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Thread: Dif cover gasket - RTV or no?

  1. #1
    Join Date
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    Question Dif cover gasket - RTV or no?

    There didn’t appear to be any type of sealant on this when I pulled it apart but I don’t know if I should use some or not. What do you do?

  2. #2
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    There would have to be something use rtv

  3. #3
    Join Date
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    1995 M3
    I use any quality (3M, permatex) non-hardening oil-resistant sealant that I have handy. I kinda like the brush-on stuff cause I can get a thinner application. Currently, I have a can of Permatex Aviation form-a-gasket #3, brush on!

    I also like permatext motoseal #1, it seams to peal off pretty easily at disassembly. I think this is what's currently on my diff cover.

  4. #4
    Join Date
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    no gasket...JUST RTV.

  5. #5
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    '95m3(Avus)/996tt/4.8is
    I have done my diff gasket TWICE now on the racecar (rtv only) and still moist/wet along the sides and bottom. Would output seals/flanges on the diff cause seepage while sitting?

  6. #6
    Join Date
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    I've grown to become a fan of the Permatex Anerobic sealer on rigid flat surfaces like water pumps, diff covers and oil pans.
    As long as the mating surfaces dont have deviations of over 015-020 its great, no squeeze out like RTV.

    https://www.permatex.com/products/ga...lange-sealant/
    jimmy p.


    88 E30 M3 Zinnoberot - street
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  7. #7
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    I use the Permatex in the green tube specifically made for gear oil. No gasket. Works perfectly.
    '95 M3 S54 Track Toy
    '19 X5 40i M-Sport
    '16 Cayman GT4
    ‘23 GR Corolla

  8. #8
    Join Date
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    Quote Originally Posted by jimmypet View Post
    I've grown to become a fan of the Permatex Anerobic sealer on rigid flat surfaces like water pumps, diff covers and oil pans.
    As long as the mating surfaces dont have deviations of over 015-020 its great, no squeeze out like RTV.

    https://www.permatex.com/products/ga...lange-sealant/
    Good find, I like!

  9. #9
    MINIz guy's Avatar
    MINIz guy is offline #buttstuff2k14 BMW CCA Member
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    rolls coal
    Permatex "The Right Stuff" on my diff cover without a gasket. Has been holding great going on 3 years now.

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