Got to the field for a local flight... started my daily inspection by rolling
the
prop over by hand; 3 out of 4 cylinders presented compression... ripped the
lid off and started pulling plugs; #2 cylinder... turned on compressor and got
the leak tester out; compressor died, offgrid hangar battery drained to zero...
had enough air to run a diagnostic... marginal air escaping into crankcase
and exhaust... bolted it all up and rolled it over again; some progressive
improvement
and still low on compression... finished DI and rolled 181 out of the
hangar for ramp checks; started and ran perfect as normal (possibly just a fleck
of carbon caught under a valve seat on previous shut down)... increased rpm
to 2500 and got minor vibration, pulled back to idle and no vibration...
increased
rpm to 3500 for runnups, ran normal no vibration, increased rpm again
to 2500, vibration... checked again with aux fuel pump on and also with fuel
taps off; no change in vibration status... entered the field for some WOT ground
runs; ran great... decided to not fly until source of vibration found... will
start with propeller tracking... looking forward to rolling the prop over again
when cold and see what presents!
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