Hi George,

Thanks for the info.  As I said, I'm familiar with the procedure.  You've
hit the nail on the head with your response though - if a regulated pressure
is applied to a cylinder, isn't the pressure in the cylinder going to be the
same as the regulated pressure?  That's the whole point of a pressure
regulator - keeping a pressure constant regardless of flow (leaks, in this case).

Thanks for clarification!

--tabe

> Date:    Wed, 26 Jan 2005 08:13:59 EST
> From:    George Goff <THX0001@AOL.COM>
> Subject: Re: How does a leak down tester work???
>
> In a message dated 1/26/05 12:49:17 AM, xtabe@YAHOO.COM writes:
>
> << What am I missing here? >>
>
> Everything.  A leak down tester applies a regulated pressure to the cylinder
> under test and the resulting pressure in the cylinder is read as a percentage
> of the regulated pressure.  To keep things simple, the regulated pressure is
> usually 100 PSI making the percentage leakage merely the difference between the
> two pressures.  For a leak down test to be valid, the valves must be kept
> fully closed.  As matter of safety, the piston in the subject cylinder must be at
> bottom dead center so that the application of the air does not rotate the
> crank.
>
> George
>

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