I've drained the oil from the gearbox of my evinrude 150DI and it's come out emusified and black
smells a fair bit too
I haven't a clue what was used in it at the last service, so got no idea what colour the original oil used was. It's been in there two years and about 50 hours of use.
Anyway, I'd like to pressure test the gearbox and can lay my hands on a manometer to do this. What sort of pressure can I pump in there to give it a good test? I thought 3-5psi?
Picture to follow: