40hp elpto

[bwmc79]

I have a 1990 merc. Just below the cowl on the back of the motor are two rectangular vents. What are these for?I think I have some kind of oil -water mixture coming out of these!

[boats.net]

They are the exhaust relief holes.

[bwmc79]

40 hp ELPTO

What could cause a milky substance to emit from here?

[boats.net]

There is exhaust and water comes out there, if have unburned gas or oil it will look milky.

[bwmc79]

40 hp ELPTO

Do you about how much to repair?

[boats.net]

You must first find out what the problem is. Over oiling, fouled spark plugs, carburetor adjustment, these are possible causes of your symptom.