Exhaust manifold seal rings

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lowact
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#1 Exhaust manifold seal rings

Post by lowact » Sun Dec 20, 2020 9:59 am

My nomination for the hardest task: renewing the exhaust manifold seal rings (C.18405/1 > EBC9388). Old one's fused into place. Exhaust so it is impervious to heat. Hacksaw, chisels and files. All that white stuff I guess is asbestos? One down 3 to go ...
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Regards,
ColinL
'72 OTS manual V12

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MarekH
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#2 Re: Exhaust manifold seal rings

Post by MarekH » Sun Dec 20, 2020 12:28 pm

It's probably just that white paste/gum that is used on exhaust manifold gaskets. You could have added some more and just sealed it up again.

There is in fact no need to ever separate the manifolds from the downpipe anyway. You can leave all three pieces connected until the fateful day when one of the manifolds cracks and needs replacing.

That'll be way higher up the list of jobs you don't ever want to do again....

kind regards
Marek

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#3 Re: Exhaust manifold seal rings

Post by lowact » Mon Dec 21, 2020 11:20 am

Yep, a definitive “not broke don’t fix”. But I’ve started, so will persevere. There is a lot of white stuff, internal as well as external …
Image
The reason for pulling it all apart, pretty it up and insulate with a few coats of ceramic paint, VHF Flameproof, they do a very realistic cast iron ….
Would be good not to need heat shields, although I am rather skeptical about paint’s ability to insulate, whatever its constituents and despite all the claims.
Regards,
ColinL
'72 OTS manual V12

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jagwit
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#4 Re: Exhaust manifold seal rings

Post by jagwit » Wed Dec 23, 2020 7:50 am

And then you should do the same on the exhaust manifold side....

I used a small hammer and chisel to remove all the non-cast iron material from the female ports
Best Regards
Philip
Jag: 72 S3 XKE, 73 S3 XKE OTS, 80 XJS (Megasquirt + 5sp manual O/D)
Jensen: 74 Interceptor (EFI by Megasquirt + O/D 4sp auto)
Chev: 59 Apache std, 70 C10 (350V8, 700R4)

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Adamski
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#5 Re: Exhaust manifold seal rings

Post by Adamski » Wed Dec 23, 2020 2:21 pm

Couldn't you just slice a chunk out with a junior hacksaw and peel off?
Adam
S3 V12 E Type FHC Manual 1972-owned since 1978
1957 XK150 since 1976

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Nialls Shortbear
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#6 Re: Exhaust manifold seal rings

Post by Nialls Shortbear » Wed Dec 23, 2020 11:53 pm

I'm amazed you managed to separate the down pipe from manifold. This is what we had to do to get the down pipes off, I just took it off the shop coffee table where it sits as a monument to the task of brute force it took to get it out. It still has your mate the sealing ring on after all that beating up too.

We often wondered if this is why you see the cars for sale that boast a stainless exhaust usually have the original down pipes, or maybe we are a bit naff at this perhaps.....

NS
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#7 Re: Exhaust manifold seal rings

Post by lowact » Thu Dec 24, 2020 10:31 am

Ouch, all my complaining, seems I had it easy. Came apart easy(ish) I think because the seal rings split open, leaving the tops fused into the manifolds and the bottoms fused into the downpipes. Hacksawing off a slice and peeling was basically what we did, although hacksaw teeth melted away almost immediately and the peeling was with (large) hammer and chisel, with angle grinder to sharpen and quench harden the chisel every couple of minutes. All behind me now …
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Regards,
ColinL
'72 OTS manual V12

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AussieEtype
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#8 Re: Exhaust manifold seal rings

Post by AussieEtype » Thu Dec 24, 2020 10:36 am

Now watch the studs snap when you put is all together :cry: - I assume new studs and nuts.
1971 Series 3 E-type OTS

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#9 Re: Exhaust manifold seal rings

Post by Nialls Shortbear » Thu Dec 24, 2020 10:12 pm

Yeah, use those stainless studs with anti-seize. And speaking of those studs, our 71 coupe has 3/8" UNF fine, whereas the 72 OTS has a right weird coarse thread. That seemed strange.

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Adamski
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#10 Re: Exhaust manifold seal rings

Post by Adamski » Sat Dec 26, 2020 2:26 pm

I seem to remember the nuts have a piece of wire in them that is sacrificial when you try to undo them.
Adam
S3 V12 E Type FHC Manual 1972-owned since 1978
1957 XK150 since 1976

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#11 Re: Exhaust manifold seal rings

Post by lowact » Mon Dec 28, 2020 11:43 am

Ok, thx, stainless downpipe studs now are ordered.
Regards,
ColinL
'72 OTS manual V12

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#12 Re: Exhaust manifold seal rings

Post by lowact » Fri Feb 05, 2021 11:59 am

There's been a lot said on this subject:
http://forum.etypeuk.com/viewtopic.php? ... t=manifold
http://forum.etypeuk.com/viewtopic.php? ... t+manifold

Now SNGB list the manifolds (C39109/10) as "no longer available".

After bolting mine on i can push a feeler gauge into one of the ports, i.e.:
Image
I guess this means it will leak. Has anyone had lasting success with double gaskets and/or plenty of putty?
Regards,
ColinL
'72 OTS manual V12

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jagwit
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#13 Re: Exhaust manifold seal rings

Post by jagwit » Fri Feb 05, 2021 3:55 pm

I would rather skim those manifolds, taking into consideration that the two ports must still align after being mounted to the head.
Best Regards
Philip
Jag: 72 S3 XKE, 73 S3 XKE OTS, 80 XJS (Megasquirt + 5sp manual O/D)
Jensen: 74 Interceptor (EFI by Megasquirt + O/D 4sp auto)
Chev: 59 Apache std, 70 C10 (350V8, 700R4)

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