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hunterjoe

Oil leaking from exhaust

9 posts in this topic

I have a newer Mercury 9.9 classic 2 stroke that leaks some sort of oil from what looks to be the exhaust port. I've checked to make sure the lower unit is full and it is. Anyone ever seen this? Is it something I should be concened with? The motor runs perfectly, but once I put it in the garage after running it, oil drips out. What could be causing this?

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Is it black and does it smell like gas? Most likely it's unburned gas leaking out the exhaust. Perfectly normal and nothing to worry about.

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How much? What color? Does it smell burnt? Could either be the seal around the drive shaft or just excess/unburnt oil from the motor. What do you mix it at?

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Ralph,

It is black. It does smell a bit like gas. I was out cleaning it out today and my hand smelled like gas after I was done.

Thanks for the help!

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Caman,

I mix it at or just above 50-1. Not much above if at all. No, I don't think it smells burnt. I haven't really tried to smell it, but like I said in my previous post, it does smell like gas.

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Sounds like unburnt gas / oil mixture from the engine.

Check your lower unit in a month or two and see if it's still full.. I suspect it will be...

marine_man

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It's done that for a couple years now, and it's never lost any lower unit oil. Is there a way to stop or minimize it? Or is it just one of those things that happens?

Thanks for all the help guys.

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my 5.5 motgomery wards motor (same as jhonson) started leaking gas out of the port like crazy, but when i shut the gas off it quit.. what could be doing this?? damaged float??

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It's done that for a couple years now, and it's never lost any lower unit oil. Is there a way to stop or minimize it? Or is it just one of those things that happens?

Thanks for all the help guys.

Not much, other than making sure you mix at 50:1 as you said you do, and I've heard others say switching to Amsoil has helped a little. It's just one of those things

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