intake manifold not sealed
Thread Starter
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Mountain Pass
Joined: Jan 2001
Posts: 227
Likes: 1
intake manifold not sealed
Hi everybody, I´m new in this forum
I have a `60 F100 with a 400 engine.
My problem is the "S" formed rubber gasket at the front and
rear end of the manifold to block.
They don`t fit proper and it´s needed to add liquid gasket,
but after some time the leak is back and the engine breathes
air, especially at the front end.
Meanwhile I`m tired of removing the distributor and lift the
manifold .....
Is there a technique to solve this problem definitive, except
making an engine swap ?
Thanks for your help,
be patient with my english, Tom from Germany
I have a `60 F100 with a 400 engine.
My problem is the "S" formed rubber gasket at the front and
rear end of the manifold to block.
They don`t fit proper and it´s needed to add liquid gasket,
but after some time the leak is back and the engine breathes
air, especially at the front end.
Meanwhile I`m tired of removing the distributor and lift the
manifold .....
Is there a technique to solve this problem definitive, except
making an engine swap ?
Thanks for your help,
be patient with my english, Tom from Germany
Senior User
Joined: Jan 2004
Posts: 163
Likes: 0
From: Moose Jaw, Saskatchewan
I hate to say it but your goingto have to take your intake of again,but this time throw those gaskets away,Ipersonaly don't know of any that realy seal properly.Lay agood bead of sealant on both ends of the intake, make sure you get into the corners where the head and intake meet the block,or they will leak again let it sit for about 15 min,your prbably going to have to ghange your gaskets that go betweem your heads and intake,I hope thi helps if I've missed any thing pleas somebody don't hesitate to jump in and correct me.
Postmaster
Joined: Jun 2003
Posts: 4,191
Likes: 0
From: WA
Yep, lay a bead of rtv silicon about 4 or 5mm thick along the front and rear edges before you put the pan gasket down. Also make sure to clean that surface well to remove any existing gasket residue, and wipe it with lacquer thinner to get it oil free. When you torque the manifold back down you should see abit of RTV squeeze out.
Senior User
Joined: May 2003
Posts: 160
Likes: 0
From: Benbrook, Texas
Just to add to the good RTV advice, let it form sort of a skin on the outside with the inside still gooey. I'm sure it's cold in Germany so this may take a while. When you can compress it lightly with your finger without it sticking (but it still has paste-like qualities) to you you're ready to set that manifold in place.
Speaking from unpleasant experience, none of your heads, block or manifold has been milled, right? As well, are you using windage tray and rubber intake gaskets? Any of the above could be making too big a gap for RTV to seal.
This is my first time advising, and not asking a question, so veterans be gentle.
Robert Booth
'78 Ford F-150 Explorer
Arlington, TX
BTW, your English is great.
Speaking from unpleasant experience, none of your heads, block or manifold has been milled, right? As well, are you using windage tray and rubber intake gaskets? Any of the above could be making too big a gap for RTV to seal.
This is my first time advising, and not asking a question, so veterans be gentle.
Robert Booth
'78 Ford F-150 Explorer
Arlington, TX
BTW, your English is great.
Posting Guru
Joined: Dec 2002
Posts: 2,003
Likes: 2
From: chicago burbs
throw the "end seals" as far as you can! prolly not very far, but you get the idea. just one thing to add, i smear a thin film of RTV on the end sealing surface of the intake itself to make sure of good contact. sometimes even a small bead under the intake to join the larger bead on the block. never had one leak this way!
Thread Starter
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Mountain Pass
Joined: Jan 2001
Posts: 227
Likes: 1
OK - thanks for your advice !
to tell something more of the work I did : of course I removed every rest of gasket and cleaned every surface with nitro thinner.
I used a silicon RTV from Kent Ind. and layed it generously on the
end seals and and manifold - maybe not generous enough !
Maybe its a good tip from "califasbob" to wait some time until
it forms a skin.
By fitting the manifold again I can see, that the front end seal
wants to slip out of its figure long before I´ve reached the right
tightening torque.
And to answer that: block, heads or manifold have not been
milled - so far, because after fitting a set of Edelbrock Carb,
cam and manifold its time for some more compression !
Reading a lot of the messages here I think the right way is
a head milling with some flat pistons or a set of those legendary
australian 302c heads .... but where to hell will I find those here
in Germany !!
Anyway, thanks all of you for your help so far, if anybody reading
this has a good tip, let me know !
to tell something more of the work I did : of course I removed every rest of gasket and cleaned every surface with nitro thinner.
I used a silicon RTV from Kent Ind. and layed it generously on the
end seals and and manifold - maybe not generous enough !
Maybe its a good tip from "califasbob" to wait some time until
it forms a skin.
By fitting the manifold again I can see, that the front end seal
wants to slip out of its figure long before I´ve reached the right
tightening torque.
And to answer that: block, heads or manifold have not been
milled - so far, because after fitting a set of Edelbrock Carb,
cam and manifold its time for some more compression !
Reading a lot of the messages here I think the right way is
a head milling with some flat pistons or a set of those legendary
australian 302c heads .... but where to hell will I find those here
in Germany !!
Anyway, thanks all of you for your help so far, if anybody reading
this has a good tip, let me know !
Posting Guru
Joined: Dec 2002
Posts: 2,003
Likes: 2
From: chicago burbs
so you are saying that you have to do it again? do you understand not to use the end seals, just RTV? uncured RTV is slippery(silicone) as all get out and will spit the gasket every time when tightened.
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Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
For more information there are several threads here on how to seal the manifold that are very good.
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