Topica Loopframe_Guzzi Archive


Subject: RE: leak down test

Author: halc-@comcast.net

Date: Aug 3, 2005, 6:04 AM

Post ID: 1719245810



They are easy to make

I just made a real nice one for under $20. BUT you need a compressor to use this. It is a good tool to have around if you like older machines.

T
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madr-@earthlink.net wrote:
 I am pretty mec hanical but I have to confess I haved never heard
of a leak down test.

Air is pumped into a cylinder thru the spark plug hole using a fitting.
An air pressure guage is attached to it and I do not remember how many
psi is pumped in....100? Set the piston at TDC.
When pressurized you listen for air escaping. You might hear it blowing
in the exhaust (bad exhaust valve sealing) blowing thru the carb ( bad
intake valve seal) or echoing in the crankcase (rings).
The gauge will tell you how much pressure is escaping. I had 30% leakage
on one side and it whistled like a locomotive horn as the air blew out
the exhaust value.

Later,
JU

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