Getting a seal on a tubular exhaust manifold

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Mr Bridger
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Getting a seal on a tubular exhaust manifold

Post by Mr Bridger » Tue Aug 07, 2018 6:20 pm

I had to change my off side exhaust manifold about 18 months ago as the old one had cracked. The seal on No.1 cylinder has always been dodgy; after fitting it took lots of messing around to get it leak free. Now it's started blowing again.Obviously the alternator being right in the way doesn't help, but I seem to remember I even removed this to try and get the thing gas tight. Any tips for getting a good seal here?


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Getting a seal on a tubular exhaust manifold

Post by Coupe Racing » Tue Aug 07, 2018 6:37 pm

I would take the manifold off and check alignment across all the ports


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Getting a seal on a tubular exhaust manifold

Post by b.c.flat hat » Tue Aug 07, 2018 10:24 pm

I've the same with tubular headers, cured with two gaskets on 1 and 3, only one on 2(middle)😜



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Getting a seal on a tubular exhaust manifold

Post by Mr Bridger » Wed Aug 08, 2018 11:05 am

Thanks for the replies. I did check the flatness while I was messing around trying to get it to fit the first time (it should have bee ok as it was brand new but...). I'll order a good load of gaskets and start playing again. Most jobs on the Scim are a pleasure but I do not enjoy this particular one. :evil:
Last edited by Mr Bridger on Wed Aug 08, 2018 2:45 pm, edited 1 time in total.


1975 SE5a - Daily Driver
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Getting a seal on a tubular exhaust manifold

Post by Mr Bridger » Wed Aug 08, 2018 2:44 pm

Just a thought; on the gaskets there is a smooth side and a dimpled side. Does it matter which side faces the head and which the manifold?


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Getting a seal on a tubular exhaust manifold

Post by philhoward » Wed Aug 08, 2018 2:46 pm

I think that, despite their appearance, they actually only really fit one way round (offer one up and you'll see what I mean).


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