These O-Rings were/are the usual stem seals on the 948/1098 engines with
the original guides. They aren't as effective as the wonderful new viton
ones that fit over a groove on the newer guides, but they do work pretty
well. They keep the oil from running down the stem and past the guides.
They are placed between the valve spring cap and the bottom of the
keepers. They should be used even if you have the new style stem seals.
Paul
PAsgeirsson@juno.com
On Wed, 15 Mar 2000 09:35:18 -0800 (PST) Bryan Vandiver
<Bryan.Vandiver@Eng.Sun.COM> writes:
>Fred,
>
>I may be mistaken, but I don't think the O-rings are intended to be
>use as
>seals. I think a lot of kits include them to be used to be put over
>the valve
>stems to 'temporarily' hold the valves on the head, so that you can
>get the
>springs and retainers on.
>
> - Bryan
>
>>To: "mgs-digest list" <mgs@autox.team.net>,
>"spridgets-digest@autox.team.net"
><spridgets@autox.team.net>
>>Subject: Valve Seal O-Rings
>>MIME-Version: 1.0 charset="iso-8859-1"
>>X-Priority: 3
>>X-MSMail-Priority: Normal
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>>
>>I've just rebuilt a cylinder head on my Mini. It's a 998 and had no
>obvious
>>seals installed previously. I realize they are not required on the
>exhaust
>>valves, but the gasket kits include 8 o-ring seals. I installed them
>under
>>the retainers and they position themselves about half-way between the
>top of
>>the guide and the retainer.
>>
>>I can't see how this will prevent much oil entering the guides
>although it
>>might help somewhat. Have I installed them in the correct location?
>>
>>
>>Fred Pixley
>>Napanee, Ontario, Canada
>>fpixley@kingston.net
>>
>>
>
http://dl.www.juno.com/get/tagj.
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