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Yamaha 4 stroke 150hp spitting water

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Yamaha 4 stroke 150hp spitting water

Old 07-19-2014, 07:19 PM
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Default Yamaha 4 stroke 150hp spitting water

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?
Old 07-19-2014, 07:26 PM
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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
Old 07-19-2014, 07:34 PM
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Yamaha's don't have model years, only date of manufacture. What exhaust hole are you referring to? The pee hole?
Old 07-19-2014, 07:35 PM
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And when was the last time your impeller's were replaced?
Old 07-19-2014, 07:38 PM
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Did you even read the guys post?
Old 07-19-2014, 07:39 PM
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The impellers are replaced annually. Water is flowing strong out of the pee hole.
Old 07-19-2014, 08:09 PM
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Where is the poppett valve ( pressure relief valve )
located and what does it look like?
Old 07-20-2014, 03:03 PM
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http://www.boats.net/parts/search/Ya...202/parts.html

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Old 07-20-2014, 05:50 PM
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http://www.thehulltruth.com/boating-...a-engines.html
Old 07-21-2014, 02:24 PM
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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.
Old 11-11-2014, 11:32 AM
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Originally Posted by CurrentObsession View Post
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.
I have the same symptoms going on on my OX66 - 200Hp. Interested to hear comments... Did you fix the problem?
Old 11-11-2014, 02:42 PM
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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.
Old 11-11-2014, 03:43 PM
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Could it be the dreaded exhaust corrosion issue starting;?
Old 11-12-2014, 05:22 AM
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Originally Posted by HTJ View Post
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.
Motor is running fine. No issues besides the bubbling and the water coming out of the exhaust ports.
Little video:

http://youtu.be/xoQCSwUKvWo
Old 11-12-2014, 07:18 AM
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Originally Posted by Cayo71 View Post
Motor is running fine. No issues besides the bubbling and the water coming out of the exhaust ports.
Little video:

http://youtu.be/xoQCSwUKvWo
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...
Old 11-12-2014, 05:07 PM
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Originally Posted by Commocean View Post
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...
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.
Old 11-13-2014, 12:09 PM
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Originally Posted by Cayo71 View Post
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.
My bad, I made the wrong assumption they were 4-strokes...I've never heard of it on the OX66 either...
Old 11-13-2014, 01:59 PM
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Originally Posted by Commocean View Post
My bad, I made the wrong assumption they were 4-strokes...I've never heard of it on the OX66 either...
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....
Old 06-02-2016, 11:11 AM
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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.
Old 05-26-2017, 06:39 PM
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Any info on this? Having similar issue

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