O-rings for KR Valve Covers

Racing K Models

O-rings for KR Valve Covers

Postby wz507 » Tue Jul 20, 2021 10:46 pm

Might anybody know the dimensions of the upper (18271-55R) and lower (18272-55R) o-rings used in KR valve covers? Thank you.
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Re: O-rings for KR Valve Covers

Postby hennesse » Tue Jul 20, 2021 11:38 pm

Are you talking about the standard valve spring covers, or the special KR double valve spring covers?

I have the double, and I hope I can find the standard o-ring number (from McMaster-Carr) that I used in mine.

Lemme know.
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Re: O-rings for KR Valve Covers

Postby wz507 » Wed Jul 21, 2021 7:12 am

hennesse wrote:Are you talking about the standard valve spring covers, or the special KR double valve spring covers?

Lemme know.
Dave


The KR double valve spring covers.
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Re: O-rings for KR Valve Covers

Postby panic » Mon Jul 26, 2021 7:20 pm

K-D makes a kit to make your own from lengths.
[url="http://victorylibrary.com/L-BK.htm"]The Linkert Book[/url]
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Re: O-rings for KR Valve Covers

Postby hennesse » Tue Aug 17, 2021 10:57 am

wz507 wrote:Might anybody know the dimensions of the upper (18271-55R) and lower (18272-55R) o-rings used in KR valve covers? Thank you.


It's taken a long time, but I finally found a bag that says:

O-Rings
1-7/16 x 3/32 x 1-1/4
1-1/4 x 3/32 x 1-1/16

I'm not 100% sure, but I think these are them.

Inside the bag are a bunch of the 1-1/4 x 3/32 x 1-1/16 ones. I'll be glad to mail you a handful. I'll keep looking for the other ones.
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Re: O-rings for KR Valve Covers

Postby Tim The Grim » Tue Aug 17, 2021 11:08 am

McMaster Carr has these…

Oil-Resistant Buna-N O-Ring, 3/32 Fractional Width, Dash Number 124

https://www.mcmaster.com/9452K88
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Re: O-rings for KR Valve Covers

Postby wz507 » Tue Aug 17, 2021 12:12 pm

Tim, can you by chance verify the sizes that Dave has suggested? I ask because Dave is not feeling 100% confident on the quoted sizes.
Last edited by wz507 on Tue Aug 17, 2021 3:45 pm, edited 1 time in total.
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Re: O-rings for KR Valve Covers

Postby Tim The Grim » Tue Aug 17, 2021 2:45 pm

No sorry. I don’t have any of that stuff.

Back in ‘73, when I worked for a dealership, the factory sent out a close out sheet with all the KR parts on it. I ordered 2 different sets of cams, a set of heads and all the roto-cap valve gear and covers. When our next parts lot was delivered and NONE of my stuff was there, we called Milwaukee and were told that “The Motor Shop” in Oxnard, CA had bought the whole obsolete parts lot and we would get squat. Not happy.
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