Lycoming O-360-C2D noise

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Daniel Hauf

Well-Known Member

Supporting Member

Feb 9, 2022

Hey guys,
I have removed the engine from my Pitts and have it on a maintenance stand. The prop is removed. I removed the upper spark plugs just to relieve the compression in order to turn it over by hand.
When I turn the crankshaft about every half turn there is a very audible click. Just a single click every half revolution or so.
Is this normal, and if so, or not so, what is it?
Thanks.

Dan