I have run engines with knurled valve guides; they work fine. If you don't
want excessive oil down the guides, I suggest that you go a bit more modern and
have the machine shop fit Teflon "umbrella" type seals to the engine. I
normally leave the seals off the exhausts.
Best,
Ray
"Protecting man from folly only
assures a world full of fools."
----- Original Message -----
From: Gerhard Maier
To: TATERRY@aol.com ; mg-mmm@autox.team.net
Sent: Sunday, January 26, 2003 7:52 AM
Subject: oil in valve guide(Sleep aid! your Head)
I also followed Geoff Coles advise years ago,
to soak the top of the valve spring-caps with a thinned
silicon compound, but I am not so sure that it helps.
I wonder, when the engine is running,
if the high frequency oscillation of the spring cap,
allows the oil anyway to follow the gravity.
Surely when the engine stops, the sealing compound
can do its job at this place.
But when the engine is running, it is the oil-spray from
the valve spring, which adheres to the valve stem,
and then goes down the guide.
Andrew Fock's idea that on blown engines the
oil can't go down between stem and guide is theoretical.
Remember that also a blown engine is most of the time sucking,
when your right foot is not heavy leaded.
If the guides are worn out, usually replacement is the solution, but
has somebody practical knowledge of the k n u r l i n g method ?
With this treatment the worn out valve guide is cold-rolled
in situation, and so the inside-diameter reduced by
forming a spiral groove.
After reaming to the desired clearance the grooves
serve as pockets for lubrication.
That sounds interesting, but surely it needs expensive
special tools for our 9/32 inch stem-size.
Gerhard Maier
+++++++++++++++++++++++++++++++++++++++++++++++++++
>>-----Original Message-----
>>From: owner-mg-mmm@autox.team.net [mailto:owner-mg-mmm@autox.team.net]On
>>Behalf Of TATERRY@aol.com
>>Sent: Friday, January 24, 2003 8:00 PM
>>To: mg-mmm@autox.team.net
>>Subject: Sleep aid! your Head
>>
>>
>>Gentle Folk of the MMM list....lately I have been rereading copies of old
>>yearbooks. I can highly recommend this for putting you to sleep!
>>Last night I read the first issue of the Yearbook, 1970. In it is an
article
>>by Geoff Coles giving chapter and verse on rebuilding your engines
>>head....here is the puzzler and what kept me dreaming all night!
>>
>>in Step 17, right after he tells you to reassemble the valves and springs,
he
>>sez: Put some sealing compound - Wellseal is the best - on top of the valve
>>so that it soaks down the cotters or circlip. This ensures that too much
oil
>>does not go down the guide, as quite a lot usually collect on top of the
>>spring cap, when the engine is running.
>>
>>This seems a strange way to seal the valve guides to me, but I'm just a
>>newcomer.......
>>
>>What's the general view of this advice these days??
>>
>>Cheers
>>Terry
>>
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