Means ur gasket is ripped or gone if its leaking out of the crankcase. Just make a new gasket with cardboard (NOT THE RIPPLED STUFF, CEREAL BOX CARDBOARD) you can buy gasket paper of course but i find it harder to work with as it rips. Also u could buy a genuine gasket but why? Homemade gaskets are the exact same, never had one of mine fail on me b4. Only gaskets u ever gotta buy is the non paper or rubber ones like head gaskets, cylinder gaskets and exhaust gaskets.