[AT] [Farmall] Super M Fan Belt -- and other fun stuff

[drupert at seanet.com]

...
The other surprise was the compression--I'd taken the spark plugs out to
make it easy to turn the engine over to get that fan belt on, so as long
as they were out I got out the compression tester.  On my '50 M the four
cylinders had tested at 115, 118, 90, and 105 psi, which as I recall folks
here on the list had said was okay for an old light-use tractor.  This SM
is in a lot better shape so I was expecting higher numbers, but not what
the tester showed:  180 psi, 175, 178, and 175.  High-altitude pistons?

What's a normal range for an SM?

Dean Vinson
Dayton, Ohio
www.vinsonfarm.net
...

Dean,

I don't know the answer to your' question but I'd like to as well.  I know
on the SH I had rebuilt several years ago now the compression, as taken
this past Spring, was 112, 115, 110 & 110.  On the SM I bought this past
Summer it measured (soon after I got it home) 100, 85, 90 & 90.

Your' readings are sure consistent and high - I guess for one of these
older low to medium compression engines I am surprised you'd get a reading
that high.

Dudley
Snohomish, WA