Neil, I think even it has the valve it will leak.
Mine leaks. So by the time you jump off from the driver
seat to get to the rear the gauge will show a lower
reading. It takes a few seconds for mine to leak 10 or even
20 PSI. So what you see is probably normal. If you read
100 PSI it probably had 120 or higher.

David

--- neil N <musomuso@GMAIL.COM> wrote:

> thanks. good to know.
>
> yah it's the kind with the release valve.
>
> Maybe the connectison to adaptor or to gauge are hinky
>
> On 11/16/07, Don Spence <dkspence@telus.net> wrote:
> > The gauge will hold peak pressure if it is the type designed to do
> > so. If such, it will have a release button to zero the gauge.  It not
> > it will register the pressure it sees. You have to watch it and read
> > peak pressures. In the case as described (dropping pressure) that
> > would indicate either leaking valves or worn rings.  Do a dry/wet
> > pair of tests on each cylinder. (test dry then squirt some oil into
> > the cylinder and test again.) If a noticeable improvement you have
> > worn rings, if not, leaking valves.Date:    Fri,
> >
> >
> >
> > 16 Nov 2007 08:26:12 -0800
> > From:    neil N <musomuso@GMAIL.COM>
> > Subject: Compression tester question
> >
> > Hi all.
> >
> > I bought a compression tester and tried it on my parts van 1.9 WBX
> > engine. On two of the cylinders, the gauge would drop while still
> > threaded in sparkplug hole.
> >
> > I was doing this w/o remote starter.
> >
> > The gauge should hold its' reading right? i.e. once it's pumped up, it
> > should stay there correct?
> >
> > It was threaded properly, and adaptor to hose was threaded properly too.
> >
> > Apologies for such and elementary question!
> >
> > Neil.
> >
> >
> >
> >
>
>
> --
> Neil Nicholson. 1981 Air Cooled Westfalia -
> "Jaco"  (Bustorius)
>
> http://web.mac.com/tubaneil
>

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