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O6 Yamaha 150 4 stroke producing oil

Lorenzo

New member
My outboard is producing oil after a few trips, but no sign of any water. I have been changing oil every few trips however I'm sure something is going on and I need advise. Also, the motor is a lot louder as if it has a bad muffler. Strangely, the motor runs good and hard.
 
I think problem could also be caused by a failing diaphram in the mechanical fuel pump(s) driven by the overhead cam. If a diaphram starts to fail on one of those pumps you can get fuel leaking into the OH cam = making oil as fuel is being added to the oil. The mechanical fuel pump(s) should be on the rear of the engine in plain view with the fuel lines entering and exiting.
 
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