Quote:
Originally Posted by benzdude42
The motor is easier to turn by hand until one of the pistons hit the top of its stroke, unknown which, and then requires more effort and I hear a very small clack.
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Does it do this every crankshaft revolution or every other one?
If every rev you probably have something in a cylinder. As the piston rises the object hits the head.
If every other, you have a valve sticking or something on a piston just below a valve.
Pull the valve cover and see if you can coordinate valve action to the sticking. ( Turn the engine just until it gets tight, see if any rocker arms have lots of lash. )