It sounds to me like you might have some bent connecting rods. Water does not compress and acts like a brick wall if it fills the cylinders. You've removed the plugs so try turning it over by the harmonic balancer. Its a 15/16 socket. If its only turning one way then it doesn't sound good.basically the truck won't crank, after sucking some water into the engine The starter is not the problem it is just unable to turn to the engine while all the spark plugs are removed. Yet if you remove the starter the flexplate is turnable by hand with the help of a screw driver in only one direction. Any information or suggestions would be greatly appreciated.