What is this hole suppose to be for? It sits right behind the Tensioner Bearing race and it looks like you'd pack Grease in there. However when I pulled off my Tensioner there was some rock hard brown stuff looked like Silicon and smelled like fish. I was told they put Silicon in it from the Factory. "The Block is really thin there and, the Silicon help absorb heat". Well I ripped it all out and, now i'm trying to findout what hell to put back in it???