Big bore exhaust gaskets - V8 3.9?
Big bore exhaust gaskets - V8 3.9?
Author
Discussion

adam quantrill

Original Poster:

11,671 posts

269 months

Saturday 23rd August 2014
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Any good sources for these - I only need one but I'll get a whole set, even so I'd rather not pay a tenner postage. Look like some on the flea but it's hard to tell the port size from the piccies.

MrPicky

1,233 posts

294 months

Sunday 24th August 2014
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I made my own from sheet copper over 20 years ago, still going well.

Russ

Wedg1e

27,026 posts

292 months

Sunday 24th August 2014
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I think I used composites from LandRover in my 2001 rebuild... still in there biggrin

Unless you mean a TVR 3.9 with 93.5mm bores, in which case you'll need something a bit more specialised.

Sardonicus

19,398 posts

248 months

adam quantrill

Original Poster:

11,671 posts

269 months

Thursday 16th October 2014
quotequote all
Well at £20 a set that ain't gonna happen frankly!

The No.8 one failed this morning and was so loud I had to pull the injector connector on the way home!

MrPicky said:
I made my own from sheet copper over 20 years ago, still going well.

Russ
So - half an hour with some tin snips on a sheet of copper and hey-presto! One new gasket. Another half-hour and it was in there.

When you are replacing one gasket, you can get it in by loosening off but not undoing the bolts on the port next door, then levering the mainfold away from the heads a fraction with a jack handle.

In my case the bolts were a little tight to get back in there so I had to jack up the pipe a bit next to the olive - you need to be able to put the bolts back in with your fingers, or else you could damage the weak threads in the heads.

Anyway - gasket in - and silence is golden! At least under the bonnet!!

Good call, Russ - just another seven to make, but only as and when needed....


Sardonicus

19,398 posts

248 months

Friday 17th October 2014
quotequote all
adam quantrill said:
So - half an hour with some tin snips on a sheet of copper and hey-presto! One new gasket. Another half-hour and it was in there.

When you are replacing one gasket, you can get it in by loosening off but not undoing the bolts on the port next door, then levering the mainfold away from the heads a fraction with a jack handle.

In my case the bolts were a little tight to get back in there so I had to jack up the pipe a bit next to the olive - you need to be able to put the bolts back in with your fingers, or else you could damage the weak threads in the heads.

Anyway - gasket in - and silence is golden! At least under the bonnet!!

Good call, Russ - just another seven to make, but only as and when needed....
Anytime rolleyes do you peel oranges in your pockets by chance scratchchin

phazed

22,457 posts

231 months

Friday 17th October 2014
quotequote all
Sardonicus said:
adam quantrill said:
So - half an hour with some tin snips on a sheet of copper and hey-presto! One new gasket. Another half-hour and it was in there.

When you are replacing one gasket, you can get it in by loosening off but not undoing the bolts on the port next door, then levering the mainfold away from the heads a fraction with a jack handle.

In my case the bolts were a little tight to get back in there so I had to jack up the pipe a bit next to the olive - you need to be able to put the bolts back in with your fingers, or else you could damage the weak threads in the heads.

Anyway - gasket in - and silence is golden! At least under the bonnet!!

Good call, Russ - just another seven to make, but only as and when needed....
Anytime rolleyes do you peel oranges in your pockets by chance scratchchin
rofl


rev-erend

21,619 posts

311 months

Friday 17th October 2014
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Adam - I have some new ones that I never used. Will see if I can find one of them over the weekend for you as I dont used gaskets anymore.

adam quantrill

Original Poster:

11,671 posts

269 months

Friday 17th October 2014
quotequote all
Sardonicus said:
nytime rolleyes do you peel oranges in your pockets by chance scratchchin
There is no room for that - I have the pocket billiards world championships going on right now ;^)

It's not just being tight BTW (and there's a difference between being a bit tight and not wanting to be blatently ripped off) - the copper ones will last for 20 years (see above) and I needed one last night. Can't see ACT driving to my gaff at half past whatsit, can you?

Edited by adam quantrill on Friday 17th October 14:37

phazed

22,457 posts

231 months

Friday 17th October 2014
quotequote all
Depends where you live.

I picked up a plenum gasket from Tim, (ACT) on a Saturday afternoon three weeks ago when he was having a barbecue at home wink

Sardonicus

19,398 posts

248 months

Friday 17th October 2014
quotequote all
phazed said:
Depends where you live.

I picked up a plenum gasket from Tim, (ACT) on a Saturday afternoon three weeks ago when he was having a barbecue at home wink
biggrin

adam quantrill

Original Poster:

11,671 posts

269 months

Sunday 4th January 2015
quotequote all
In case anyone else wants to "roll their own" I just scanned the one the Rev sent me, just print it out and use as a template (check your printout matches the ruler for scale...)

My original copper one just came off as I have the exhaust off and is completely unharmed, unlike the traditional ones two of which are toast - so it definitely pays to get the snips out and peel away!


rev-erend

21,619 posts

311 months

Monday 5th January 2015
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Or if your heads and manifolds faces are in good condition you can use hi temp silicon. I only have silicon on mine and it seals OK.. with no exhaust gas leaks.