2002 90hp 4 stroke leaking oil out of exhaust

[audiocontr]

Ive owned the boat for less than a season, but noticed a rainbow coming out of the back of the boat into the water which i assumed was a worn lower unit seal. I pulled it out this weekend and found the seal was fine. Instead Ive noticed a cloudy white trail coming out of the exhaust. It appears that there is a moderate leak of engine oil out of the exhaust port (Which explains how i went through oil so quickly). The leak happens continuously. My guess is a worn seal somewhere around the exhaust? maybe an oil cooler?

This is my first boat, but I'm a strong shade tree mechanic (owned 35+ vehicles in my 25 years of driving). Any tips of what to focus on?

 

[Silvertip]

You have a four stroke motor. Is it the engine oil level that you are losing or is it the lower unit oil. Whitish or milky lower unit lube is a sign of water intrusion into the gearcase. Bad seals are the issue. You cannot tell a good seal from a bad one unless you pressure/vacuum test the lower unit.

 

[audiocontr]

I popped the lower unit screw off the bottom and no water leaked out. Only blue oil. My assumption is that water would have sunk to the bottom if there were a leak there. The oil coming out of the exhaust is much higher than the lower unit oil. Its whitish milky directly out of the exhaust hole

 

[racerone]

Replacing lower engine seals on a 4 stroke outboard is not an easy / cheap fix.----Next step is to find a shop willing to take on that type of work.