Hi<br />I had to take the boat up after hitting a rock, when I open the vent screw for drive oil to check, it came out a bit oil (grey/black-not green as I filled) like it was a pressure inside the drive, I also found some oil in the bellow. I replaced the front seal, and the shiftshaft seal before taking it out.<br />Can I have done something wrong, or could this be because off the rock I hit, and the drive went up at 3000rpm. <br />The only thing I can think off that can make pressure is the exhaust.<br />Regards<br />Affa