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Rick Fryer

Jul 14, 2015 - 12:33AM

Re: Crankcase/block gasket

Peter, it's unlikely that a commercial firm will use individual sheets of material bought on ebay - I think they will buy it by the roll. The question is as to thickness - 39gsm sounds pretty thin to me, bearing in mind that common A4 printer paper is 80gsm. But that may be thick enough, I really don't know, which is why I would like to find out what thickness the Oz guys use.

Rick

Location: Deepest Norfolk

Jul 14th, 2015 - 12:33 AM

Ian Williams

Jul 14, 2015 - 1:47AM

Re: Crankcase/block gasket

http://pub25.bravenet.com/forum/static/show.php?usernum=2099944454&frmid=5&msgid=972475&cmd=show

Previous thread here, note that the Aussie guys use a mat with an integral weave.

With the apparent difficulty and cost of getting them made commercially, I would suggest the best way if you wish to experiment is the use of baking sheets as in Doug Bakers article.

Enter Tony Press, stage west.....

Location: NZ

Jul 14th, 2015 - 1:47 AM

Tony Press

Jul 14, 2015 - 5:49AM

Re: Crankcase/block gasket

Ian,

Since this silicon gasket suggestion was mentioned last year I have not had any reports from anyone trying it.

I would be a little wary of a thickish gasket, preferring to rely on a good gasket cement and close fit between block and crankcase.

Tony.

Jul 14th, 2015 - 5:49 AM

Ruairidh Dunford

Jul 18, 2015 - 1:57PM

Re: Crankcase/block gasket

Hi Rick,

I will get in touch with you once I am home again.

Email Website

Jul 18th, 2015 - 1:57 PM

John Mason

Jul 18, 2015 - 5:18PM

Re: Crankcase/block gasket

John Mason

I have used Permatex aviation gasket sealant number 3 which can be bought on ebay. You can use it with or without the paper gasket ( I used a paper gasket as I think it helps with any slight unevenness of mating faces) this is an alcohol based sealant that is just brushed on with the brush provided. Leave for a few minutes and it gets very sticky. Bolt together and after about 10 mins and it is supposed to be oil tight however they recommend over night. It is then oil, water and petrol tight. It never dries hard so allows slight movement between surfaces without breaking. My seven has not leaked since I used it over 12 months ago.

John Mason

Since. Putting my two peneth on this blog I have now discovered that Permatex aviation number 3 is what the people who keep the RAF Battle of Britain flight in the air. If it's good enough for them on Rolls Royce Merlin engines it is good enough for my humble seven.

John Mason.

Location: Nottinghamshire

Jul 18th, 2015 - 5:18 PM

Simon Jansen

Jul 18, 2015 - 9:48PM

Re: Crankcase/block gasket

John Mason

Hey, that stuff is even available in New Zealand and isn't expensive!

http://www.supercheapauto.co.nz/online-store/products/Permatex-Aviation-Form-A-Gasket-Sealant-Liquid-No-3-59mL.aspx?pid=5355#Recommendations

Usually people mentions various things and you find it's impossible to get here and far too expensive to have sent from overseas. Two examples I had recently (not mentioned on here) were slotted oval head wood screws and waxed lacing cord.

I'll have to grab some next time I am at Supercheap (which are everywhere) as I want to start building my engine soon. I have a tube of 518 somewhere too I think.

Simon

Location: Auckland

Email Website

Jul 18th, 2015 - 9:48 PM

Adrian Payne

Oct 26, 2016 - 12:57PM

Re: Crankcase/block gasket

Hi All
My chummy has finally thrown his 1 1/8" crank, ironic that I had already bought a phoenix for the winter project.
The question is, where are we with the silicon gaskets. Has anyone got anything to add to this thread or are we back to no gasket with sealant?
Many thanks.
Adrian.

Location: New Forest

Oct 26th, 2016 - 12:57 PM

Jeff Taylor

Oct 26, 2016 - 1:06PM

Re: Crankcase/block gasket

Adrian,

The Seven Workshop now stock them.

https://www.theaustinsevenworkshop.com/products/e0122s-silicone-rubber-base-gasket

Jeff.

Location: Almost but not quite, the far North East of England

Oct 26th, 2016 - 1:06 PM

Ruairidh Dunford

Oct 26, 2016 - 1:06PM

Re: Crankcase/block gasket

They are available here Adrian: https://www.theaustinsevenworkshop.com/products/e0122s-silicone-rubber-base-gasket of the dozen or so I have now fitted, all provide a completely oil tight seal, I can highly recommend them.

Oct 26th, 2016 - 1:06 PM

Adrian Payne

Oct 26, 2016 - 1:55PM

Re: Crankcase/block gasket

Hi Ruairidh
Thats great news, just use as is or with sealant?
Adrian.

Location: The New Forest

Ruairidh Dunford

Oct 26, 2016 - 1:59PM

Re: Crankcase/block gasket

Clean everything and fit it dry - some will creep out of the joint slightly, you can either leave this protruding slightly or trim.

Oct 26th, 2016 - 1:59 PM

Adrian Payne

Oct 26, 2016 - 3:23PM

Re: Crankcase/block gasket

Hi Ruairidh
Many thanks for the information.
Adrian.

Location: The New Forest

Malcolm Parker

Oct 26, 2016 - 4:36PM

Re: Crankcase/block gasket

I have a silicone gasket on the Ulster engine and so far so good. It has spread slightly on tightening down the block. It was fitted dry but I have since learned that every trace of oil should be removed from the joint as it is this that causes the silicone gasket to creep. If I was doing the job again I would use brake cleaner or similar to clean the top of the case and the underside of the block before fitting the gasket.

Steve Jones

Oct 26, 2016 - 5:05PM

Re: Crankcase/block gasket

Malcolm Parker

.....If I was doing the job again I would use brake cleaner or similar to clean the top of the case and the underside of the block before fitting the gasket.

Didn't we do that? I thought we did.

Steve

Location: North Yorkshire

Oct 26th, 2016 - 5:05 PM

Ruairidh Dunford

Oct 26, 2016 - 5:06PM

Re: Crankcase/block gasket

Malcolm Parker

I would use brake cleaner or similar to clean the top of the case and the underside of the block before fitting the gasket.

This is exactly what I use liberally followed immediately by a blast from my airline - works a treat. Even with this you still get a little creep, in my experience.

Oct 26th, 2016 - 5:06 PM

ian Williams

Oct 26, 2016 - 6:46PM

Re: Crankcase/block gasket

I have also now had extremely good results with silicone sheet block gaskets, not the slightest sign of an oil leak. We even made one which cured a persistent block crankcase leak on Joss 12/4, all very promising and highly recommended!

Location: Auckland NZ

Oct 26th, 2016 - 6:46 PM

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