while replacing rings on piston the crank rotated is there a way to make sure the motor is TDC of compression stoke.

 

Well, normally you would be at TDC when both valves are closed. But since the valves aren't on yet, I don't think there's a way to tell. But, why do you need to be at TDC to replace rings? It doesn't matter. Just put them on, drop the piston in, and then put the valves & head back on.

 

Yes there is. LOL, when the piston is at the top of the stroke and won't go up any higher; your at TDC.

 

Mac I think I know what your asking the crank doesn't care what stroke it is on as long as it is at tdc the compression or exhaust stroke is determined by the position of the cam when it is at tdc