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Thread: Ashcroft HD CV shafts and front diff seals - leaking?

  1. #61
    Join Date
    Feb 2011
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    Quote Originally Posted by Tombie View Post
    What finish are the sealing surfaces machined to?
    There's different finish options? Not something I was aware of/thought of. I took the old one, the axel shaft and two new seals in with me so that they would have a complete idea of how it all fits and functions, as well as for measurements.

  2. #62
    Tombie Guest
    If the finish is too rough (layman terms) it will tear the sealing lip.

    I ask because (may just be camera / light) it appears the machined parts are showing visible tool marks.

    Run your finger nail across - if you can feel small ridges it is too rough.

  3. #63
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    The finish on the new mudshields looks to rough to me too. If the surface roughness is not "lip seal" rated (polished well enough) the seal will fail in no time.

  4. #64
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    might be... mine was made with a "rectifier"/grinding machine(i dunno how it's named in english) but the surface of the shield was almost like glass.
    Discovery Td5 (2000), manual, tuned

  5. #65
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    Ok, it seems I need to polish up the shields then...

  6. #66
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    Quote Originally Posted by twr7cx View Post
    Ok, it seems I need to polish up the shields then...
    Results of my initial efforts:



    Running my finger nail over the surface now it feels smooth and doesn't catch.

    I started with 220, then 320, 400 and finished off with 600. Going to run it on the buffer wheel to finish.

    Still need to the main collar of the shield for the dust seal lip. I've got a bit of an idea for doing that part.

  7. #67
    Tombie Guest
    Good work!

  8. #68
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    I used a bolt, nut and some washers to fit the shields into the drill press and then sand them and polish:





    Visibly there is still some lines. But I cannot detect/feel these at all:



    I've taken a chance and fitted the new shield to the drivers side. Time will tell. I'll do the passenger side when the current seal starts to leak.

  9. #69
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    well done.... i have a strong feeling that it will not leak, i have over 2000km now and still dry... that CV joint area haven't been so dry for many months before
    Discovery Td5 (2000), manual, tuned

  10. #70
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    I just had a flick back through this thread. I last did the passenger side seal on the 5th April. I fitted a Britpart brand seal. It is not leaking yet. It's probably survived 3,000km so far. I've got the new shield here and waiting for when it's ready!

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