Not building compression It should be hard to turn. It is not designed to rotate in opposite direction.
The engine has a crankshaft that is connected to all the pistons in the engine. When the engine is running the pistons are moving up and down and are turning this crankshaft. The crankshaft in turn is spinning a shaft connected to the transmission. The transmission is turning a driveshaft that is connected to the differential which in turn is turning an axle connected to the wheels.
500 rpm
It engages the accelerator in an engine to give you momentum to move forwards or backwards depending on which direction you wish to travel.
It could be bad with out turning the light on.
chemical (burning of the gas) to mechanical( the cylinder pressure turning the crankshaft).
chemical (burning of the gas) to mechanical( the cylinder pressure turning the crankshaft).
Half the speed of the crankshaft, 2750 rpm.
Looking from the front of the motor it is turning clockwise, sitting in drivers seat it is counter-clockwise.
check the crankshaft and/or camshaft position sensors, if they are not working the ECU will not "see" the engine turning, therefore no need to spark..
Fuel is injected into cylinders. Spark plugs ignite it. Piston goes down turning crankshaft. Repeat.
It is possible to overfill an engine with oil. It can cause some damage, but mainly it will decrease power and fuel economy because the crankshaft is turning through the oil which adds resistance to the engine.
Assuming by crankshaft bolt you mean the one at the front of the engine which usually retains the front drive-belt pulley: It is always threaded so that it is tightened in the opposite direction to rotation of the engine. Hence loosened by turning in the same direction as the engine's rotation.