>
>
> Suspicion: Several people suggested the cam sprocket had sheared off
> the key
> and begun to rotate on the shaft.

There's no key, just a taper. You have to get the cam, pump and
flywheel synced up mechanically, then torque the cam sprocket and
injector pump. This is for sure on a 1.6, probably no reason a 1.9
would be different. You may just need to retorque. However, if the 1.9
is anything like the 1.6, you couldn't get more than one tooth out and
still clear the valves.

The camshaft is the worst place to apply torque, you'll stretch the
belt and you are surely skewing your reading. Bentley warns against
this. Drop the muffler, turn the belt via the crank sprocket. You can
trust that TDC reading.

Jim