Is milling the only answer?

[dwhitaker]

Hi All, see this pic for a fine example of TVR's best. This is one of the exhaust manifold ports, looks like the original casting was low in the bottom half of the picture on this port, so TVR added some weld and milled it back. Only they did not weld over the whole low part and the gasket was blowing. FYI the head side is good.


Suggestions on the best gasket sealant to use in this location appreciated as an alternative to getting the faces milled.

Opinions on this plug also appreciated. Is this running too rich? Or about right. Standard 4.0 was doing 187 at the wheels corrected. So not too bad I guess.

[jamienshelly]

If you have been on a rolling road, they should have readings if its running rich or weak under load and at how many revs!.
You can start the car from cold and idle for a couple of minutes and the plugs may be sooty.
Depending on how proud the high spots are on your manifold, you may get away with filing it flat and just us new gaskets.
There are many reviews and thoughts on the different types whether to use tin are composite types, the choice is yours, but if you are trying to fill a small void, then the composite ones may work better for you.
Hope this helps

[dwhitaker]

It just had paper ones before. The ones I have are a bit more robust, and composite, but would be happier with some sort of paste too.

[jamienshelly]

I shouldn't need to use a jointing compound on the head as the surface should be flat, and any variation should be catered for in the gasket.

[pwd95]

I always used to double up with large bore gaskets.

[dwhitaker]

That's the problem, the head is flat, but the manifold is not. See picture.

[fausTVR]

I'd suggest using a flat nylon block wrapped in 400 wet and dry to flatten it, add some oil so the paper doesn't clagg up.

[phillpot]

The Manifolds on the V6 S Series cars suffer similarly from corrosion/erosion.

Not myself but others have inquired about milling but seems most machine shops are not interested because the manifold is too flexible and awkward to support?

With mine I got away with some draw filing on the least damaged and others I built up with braze then set about with a file.


Once you have them "pretty good" no paste or sealant should be necessary, imho.

[WinstonWolf]

I'd clean that up with a second cut file, but I'm bloody good with a file

[s p a c e m a n]

The job that dremel grinding drill bit thingys were made for

[jojackson4]

im doing mine its next on the list after doing the cosy caliper up grade
there coming off and both will be meeting with the miller after reading the nightmares im doing it once

[hififreak]

Hi!
i had a strange Sound that seemed to be the tappets, i decided to restore the whole engine;
nevertheless the Sound came from a blowing exhaust manifold gasket
after grinding i used a set of new gaskets and made a testdrive (few hours)
after that with lets say quite hot engine i took of the manifolds again and i saw, that it was not really gastight
(blueing)

so grinding again and then milling the bridges of the flange
the longer two pipes are still together but bridges milled
and the Connection between shorter and longer pipes is completely cut out!

now the manifold is gastight!
the length difference is the Problem of the distortion

[jojackson4]

Has any one cut the bridges out completely ?