valve cover o ring size

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Phantom Phyxer New Member 1978 Standard, 1979 Special Posts: 24	valve cover o ring size Mar 18, 2016 21:52:06 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Phantom Phyxer on Mar 18, 2016 21:52:06 GMT -5 Hi, I would like to order valve cover o rings from McMaster Carr. Any idea what size they are?

5twins
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Senior Technical Adviser

1978 E Standard and 4 Euro Twins

Posts: 4,144

valve cover o ring size Jun 21, 2016 9:44:33 GMT -5

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Post by 5twins on Jun 21, 2016 9:44:33 GMT -5

According to the parts listings, the size is 2.8mm thick x 62mm I.D. 2.8mm thick o-rings are a bit difficult to find but in this case, a 3mm thick one fits and works just fine .....

www.mcmaster.com/#9262k408/=12y7vul

You can also get silicone ones from Amazon .....

www.amazon.com/dp/B008MKWE04/ref=wl_it_dp_o_pC_S_ttl?_encoding=UTF8&colid=3HN10FLROYVSA&coliid=I6E4ZL4FUFVV1

You might also be interested in getting some for the cam chain adjuster acorn cap nut. Again, the stock size listed is rather odd, 2.6mm thick x 20.6mm I.D. In this case, there happens to be an American size that fits perfectly. It is 3/32" thick x 13/16" I.D. .....

www.mcmaster.com/#9452k81/=12y85eu

Phantom Phyxer
New Member

1978 Standard, 1979 Special

Posts: 24

valve cover o ring size Jun 21, 2016 17:27:11 GMT -5

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Post by Phantom Phyxer on Jun 21, 2016 17:27:11 GMT -5

Thanks, that's great info. I figured out what the dimensions were by looking at the part # description; O-Ring (2.8-62) and then looking at the McMaster Carr catalogue. I never knew that before. As you say, the 3mm works great.

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valve cover o ring size

Post by Phantom Phyxer on Mar 18, 2016 21:52:06 GMT -5

Post by 5twins on Jun 21, 2016 9:44:33 GMT -5

Post by Phantom Phyxer on Jun 21, 2016 17:27:11 GMT -5

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