Oh crap! Last trip of season and I think a seal broke. Oil looked good all year then I was on lake mich. And all of a sudden WHAM! I shut it down. Prop would spin when out of water but as soon as I put it down it won't push the boat. Very grindy sounding. Drained the oil brown tint instead of golden. No metal shavings any advice would help or am I screwed. Thx. 1986 Omc 2.5 L