It does sound like your cam chain cam off the lower sprocket of the crank. If you have ever seen the aluminum holder which goes over the crank (it holds the roller which the cam chain tensioner pushes against), it has an aluminum rubbing block which the chain drags across when the engine is new and helps keep the chain from coming off the lower sprocket. That your chain came off the sprocket may indicate the rubbing block isn't doing its job.
Remove the chain tensioner and take the chain off the cam sprocket. You may be able to get the chain back on the lower sprocket without having to remove the cam. If not, you will have to remove the cam to get more slack. You may need to use a narrow rod to push the chain to the left or right to get it to line up back on the lower sprocket. With enough slack and some patience, you can get it back on. There is a roller where the piston TDC is located which will prevent the chain from falling into the engine. If the chain should slip, you can retrieve it with pliers or a coat hanger. You can turn over the engine with a 17mm wrench on the pulley bolt (put the transmission in neutral) which is attached to the crank.
good luck,
Dale
> I have just put new gaskets and a cam chain in my coupe. I followed > Bill's directions for the cam chain, and everything was just peachy. I put the > cam back in, got the chain on the sprocket, installed the tensioner, and WALA!
> the chain cam doesn't turn! The pistons move when the car is in gear and > moved. The chain seems to be in the right place because everything is taught > with the tensioner in place, but me thinks the chain is not on the bottom > sprocket. Could this be, and if so, what have I done wrong. And more > importantly, how do I fix it.