the seal outer lip. I then remove the pinion flange again, toss away the old seal and reinstal the flange. I use a decent silicon in behind the washer, toss out that useless felt washer.

    JC
    21 years after first struggling with this, and finally I learn the best way to do it!
    At any given point in time, somewhere in the world someone is working on a Land-Rover.
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  5. 5th February 2013, 05:30 AM #5
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    camel_landy
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    FWIW - The only times I've had problems with the seals is either when the breather is blocked or the pinion itself is worn.

    M
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  6. 5th February 2013, 05:33 AM #6
    Jock The Rock
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    Quote Originally Posted by Bearman View Post
    Jock I think you will find the brown one on the right is the genuine FTC5258 and the black one is a generic aftermarket replacement.
    Didn't even think of that, thanks I'll order a genuine one

    And in the mean time I'll try Justin's technique

    Thanks for the replies
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  7. 5th February 2013, 01:08 PM #7
    Davo
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    Quote Originally Posted by camel_landy View Post
    FWIW - The only times I've had problems with the seals is either when the breather is blocked or the pinion itself is worn.

    M
    . . . Or the seal dates from the '60s. But otherwise it's usually been the pinion flange and I've either Speedi-Sleeved it or bought a new one. That always does the job. At least it's easy on a Rover diff. A Salisbury is a pain.
    At any given point in time, somewhere in the world someone is working on a Land-Rover.
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  8. 6th February 2013, 05:05 AM #8
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    camel_landy
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    Quote Originally Posted by Davo View Post
    ..A Salisbury is a pain.
    Nah... Just mark it & count the number of turns.

    M
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  9. 18th March 2013, 07:49 PM #9
    Jock The Rock
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    Quote Originally Posted by Bearman View Post
    Jock I think you will find the brown one on the right is the genuine FTC5258 and the black one is a generic aftermarket replacement.
    Just received my genuine seal in a genuine Landrover bag, it's the same as the aftermarket replacement
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  10. 18th March 2013, 11:38 PM #10
    Davo
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    No surprise . . . at least it's only a seal. I had the same thing happen with a spendy genuine viscous clutch!
    At any given point in time, somewhere in the world someone is working on a Land-Rover.
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