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Thread: The Right Stuff-Permatex removal-Rear End Cover

  1. #1
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    The Right Stuff-Permatex removal-Rear End Cover

    Hi Guys,
    I have a 3 link 8.8 rear end in my MKIV.
    I installed a Moser Aluminum cover.
    I have a very small leak at the bottom of the differential.
    I mean small, about 1 drop, if that a week, but still a leak.
    I'm in the stage where I could remove the rear cover or rear end entirely now.
    I sealed the Aluminum cover to the rear end using Permatex, The Right Stuff.....so much for that.
    What should I do? leave it and check the fluid every month?
    Or try to remove the aluminum cover. I was told that The Right Stuff is very very hard to remove.

    Any ideas, suggestions and inputs would be appreciated.

    Thanks
    Martin

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    Seasoned Citizen NAZ's Avatar
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    33 Hot Rod Super Pro Drag Racer
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    I hate leaks too. Any of you with older BMW's know the gaskets are crap. They only recommend using a sealant on certain sections of the gaskets.
    For the last 10 years I've been using Hylomar on the complete gasket. It's hard to find locally, if it all.
    Recently I switched to Permatex 85420 that you can get at NAPA and probably other parts stores.
    It's compatible with oil, gas, coolant, etc.
    Easy to clean off if you ever had to.
    https://www.permatex.com/products/ga...lange-sealant/
    '33 Hotrod, #1047, delivered on 2/27/18, go cart on 9/24/18.
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    Senior Member CraigS's Avatar
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    I have had good luck w/ the right stuff but I no longer use it. Bought that $15 can, used it once, 3 months later I wanted to use it again and nothing would come out of the can. Anyway, doing the diff cover is a bit of a pain because the gear oil just keeps dripping from the rear. It slows but it's still there. I clean off the mating surfaces w/ acetone or brake cleaner, I use up a rag reaching into the diff and wiping out all the oil I can get. Quickly clean the bottom of the mating surface again, apply permatex ultra grey ( I like it's somewhat thicker consistency compared to blue or black), and bolt on the cover. I find it critical that the surface be absolutely dry when I apply the sealer. BTW run the sealer bead so there is a complete circle around every bolt hole.
    FFR MkII, 408W, Tremec TKO 500, 2015 IRS, DA QA1s, Forte front bar, APE hardtop.

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    In the past I also used the Permatex Ultra on the diff cover and always had a drip after a bit of time. I then found out about a specific Permatex Ultra made for gear oil. NO drips ever. I agree 100% with Craig, that the surface should be clean and dry prior to the sealants application.
    https://www.permatex.com/products/ga...-gasket-maker/
    You can get it on Amazon for $5.40

    Olli
    Last edited by Olli; 06-09-2019 at 07:45 AM.

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  8. #6
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    Thank you all for the inputs and links.

    Now, any help or input on getting the cover off????

    M

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    I have a rubber gasket on mine, no leaks - 15 years. Can't remember where I got it.
    David W
    Mkll 4874 built in 2004
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    I used the right stuff on an oil pan, and then had to get it off to change the pump. Used a couple of sharpened putty knives to walk around the pan until it broke loose.

    When the pan did come off, the gasket stayed with it, and there was a PERFECT impression of the bottom of the block. Used some rtv and the pan went back on without cleaning off the old gasket, or breaking it loose from the pan. No leaks in over a year.

    Depending on the application, the "Right Stuff" is not the right stuff.
    FFR 3319. On the road since 2002 with a lot of upgrades.

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    i.e.427's Avatar
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    i.e.427 is located in the Southern California Inland Empire. We help Factory Five customers and builders realize their dreams by providing assembly, fabrication and maintenance for their Factory Five projects.

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    Honestly for this kind of stuff I use Hondabond. It’s very thin and works great as a gasket dressing. You can get it at your local power sports place. Best part is that oils and fuel won’t dissolve it and it’s easy to clean off with a brush. Been using it for years and I have yet to have a gasket leak.
    Mk4, Moser M88 rear end, Eaton truetrak, Craft Racing 461 Windsor, MMR pro trans, Glennís 1,000 hp cobra fuel system and lots of other parts.

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    Is it a girdle or just a solid Al cover?

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    its a moser engineering aluminum 8.8" cover
    https://www.moserengineering.com/Rear-Covers.dept

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    Senior Member rich grsc's Avatar
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    I certainly hope you aren't use the fill hole as the level of oil you're running in the rearend? I don't like those covers as the fill hole is too high up the the cover, and you end up over filling. There is a plug at the front on the side that is the correct fill level. Perhaps you are over filling?

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  17. #14
    David aka Ducky2009 Ducky2009's Avatar
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    After removing your cover, use a straight edge to verify the cover isn't bent. Check around the bolt holes. Over-tightening could have bent it.
    Last edited by Ducky2009; 06-11-2019 at 06:20 PM.
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  18. #15
    Senior Member Avalanche325's Avatar
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    Quote Originally Posted by Olli View Post
    I then found out about a specific Permatex Ultra made for gear oil. NO drips ever.
    https://www.permatex.com/products/ga...-gasket-maker/
    You can get it on Amazon for $5.40

    Olli
    That is what used when my Moser rear leaked. Not a drop since!

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    Going to try to remove it this weekend. hope it comes off without to much issue.
    M

  20. #17
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    You should be able to tighten up the cap support bolts (the ones with the hex key in them) to pop the cover loose. It worked for me. Just go easy so as not to strip out the Al treads. If it doesn't want to pop free then keep some tension on those bolts and use a sharpened putty knife to loosen up the RTV and it should eventually pop free. Scott

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    Well, update....its off
    The Moser Al cover came right off
    The gasket and The Right Stuff RTV was another story on the rear end.
    2hrs of fine scraping and its all clean.
    Just Purchased a Lube Locker gasket-no sealant this time.
    Thank you all for the input and advise.

    Will feel better knowing there is no leak at all vs a drop a week.

    Martin

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