Is the engine installed in the vehicle, or on a test stand?

I would remove the starter and see if the engine can be rotated any other way: by the fan, with a long heavy screwdriver prying against the flywheel teeth, or putting the trans in high (if installed with a stick trans.) and rocking the vehicle forward and back...

If none of that works, I would suggest draining the oil and pulling the pan and have a look...

Maybe someone who really knows something will be along...


Professional Novice