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FW: Valve seal R/R U20

To: <datsun-roadsters@autox.team.net>
Subject: FW: Valve seal R/R U20
From: "Graeme" <graemes@internode.on.net>
Date: Tue, 5 Dec 2006 14:48:02 +1030
"You can get a fitting or make one that will screw in to the spark plug and
hook up to an air hose, the air pressue will hold the valves shut, much
easyer than useing rope

Mike"

Hi list,
An "inflatable spark plug" is a really handy tool.
The limiting factor I have found is the sealing quality of the piston rings
and valve seats.
On a reasonably fresh engine, no problem.
A squirt of oil in the spark plug hole first should also assist the rings to
seal. 
I tried this method on a well worn Mini engine and it farted out more air
than my compressor could supply! 
It turned out easier to take the head off and do the job conventionally.


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