CurrentObsession

I have a pair of 2008 Yamaha150's, my port engine started to spit water out of the exhaust hole on the rear of the engine which is located right below the engine cover. The engine running temperature is normal and other than this water coming out and some bubbles I see from the lower unit when I am at idle everything runs fine. Does anyone know what the cause and cure is?

Airbus A320

You may need to remove and clean and or replace your poppett valve ( pressure relief valve )

It may be stuck open with some sand or crud causing what you are describing.

Very easy job

Fish'nFool

Yamaha's don't have model years, only date of manufacture. What exhaust hole are you referring to? The pee hole?

Fish'nFool

And when was the last time your impeller's were replaced?

Airbus A320

Did you even read the guys post?

CurrentObsession

The impellers are replaced annually. Water is flowing strong out of the pee hole.

CurrentObsession

Where is the poppett valve ( pressure relief valve )
located and what does it look like?

Airbus A320

http://www.boats.net/parts/search/Ya...202/parts.html

#6

NEBassMan

http://www.thehulltruth.com/boating-...a-engines.html

CurrentObsession

I removed the pressure relief valve and cleaned it out. It had a little bit of sand but in my opinion not enough to cause a problem. Started the engine and still spitting the same way. Also a lot of bubbles coming from the lower unit.

Cayo71

I have the same symptoms going on on my OX66 - 200Hp. Interested to hear comments... Did you fix the problem?

HTJ

Is the motor running okay? Reaching full RPM?

Hopefully it isn't but water getting into the upper exhaust almost sounds like a blown head gasket or cracked head. Poppet valve is isolated to the cooling system. I would pull the plugs and see if one or more look odd to the rest.

parrott

Could it be the dreaded exhaust corrosion issue starting;?

Cayo71

Motor is running fine. No issues besides the bubbling and the water coming out of the exhaust ports.
Little video:

http://youtu.be/xoQCSwUKvWo

Commocean

I'm not trying to be an alarmist, but if I recall, that bubbling was one of the early signs of exhaust corrosion...Your issue may, or may not be related...

Cayo71

Geeezzzz. Hope it is not. I never heard that on the OX66. I'll pull the lower unit and check. Hopefully it is just the exhaust gasket not sitting properly against the lower unit.

Commocean

My bad, I made the wrong assumption they were 4-strokes...I've never heard of it on the OX66 either...

noelm

NO, there is two threads going at the same time, the original post was about a 4 stroke, then half way through, a 2 stroke question was asked....

Teasem

So did anyone ever figure out what fixed the problem or what the problem was to make this motor bubble and spit water on the 4 stroke? I am having the same problem now that just started this past weekend.

Mikeg1585

Any info on this? Having similar issue