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Thread: Sealants.

  1. #1
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    Sealants.

    I'm looking for input on sealant types for engine assembly. Surfaces include cast iron, steel and aluminium.
    In the past I've used Loctite Master Gasket and permatex instant gasket, but I'm looking to see what else is around. My Nissan engines were factory assembled with a grey silicone type sealant, but I have no idea what they might be.

    Orange RTV is readily available, it looks awful.
    Black RTV is readily availalbe, looks a little less awful.
    Clear silicone has been suggested, that would be a good choice for a bathroom, no way am I putting it in an engine.

    Anyone got a recommendation for me?

  2. #2
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    For the sump, Permatex The Right Stuff is the recommended sealant by LR. Expensive but good. I have also used it in several other places touched by oil such as the end seals of the valley gasket.
    Hylomar is recommended by LR for other gaskets and I use spray Hylomar on the valley gasket to head and manifold and timing case , and water pump gasket.
    I use Permatex Gold on the exhaust manifold to heads without gaskets . So far about 15Kk with no leaks.

    PS, I have found Permatex Black to go too hard on the end seals and become brittle.
    Regards Philip A
    Last edited by PhilipA; 11th November 2011 at 03:24 PM. Reason: more info

  3. #3
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  4. #4
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    i use this most of the time, well mainly because i get it for free...
    1986 Range Rover Hiline
    2004 D2 TD5

  5. #5
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  6. #6
    grant medwin Guest
    loctite 510 is what we use its great on everything , excess wipes off easy. I biuld caterpillar underground mining loaders and use it all the time.

  7. #7
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    all good stuff..

    I also use loctite #3, aka permatex, aka hylomar, aka aviation form a gasket, aka.....
    Dave

    "In a Landrover the other vehicle is your crumple zone."

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  8. #8
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    Generally there isn't 1 product that will do it all and at best practice. Just pick a known brand like loctite or permatex, that is convenient to you, go through their product guide and use what is best suited to the application. The colours are not there for looks, but to identify the product type within a given brand. I'd pick performance over colour every time. Sticking to one brand will prevent confusion, as competing brands have same colour with different specifications. Also you may choose to stick with one type of sealant ie anerobic etc

  9. #9
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    Three bond make a great range of sealants. The downside is it is a bit exy. Best I have used though. Beats Permatex, Loctite and all of the other RTVs hands down.
    It is used widely in the bike industry.
    2011 Discovery 4 TDV6
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  10. #10
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    Wurth 250 comes in grey, white and black. We use it for everything; sumps, transmission cases, exhaust manifolds to head, engine housings to block, etc etc etc.
    Expensive but can't fault it, so far has never failed to do its job..

    JC

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