Mailing List lml@lancaironline.net Message #43405
From: Brent Regan <brent@regandesigns.com>
Sender: <marv@lancaironline.net>
Subject: RE: TSIO-550-E Compression
Date: Tue, 07 Aug 2007 05:56:49 -0400
To: <lml@lancaironline.net>
Skip asks:

During this years conditional inspection cylinder #5's compression
was found to be 40/80. All the other cylinders are in the mid 70's.
You can hear air escaping past what I believe to be the 
exhaust port. Engine has less then 100 hour since new.
Any words of wisdom before I remove the cylinder.
 
Thanks
Skip
>>>

Skip, you want to check that the leak is not caused by a chunk of carbon falling from the spark plug thread area as the plug was removed for installing the leak tester fitting. Remove the valve cover and tap the end of the valve stem (via the rocker) with a dead blow hammer or a soft metal drift to see if you can get the valve to seat.

Alternately, you can start the engine and run it for a few minutes before rechecking the compression on that cylinder.  Running the engine will blow out any carbon crumbs.

Regards
Brent  Regan
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