i am putting my jet pump back on my 1996 xp 787.. i have put the pump on when i put the rattle cone on. i cant turn the engine by hand? as soon as i undo the cone it free's off. how tight do the 3 8mm bolts have to be?? i didnt remove the black cover under the pump so dont no if i have the drive shaft as far as it needs to be in the impeller.. but the pump seams to have bolted up ok to the body. and does turn. i still got i little bit of to and from play in the pump like there should be.. i have not stripped the pump at all..