Actually just to add to that comment of mine above. I learn't this task very early on in my life. I was still a Kid at school
. We had a tractor on the farm. I put it in gear
to move it forward while my Dad had opened the gate. It stalled with an enormouse Bang. Sio hard and loud, it shot the dipstick high into the air. I tried to restart, but the engine
seemed to be siezed solid. We towed it home with the suumption it had had a major and was siezed. No ever tried turning the engine over again. We totaly stripped it down and expecting to find a major problem. We found absolutely nothing. We reassembled it and to our shock, it started right up and ran for many years afterwards without a hickup.
I learn't a very big lesson way back then, and have never forgotten it.