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Thread: Wheeping diff plug

  1. #1
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    Wheeping diff plug

    Hi everyone,
    I have a whipping diff plug and want to know if its safe to apply some teflon or silicone "sealer" to the threads to stop it leaking.
    The brass plug is new, and the copper washer is new, but just wheeps Diff Oil, which upsets the boss.

    Also, is it permissible to apply any sealer to the coupling threads on the brake system? I have a slow leak from the Master cylinder reservoir. I've replaced the pipe, but it still leaks.

    thanks in advance,

    regards
    Jeff in sunny Perth

  2. #2
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    There are better sealants than the ones you suggest for the diff plug, but any will work, although they should not be needed. Perhaps the washer needs annealing.

    Sealant of any kind should not be used on brake junctions. If it leaks it is something wrong with the joint, either damaged joining bits, damaged thread, wrong type of flare etc.
    John

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    I use No. 3 Aviation Gasket Sealant on the threads of drain plugs. That stops them weeping (but not whipping or wheeping though).

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    Quote Originally Posted by p38arover View Post
    (but not whipping or wheeping though).
    You need antihistamines for those.
    ​JayTee

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    I use Loctite 569 or 577 hydraulic thread sealant on all the plugs & pipe fittings on my 80"

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    I use Loctite 515, on the drain plugs.

    whitehillbilly
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    I don't use anything but anneal the copper washer.
    It seems that most sealing washers are supplied dead hard and aren't suitable for sealing. If you re-use a washer they have usually hardened so anneal & re-use.
    I don't think I've ever changed the sealing washer on my Defender sump plug despite multiple oil changes.

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    Quote Originally Posted by gromit View Post
    I don't use anything but anneal the copper washer.
    It seems that most sealing washers are supplied dead hard and aren't suitable for sealing. If you re-use a washer they have usually hardened so anneal & re-use.
    I don't think I've ever changed the sealing washer on my Defender sump plug despite multiple oil changes.

    Colin
    One of the problems these days when replacing the "copper" washer is that they don't pass the magnet test. Annealing the old one makes perfect sense.
    ​JayTee

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    Jeff, for your weeping diff plug, (assuming it's the drain plug) I'd suggest Loctite 567 Master Pipe Sealant, applied to scrupulously clean threads on the plug. The threads on the diff housing will also need to be absolutely clean and dry. Have a look at Loctite's website to see the specs and applications for the various grades mentioned on this thread.
    Cheers, Rob S

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    Weeping Diff plug

    Many thanks Gentlemen,
    Advice greatly appreciated. I'll follow your advice and get it sorted over the weekend.
    nest wishes
    Jeff

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