K159BON

Hi guys, i would like to ask info .about 2002 rx7 13b engine. i would be grateful if some1 can help me out.
Basically Coolant goes straight into oil pan so fast.I have check all the freeze plugs but all looks like new. I took the engine off from the car to see it better or if anything rebuild the engine.
So took the oil pan off and pour the water , water comes from centre iron into the pan . I only notice 1 of the bolt on the centre iron is too short . is it the right size or it has to be long 1. I also attached picture to see and

is it right bolt? it looks like it has to be long one.
understand better. thanks from advance .