Leak down,
The guage takes an air hose from a compressor, the other side goes into a
cylinder via a plug
hole.
Pressurize it, and leave the other plugs in.
You will hear air escaping, some will come from the rings some from the
valves, some out of the tail pipe. One thing you need to make real sure of
is that you block the car. If you go toooo far with the air the engine will
turn over !
But if you listen to the sound of the leaks you can tell WHERE most of it is
coming from.
All valves need to be CLOSED. Leaks from the valve stem area are bad stems
or seats, leaks inside the block are bad rings.
A vacuum guage is a whole different area.
The engine needs to be running, attach the vacuum at a good spot on the
intake and read the guage. There are volumes written about how to read one
at different RPMS.
I know of a book that I have on rebuilding a Chevy Performance 350 that is
FOUR pages long.
Also, when doing a static compression check the engine needs to be hot.
-----Original Message-----
From: rtgetzinger@scif.com [mailto:rtgetzinger@scif.com]
Sent: Friday, June 15, 2001 10:54 AM
To: 'D T Gebhard'; Craig Smith; Spitfire List; CraigS@iewc.com
Subject: RE: Cylinder Compression
Can you briefly describe the proceedure of using the leak down and vaccum
guage to determine the source of the leak?
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