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Thread: M1 Install Question

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    Default M1 Install Question

    I have oil leaking at rear of M1 on 2 trucks and have been advised by 2 sources to not use the rubber seals at front and rear of M1 but to use a bead of RTV black. I used RTV at the end of both rubber seals.
    Does anyone have any advice on this?
    Last edited by dstoots; 04-10-2016 at 07:49 PM.

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    I use the 1213 with cork, I always put a glob in the corners too of the right stuff.


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    Quote Originally Posted by WhiteRT View Post
    I always put a glob in the corners too of the right stuff.
    ^^^ This. The corners are usually the source of leaks.
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    Hook a shop vac up to the oil filler hole, run a bread of RTV where it's leaking and suck the RTV into the gap. Clean it as well as you can with brake cleaner and compressed air first, works like a charm.
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    Quote Originally Posted by Adobedude View Post
    Hook a shop vac up to the oil filler hole, run a bread of RTV where it's leaking and suck the RTV into the gap. Clean it as well as you can with brake cleaner and compressed air first, works like a charm.
    Great idea Dave
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    It wasn't my idea, but it's worked for me twice now, the Indy intake is stubborn to seal.
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    OG DRTC

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    Bead of rtv instead of an end gasket is how the edelbrock gaskets go on. But I've never had any issues with the 1213s either. The crappy rubber end seals are hitnornmiss. If you don't set manifold down perfectly straight and end up moving it a little it can cause it to not seal with rubber end seals.


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    How about 1213's and RTV on both surfaces of cork? Large glob on end of corks? Overkill huh?

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    Quote Originally Posted by dstoots View Post
    How about 1213's and RTV on both surfaces of cork? Large glob on end of corks? Overkill huh?
    You've got the idea. Little glob on top/bottom in the corners should do it.
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    You don't want the cork end gaskets holding the manifold up, and for that reason...They suck. I've been using nothing but RTV for years. Use some bolts with the heads cut off to guide the manifold down onto the RTV, but don't torque it down right away...Wait about 1 hour to let the RTV set up, then torque it down, and clean, clean and clean the mating surfaces before applying the RTV.
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    Unless you have shaved the mating surface of heads, or manifold the cork end gaskets won't "hold it up" any once torqued down. The cork will compress. And since it is a wide surface it seals good. No need for RTV on top or bottom of it, just a little in the corners. Doesn't take much, just enough to fill the void between cork end seals and the side gaskets.


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    Received my 1213's today, cut heads from guide bolts, will install tomorrow with real thin over and under cork, thin coat around water jackets, glob at ends of cork. Use of guides will make a big difference.
    Thanks to all who responded.
    Dick

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    Quote Originally Posted by dstoots View Post
    Received my 1213's today, cut heads from guide bolts, will install tomorrow with real thin over and under cork, thin coat around water jackets, glob at ends of cork. Use of guides will make a big difference.
    Thanks to all who responded.
    Dick
    You will need to notch the bolt holes on the side gaskets of the 1213s.


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    Quote Originally Posted by dstoots View Post
    Received my 1213's today, cut heads from guide bolts, will install tomorrow with real thin over and under cork, thin coat around water jackets, glob at ends of cork. Use of guides will make a big difference.
    Thanks to all who responded.
    Dick
    If you are using RTV under/on top of the cork ends, don't wait a second to torque it all down.
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    The thing I liked best about the 1213s was that you didn't need to use a lot of RTV on them to get a good seal making for easy clean up if you ever had to pull manifold in future. Putting RTV on the cork end gaskets, and around coolant ports is overkill and will make it harder to get manifold off and clean surfaces in future.


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    Quote Originally Posted by hskr View Post
    The thing I liked best about the 1213s was that you didn't need to use a lot of RTV on them to get a good seal making for easy clean up if you ever had to pull manifold in future. Putting RTV on the cork end gaskets, and around coolant ports is overkill and will make it harder to get manifold off and clean surfaces in future.
    After looking at cork I found that it had sticky tape on one side to hold it in place so I will not use RTV over and under them. I will use a glob at ends of cork. Thanks HSKR

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