What is this hole and why is there oil leaking out of it?

natetrack · Jun 15, 2008

The subject explains what I'm looking for. The motor is a mercury 25 horse tiller serial number A709604.

Any help? Suggestions?

The hole is located up and to the right of the vent screw in the lower unit, it didn't leek before i put it in the lake today, but now it does.

bassboy1 · Jun 15, 2008

I am not familiar with mercs, but the Johnson/Evinrude motors have a vent hole that allows water and unburnt 2 stroke oil to exit the midsection and exhaust housing. Contrarily, yours looks a little lower than what that should be, but as I said, I don't know the insides of mercs. Also, that oil looks a little thick for unburned oil and soot. Maybe it is just a bad picture, I can't quite tell.

natetrack · Jun 17, 2008

After doing some checking, i have a torn boot on my shift linkage and this is lower unit oil that is leaking out of the vent hole.

sccamper · Jun 19, 2008

Heres a pic of my Johnson 20hp. The hole in pic had a milky discharge also. Found out is what bassboy was refuring too.

tholdah · Jun 23, 2008

sccamper said:
Heres a pic of my Johnson 20hp. The hole in pic had a milky discharge also. Found out is what bassboy was refuring too.

I had a milky discharge once in college...a little penicillan will clear it right up.

What is this hole and why is there oil leaking out of it?

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What is this hole and why is there oil leaking out of it?

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