Certainly a defective gauge, should be a little pin, button or such on the
side of the unit that releases the pressure reading.
I think what may be happening is that your engine happens to stop with one
of the #4 valves open -- some valve has to be open when the engine stops --
and thus no compression remains.
I would check again and perform the other tests before pulling the head.
Geo
----- Original Message -----
From: "Randall" <tr3driver@ca.rr.com>
To: "'Triumph List'" <triumphs@Autox.Team.Net>
Sent: Sunday, December 16, 2007 8:43 PM
Subject: Re: [TR] engine compression results
>> as soon as I stopped
>> turning the engine over the gauge just sank to zero.
>
> John, I find this statement very puzzling. It sounds like your
> compression
> gauge is defective ... it should always hold the peak reading as the
> cylinder normally has no pressure (while cranking) for most of the cycle.
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