1977 Evinrude 4hp oil/water "goo" coming out of the exhaust.

[Sunbirdy]

As the title says, there's grey goo (Like water/oil mixed ) coming out of the 4 vertically-oriented engine water outlet holes on the rear of the "leg". Only on one side though. Its a 2 cylinder motor. Any ideas are welcome. Thanks.

 

[Daviet]

Re: 1977 Evinrude 4hp oil/water "goo" coming out of the exhaust.

Sounds like a common situation, unburnt fuel mixture mixing with the carbon in the exhaust housing and the exhaust blows it out.

 

[Sunbirdy]

Re: 1977 Evinrude 4hp oil/water "goo" coming out of the exhaust.

I'll pull the spark plugs and see if one cylinder is not firing. Just replaced the coils though.

 

[Daviet]

Re: 1977 Evinrude 4hp oil/water "goo" coming out of the exhaust.

On a 2-cycle engine you will have unburnt fuel in the exhaust even if the engine is running properly. If the engine is running on both cylinders, it is a normal condition. Take it out on the water and run it at high speed, it will clear it out.

 

[Sunbirdy]

Re: 1977 Evinrude 4hp oil/water "goo" coming out of the exhaust.

On a 2-cycle engine you will have unburnt fuel in the exhaust even if the engine is running properly. If the engine is running on both cylinders, it is a normal condition. Take it out on the water and run it at high speed, it will clear it out.

Bad news! I started the engine up this am thinking I'd warm it up then check the spark plugs. It ran, then quit and when I pulled the plugs, the lower one had water drops on the electrode. Water was getting in to one cylinder somehow. I think this little motor might be finished.

 

[Daviet]

Re: 1977 Evinrude 4hp oil/water "goo" coming out of the exhaust.

Maybe not, pull the head and check the condition of the head gasket.

 

[Sunbirdy]

Re: 1977 Evinrude 4hp oil/water "goo" coming out of the exhaust.

Maybe not, pull the head and check the condition of the head gasket.

I'm going to expose my ignorance here and say that I've never worked on an outboard before. I'm assuming that this head removal can be accomplished easily without removing the powerhead by removing the head retaining bolts then gently prying the head loose?
Thank you in advance.

 

[nwcove]

Re: 1977 Evinrude 4hp oil/water "goo" coming out of the exhaust.

yep, should be an easy job, just be carefull not to break any of the head bolts. a new head gasket should be less than 10 bucks.

 

[Sunbirdy]

Re: 1977 Evinrude 4hp oil/water "goo" coming out of the exhaust.

Thank you. I shall give it a try.