If the timing belt had jumped tooth, the valves would prevent the pistons to go over the top to make the turn.
Release the rocker arm adjusting bolts and back off till the cam lobes do not contact the rocker arms and retest. If you are not able to turn the crankshaft any further, try turn anticlockwise and if the crankshaft is restricted after some turning angle, you would have to remove the cylinder head to check what is restricting the movement. It could be due to bent valves or somethin getting into the engine.
Was anything done prior to this occurring?
Tuesday, August 30th, 2011 AT 5:23 AM