I changed the oil and oil filter and now oil is pouring out of what looks to me like a relief valve on the right side at about a litre a minute. The exit is from here: 188.8.131.52/Templates/IMG.jpg (sorry, I don't have image posting privileges) I'm pretty sure the filter is the right way around. Is that hole a pressure relief? Is it actually a valve that may be stuck open? I may have put too much oil in and popped the 20 year old valve which then stuck open...?