1997 Chrysler Sebring Camshaft will not rotate

I recently replaced my water pump in this car. When putting the vehicle back together I noticed that the vibration dampener (connected to the camshaft sprocket) would only rotate 1/4 of the way and then come to a dead-stop and make a clicking noise. Mechanics have told me to check the timing. I moved both crankshafts to TDC but could not move the camshaft because it still stopped and make a clicking noise. The camshaft will rotate 1/4 of the way. And back stopping in both directions. I took the water pump back off, timing belt tensioner off, idler and pullys back off, the reinstalled the tensioner but it still does the same thing. Could I have bent a valve possibly when taking the dampener off originally? THe other thing I could think of was could I have possibly damaged anything by supporting the engine from the bottom of the oil pan when removing the engine mount. Please help!