REFLECTOR: Annual inspection

[Dave Philipsen]

Terry,

I believe that an auto compression checker works on a different 
principle than the ones that we normally use for aircraft engines.  The 
auto checkers I have seen usually plug into the spark plug hole and 
measure the compression created by the compression stroke of the 
piston.  The aircraft checker also plugs into the spark plug hole but 
compression is provided by an air compressor.  There is a small orifice 
which allows a little bit of air to escape but essentially you are using 
a static pressure test to see how fast the cylinder will leak down when 
the piston is at top dead center with both valves closed.  80 psi is the 
nominal pressure used so all reading taken will be at 80 psi or lower 
depending upon how well the piston rings and valves are sealing.

Dave Philipsen
Velocity STD-FG
N83DP

Terry Miles wrote:
>
> Dear All,
>
>  
>
> I am in the throws of setting up for my annual inspection.  I am going 
> to do it a little early to avoid having to work in an unheated hangar 
> in Nov.
>
>  
>
> I got a question.  For checking cylinder compress, can I just use a 
> regular auto compression checker tool?  I see where it says to do this 
> with a warm engine.  I have a few A&P school text books I hope to dig 
> out and review before I begin this too.  Also I have hooked up w/ a 
> local IA to review my work once finished, and, Ronnie, I have your 
> checklist.  Thanks for putting that out.
>
>  
>
> Any other good sources/suggestions?
>
>  
>
> Thanks in advance,
>
> Terry
>
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