|
Author |
Message |
WOODY2
Joined: 21 Mar 2011 Posts: 22 Location: Charente,France
|
Posted: Wed Jun 17, 2015 8:47 pm Post subject: wrong head gasket? |
|
|
Hi, I'm in France and still restoring my 1951 Simca 8.In the end decided to do a full rebuild on the engine (with help) Over here head gaskets are not too hard to find (unused old stock)so I bought one on the net for 40€.This was 2 full pieces of copper with an asbestos piece in the middle.It was a bit too rough looking though so the guy sent me another one which looked like new but was of a composite material with copper only around the cylinder holes on both sides.I used this one but when I put the coolant in it leaked like a sive!
Could this kind of gasket ever make a seal?The copper overall is 1mm and the composite 0.5mm.The head and block have been skimmed and torqed to the recommended amount.The head is aluminium.I did'nt use any sealant as the composite was coated in a sort of graphite?
I was well cheesed off and I thought about useing the all copper one I first got, but when I cleaned it up it became obvious that it had been used before.
I checked the site of a company that makes brand new ones (90€) but they look the same as the composite one.
Any advice would be welcome as this has become a real 'prise de tete' (it's doing my head in!) |
|
Back to top |
|
|
peter scott
Joined: 18 Dec 2007 Posts: 7113 Location: Edinburgh
|
|
Back to top |
|
|
WOODY2
Joined: 21 Mar 2011 Posts: 22 Location: Charente,France
|
Posted: Thu Jun 18, 2015 8:22 am Post subject: |
|
|
thanks Peter but the gasket is much more simple than that (I will try and post a pic)The copper is only around the cylinder holes, the rest is composite.Should the copper crush down enough to make a seal? |
|
Back to top |
|
|
WOODY2
Joined: 21 Mar 2011 Posts: 22 Location: Charente,France
|
Posted: Thu Jun 18, 2015 8:57 am Post subject: |
|
|
|
|
Back to top |
|
|
WOODY2
Joined: 21 Mar 2011 Posts: 22 Location: Charente,France
|
Posted: Thu Jun 18, 2015 9:00 am Post subject: |
|
|
This is the all copper gasket that has already been used.Marks from the head visible around the water holes. |
|
Back to top |
|
|
WOODY2
Joined: 21 Mar 2011 Posts: 22 Location: Charente,France
|
Posted: Thu Jun 18, 2015 9:02 am Post subject: |
|
|
this is the other one that leaks.
|
|
Back to top |
|
|
peter scott
Joined: 18 Dec 2007 Posts: 7113 Location: Edinburgh
|
Posted: Thu Jun 18, 2015 1:02 pm Post subject: |
|
|
Yes, I see what you mean. I think you would ideally want the copper to be formed around the water passages as well as the cylinders. That said, if your cooling system is not pressurised then a good gasket compound such as Hylomar around the apertures should prevent leakage.
Peter _________________ http://www.nostalgiatech.co.uk
1939 SS Jaguar 2 1/2 litre saloon |
|
Back to top |
|
|
WOODY2
Joined: 21 Mar 2011 Posts: 22 Location: Charente,France
|
Posted: Thu Jun 18, 2015 5:49 pm Post subject: |
|
|
what I dont understand is how this can make a seal if the copper is thicker than the composite.Surely the gasket should be a uniform thickness? |
|
Back to top |
|
|
peter scott
Joined: 18 Dec 2007 Posts: 7113 Location: Edinburgh
|
Posted: Thu Jun 18, 2015 8:35 pm Post subject: |
|
|
I guess it's puting the maximum compression around the bores as this is where stresses are greatest. Gasket sealant can deal with the low pressure (coolant) channels.
Peter _________________ http://www.nostalgiatech.co.uk
1939 SS Jaguar 2 1/2 litre saloon |
|
Back to top |
|
|
V8 Nutter
Joined: 27 Aug 2012 Posts: 587
|
Posted: Thu Jun 18, 2015 9:36 pm Post subject: |
|
|
I don't know if your car has studs or bolts, but if it's bolts are they bottoming out before they actually crush the gasket? |
|
Back to top |
|
|
|