Author Topic: C15 Head Gasket Advice  (Read 4419 times)

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gusmagicbus

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C15 Head Gasket Advice
« on: 05 February, 2017, 20:32:36 »
Hello,

I'm rebuilding a C15 SS80 1964. I've measured the thickness of my cylinder head gasket (~.039 - .040") and bolted the head onto the barrell without the gasket and measure the thickness of the gap which is about ~.035 - 0.38 depending on which corner you stick the feeler guages in. Hence, compression on the gasket could be as low as .001" in one section.  I think the head has probably had one too many skims, and I am worried that the gasket will blow (or leak oil).

I guess a slightly thicker gasket would be good, does anyone know where I can get one off these or if there is another trick commonly used. Or even if 001" gasket compression is ok.

Thanks
Steve

TTJOHN

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Re: C15 Head Gasket Advice
« Reply #1 on: 06 February, 2017, 13:15:03 »
Steve,
 I have a spare solid copper gasket that came off of a C15, your quite welcome to it for the price of the p+p, the other trick with these is to put a thicker gasket under the barrel, or double up.

TTJohn

gusmagicbus

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Re: C15 Head Gasket Advice
« Reply #2 on: 09 February, 2017, 00:16:24 »
Hi TTJohn

Sounds like an excellent offer, thank you. How do we arrange that then!?

TTJOHN

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Re: C15 Head Gasket Advice
« Reply #3 on: 10 February, 2017, 09:33:49 »
Steve, you can e-mail me with your address to Jomichael@aol.com

Regards TTJohn

AWJDThumper

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Re: C15 Head Gasket Advice
« Reply #4 on: 11 February, 2017, 11:24:20 »
Steve.

It does sound as though you head has been skimmed too far - I think 1 thou of gasket compression is going to be too low and I'm sure would cause problems. I think 5 thou would be the minimum required. My old C15 gasket is about 38 thou and a new one might be a little thicker but still not thick enough.

The simplest solution might be to get 4 thou skimmed off the top of cylinder liner - this will increase the compression ratio by a small amount but shouldn't be too significant. The alternate solution would be to get a bespoke copper head gasket made of the correct thickness, if possible - there are a lot of companies that advertise this service.

AWJDThumper

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Re: C15 Head Gasket Advice
« Reply #5 on: 11 February, 2017, 11:43:45 »
Just found this 47 thou thick C15 gasket advertised, albeit in the US. If the standard one is normally 40 thou thick, one like this might solve your problem.

http://www.bsaunitsingles.com/item.wws?cpubcode=BSAU&sku=40-0140