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Save money, start with simple things. In your model of Cherokee you may have the single master/alternator switch, if not you have the split switch, in either case try a good shot of contact cleaner into the switch, even try wiggling the switch during operation, if the neddle settles down the...

Dan, I had those same thoughts. However with the vacuum pump pad off I can physically see the camshaft doesn't move for those two degrees of rotation of the crank that I talked about in my post. This occurs at any point on the rotation. 3934V, I looked up those values for backlash, and...

Hey Everyone, Hoping someone can shed some light or provide insight to a problem I think I may have. I have a One Design DR-107 with a Lycoming O-360. Recently I noticed a "slop" in the rotation of the propeller when turning by hand, wasn't much but definitely more than other aircraft...