Grey foamy substance out of propeller exhaust

[kamikaze]

FLBuilder:

Do you use walmart/Penzoil TCW3 oil with decarb/cleaner additive by chance?

Kamikaze

[phatdaddy]

sue bp, everybody else in florida is.

[macojoe]

if at the prop its like CB said! OMC needs to be cleaned up of carbon to fix, do a decarb and use carbon guard in the gas from time to time! It's a OMC issue. Also for giggles look at the lower unit oil, if its low its leaking out, if its milky your leaking in, if clean its the unburned oil from above.

Good Luck!

[BuilderFL]

I use the west marine 2 cycle oil, premix. Woke up early to work on the boat and its been raining hard.

[BuilderFL]

Found the culprit; oil seals below water pump base were not installed correctly when I replaced the water pump. Thanks guys!

[BuilderFL]

I was using the wrong O ring at the base of the water pump and it did not go all the way in. Well, I replaced it and it's doing the same thing. Could it be the Sea Foam?
Joe, whats the OMC?
And there is no oil from the lower seal.

[smokeonthewater]

Originally Posted by BuilderFL

whats the OMC?

OMC is the parent company, Outboard Marine Corporation, that makes Johnson and Evinrude engines.

I think Joe missed that it was a Mercury