I have a 2006 Johnson 115 hp outboard that leaks oil at the prop shaft

[[email protected]]

My outboard leaks a slight amount of oil out the prop shaft even after replacing the seals a total of three different times. I can pressure test the lower unit and get no leaks. I hesitate to buy a new prop shaft as they are expensive and not a guarenteed to fix my problem. What are my choices to correct this problem?

 

[racerone]

Could be normal for unburned oil to leak there !

 

[fitz73222]

What color is the oil? Does the color match the color of the gearoil you put in it or is it black and smells like gasoline?

 

[Droid]

2006, is that a 2 stroke or Suzuki based 4 stroke?

 

[timguy]

If it truly is gear oil, how does the shaft surface look where the seals ride? Installing the seals like this?

 

[[email protected]]

The seals have been installed just like the picture above. The oil is jet black, not sure if it smells like gas. Johnson is a 2 stroke. Prop shaft is smooth.

 

[racerone]

Likely normal for a 2 stroke.

 

[fitz73222]

Do you do a lot of idling with this engine? That can contribute to the excessive unburned fuel drip.

 

[kevinj]

Agreed, likely normal 2-stroke exhaust oil. You could possibly have weak spark due to worn spark plugs. Make sure you have a fresh set of properly gapped Champion QL78YC spark plugs in the engine. Do not substitute other brands of spark plugs, the OIS 2000 ignition is very sensitive to RFI & MFI noise and the Champion plugs meet the specs exactly.

Also, I'm pretty sure 2004 was the last year for Johnson 2-stroke outboards.