[rebuilder?]

I have a v6 4.3,when I turn crank over by hand
there is play before pistons move,is that normal or should everything move at once with out play.
by that I mean I can wiggle crank clock/counter clock wise before pistons move

[TurboS10]

If there is play at the bearing, you have big problems or have missized bearings.

chris

[engineguy]

If you are referring to piston movement at top dead center, then yes the crank will move SLIGHTLY before the piston moves. This is because the piston "dwells" at TDC for a few degrees as the crank changes direction. This dwell time is affected by the length of the connecting rod, as an engine with long rods will have more piston dwell at TDC and less dwell at BDC. However, at any point other than TDC, your piston should move with the crank, otherwise you have some real serious bearing or wrist pin problems.

[Copper Top]

are your heads off? what you may be feeling is slack in the timing chain.

[rebuilder?]

Thanks for the info ,to be safe Iam going to pull crank out and have it check.Ihave movement where ever piston is located.