| [GMCnet] MANIFOLD GASKET LEAKS [message #112838] |
Sun, 23 January 2011 21:28  |
Charles Aulgur
Messages: 78
Registered: March 2006
Karma: 0
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Member |
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: 6
Date: Sat, 22 Jan 2011 22:11:06 -0600
From: Ken Burton <n9cv@comcast.net>
>
Content-Type: text/plain; charset="ISO-8859-15"
Charles Aulgur wrote on Sat, 22 January 2011 21:54
> Bob, take a look at the joint where the exhaust manifold connects to
> the exhaust pipes on each side. A lot of muffler shops do not
> replace the special spring-loaded bolts that came from the factory
> for this flange connection. This connection should have a round
> gasket with a spherical surface where it mates to the exhaust pipe.
> The special bolts used there should have a shoulder that limits the
> compression of the springs to a certain amount so the connection can
> flex when the exhaust system expands and/or the engine moves around
> on it's mounts. If this joint is not allowed to flex the engine
> movement and exhaust pipe expansion puts to much load on the
> manifolds and causes the manifold-to-head gasket to leak and erode
> the manifold surface. You can see what the original configuration
> looks like in the maintenance manual/parts book.
>
> Chuck Aulgur
> La Mesa, CA
> 76 Royale with great brakes
>
Chuck, I have always wondered about the connection. I have headers
and I do not have that spring loaded connection. Do you think that
this connection is required with headers installed?
--
Ken Burton - N9KB
Ken, I think you would have a better chance of not having manifold/
header gasket leaks with the spring loaded flange connection if it
reduces the loading on the manifold/header gasket connection. I know
there are a lot of people that don't use them. I have over 100K
miles on a set of headers that have been on two different engines and
I have never had a header gasket leak. I also use self locking bolts
to attach the header to the engine.
Chuck Aulgur
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| Re: [GMCnet] MANIFOLD GASKET LEAKS [message #112873 is a reply to message #112838] |
Mon, 24 January 2011 01:26  |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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| Charles Aulgur wrote on Sun, 23 January 2011 21:28 |
: 6
Date: Sat, 22 Jan 2011 22:11:06 -0600
From: Ken Burton <n9cv@comcast.net>
>
Content-Type: text/plain; charset="ISO-8859-15"
Charles Aulgur wrote on Sat, 22 January 2011 21:54
> Bob, take a look at the joint where the exhaust manifold connects to
> the exhaust pipes on each side. A lot of muffler shops do not
> replace the special spring-loaded bolts that came from the factory
> for this flange connection. This connection should have a round
> gasket with a spherical surface where it mates to the exhaust pipe.
> The special bolts used there should have a shoulder that limits the
> compression of the springs to a certain amount so the connection can
> flex when the exhaust system expands and/or the engine moves around
> on it's mounts. If this joint is not allowed to flex the engine
> movement and exhaust pipe expansion puts to much load on the
> manifolds and causes the manifold-to-head gasket to leak and erode
> the manifold surface. You can see what the original configuration
> looks like in the maintenance manual/parts book.
>
> Chuck Aulgur
> La Mesa, CA
> 76 Royale with great brakes
>
Chuck, I have always wondered about the connection. I have headers
and I do not have that spring loaded connection. Do you think that
this connection is required with headers installed?
--
Ken Burton - N9KB
Ken, I think you would have a better chance of not having manifold/
header gasket leaks with the spring loaded flange connection if it
reduces the loading on the manifold/header gasket connection. I know
there are a lot of people that don't use them. I have over 100K
miles on a set of headers that have been on two different engines and
I have never had a header gasket leak. I also use self locking bolts
to attach the header to the engine.
Chuck Aulgur
|
Yuk! Something else for me to go fix on the GMC.
My "free" welder will appreciate having to redo them again. I have been waiting for a week for him to do a 10 minute on weld job on some tow brackets I made for S-10 Blazers. They are sitting on his bench so he has to look at them every day. I guess I'll have him do it after it warms up here again.
Thanks
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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