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exhaust manifold gasket leaking


 
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ken benfield
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PostPosted: Sun Jan 24, 2010 8:39 am    Post subject: exhaust manifold gasket leaking Reply to specific post Reply with quote

i changed exh. mani.gasket on 1950 8n ford side mount yesterday and it continues to leak exhaust(even worse now).any certain side of gasket to engine?the mani. had some corrosion where i am almost sure it is leaking(top left coner).engine side is smooth and clean.is there a "quick"fix for the corossion?can i have the mani."shaved"?or do i need to purchase new mani.?tks,ken
 
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Bruce (VA)
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Location: Old Church VA

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PostPosted: Sun Jan 24, 2010 8:52 am    Post subject: Re: exhaust manifold gasket leaking Reply to specific post Reply with quote

Make sure you know where it's leaking.

Use the correct clamp. An automotive muffler c-clamp will not work. You need a clamp made for the N. If you have the correct clamp, it has a top & bottom. Make sure you have the clamp on correctly; check out tip # 8, below.

Slide the tail pipe into the hanger clamp & then place the end of the exhaust pipe against the manifold. Look at it! Remember, the pipe will most always fit snugly to the OEM manifold w/o any problem, but a replacement manifold will likely not be the exact same size as the OEM manifold, so you will have some work to do. If it does not mate all the way around, put a broomstick down the pipe & into the manifold & gently bend the pipe until both surfaces mate snugly. If the exhaust pipe flange is bent, you will never get a good seal; check it out. The clamp is not a gasket; if the pipe & manifold do not mate tightly, it will leak. Do not try & hold the exhaust pipe against the manifold w/ your hand & while you tighten the clamp. Get out your floor jack & a block of wood; put the jack under the pipe to hold it tightly against the manifold. With the pipe jacked snugly and squarely to the manifold use your ĺ lb ball peen hammer and tap the pipe tight to the manifold flange all the way around. Its soft metal and this will only take about a minute. Tighten the clamp. (Don't get carried away w/ the jack or you will bend the pipe. Or, overtighten the clamp & snap it in two. BTDT).

Sometime the leak isnít at the clamp. Itís from the manifold. Look for smoke tracks. If the block is badly pitted, (usually around # 4) you will have problems; get out the hi-temp metal epoxy. (Not JB Weld) VersaChem's exhaust manifold repair, or ThermoSteel, is said to be good to 2000 degrees. Clean the area real well with brake cleaner, put a little epoxy on it, put some wax paper over it and bolt down the manifold. After it dries take off the manifold and take a die grinder and clean the epoxy that might squish into the port. Look at the manifold, again around # 4. (as in the picture) If itís pitted & burned, it isnít going to seal. Time to surface it or get a new one. At the price of machine shop work these days, it's probably going to be cheaper to get a new one.

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ken benfield
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PostPosted: Sun Jan 24, 2010 12:36 pm    Post subject: Re: exhaust manifold gasket leaking Reply to specific post Reply with quote

i'm pretty sure this option of using some thermoseal will work.it's not much metal gone.tks.to bruce(va)
 
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Bruce (VA)
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PostPosted: Sun Jan 24, 2010 1:54 pm    Post subject: Re: exhaust manifold gasket leaking Reply to specific post Reply with quote

You're welcome; glad to help.
 
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Hobo,NC
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PostPosted: Sun Jan 24, 2010 5:34 pm    Post subject: Re: exhaust manifold gasket leaking Reply to specific post Reply with quote

ken benfield wrote:
(quoted from post at 17:39:26 01/24/10) i changed exh. mani.gasket on 1950 8n ford side mount yesterday and it continues to leak exhaust(even worse now).any certain side of gasket to engine?the mani. had some corrosion where i am almost sure it is leaking(top left coner).engine side is smooth and clean.is there a "quick"fix for the corossion?can i have the mani."shaved"?or do i need to purchase new mani.?tks,ken


I would spec it would be extremely difficult to fudge up a zaust gasket replacement,,, I spec you need to look at the block and spend yer money for a new Chinese manifold...

Its rare a old manifold can be resurfaced and have enuff seal'n surface left to hold a seal,,, new manifolds are a deal...

WARNING Shocked all I know I read on the Internet,,, do it enuff and you can become a guru also,,, not responsible for damages,,, I read it and just pass it along,,, proceed with caution
 
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