You will have better luck trying to turn the flywheel than tapping the pistons. It’s near or at top dead center and rods have no leverage on the crankshaft.
Yes a piston at the top or bottom is not the best. A shock wave might make a difference. It’s like tapping a crankshaft when removing a flywheel. Or maybe you seen a mechanic tap a tie rod end on the side to get it separated. My dad used to say,” don’t force it get a bigger hammer”. That might not apply here but the concept is the same!
dale
get’em wet….don’t let’em set!
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