Oil from exhaust

[aeviaanah]

I just rebuilt a 1962 15 hp Sea King. Never owned a 2 stroke motor before this. I got her to run and she runs great. When testing in a barrel, I notice oil begins to pool up after idling for 5-10 minutes. After 10 minutes or so I may have around 1/4-1/2 ounce of oil floating in barrel. Is this normal for an old motor like this? Im thinking 25:1 that oil has got to go somewhere. I know running in a barrel isn't the best thing but my muffs wont work for this outboard. I swirl a rag around the water and it soaks up the oil pretty fast, this way oil doesn't make its way through the cooling passages.

 

[Johny25]

This is completely normal for a 2 stroke especially when just idling in a barrel. My 15hp and 30hp 2 strokes do the same thing when running in a barrel. Obviously though if it is too much then you have a problem. But you are running 25:1 so there is going to be more oil. I don't know the 60's models well so I don't know how much exhaust oil is left from running them in a barrel. This is why all the manufacturers have went to 4 strokes, to help keep the waterways cleaner.

 

[JMichael]

As said, you're going to see some oil on the water when running in a barrel but ½ oz. in 10 minutes seems a bit excessive to me. But I'm also not use to running one on 25:1 either. If you're not seeing any water in your lower unit oil and you're not having problems with the oil level dropping in it then I'd say just keep on running it.

 

[bbstacker1]

Sounds normal for an old(er) engine. Some models are much worse than others. I have a couple of 7.5s and a 5.5 from 55 to 57, none of those three are bad at all, I have a couple of 10's, both early 60's and both are terrible (all these are Johnson's mixed at 16.1 or 24.1). I think on the older motors, the bigger they are the worse they are. I have a 2002 Mercury 15hp 2 stroke that is not bad at all.

 

[aeviaanah]

thanks for the replies everyone!