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Old 09 November 2014, 05:04   #1
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Country: UK - England
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Yamaha 50hp running on flushing muffs

Yamaha 4 stroke 2002 50hp

When running on cooling muffs, I get water coming out of the tell tale hole at the top, which is correct... but also from a small hole at the back of the lower unit and also from a hole underneath, near to the trim tab anode... is this correct ???

Thanks
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Old 09 November 2014, 06:27   #2
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Got a pic?
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Old 09 November 2014, 07:00   #3
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Probably, they will be the drain holes in the leg which prevent water sitting in there when not in use. I'll bet you will see water running out of them when you switch off the engine and the water. I only say probably because you've not posted a vid.
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Old 09 November 2014, 07:39   #4
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http://i669.photobucket.com/albums/v...psbcad4f7e.jpg



http://i669.photobucket.com/albums/v...ps43f23cba.jpg


http://vid669.photobucket.com/albums...ps8clzwntf.mp4
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Old 10 November 2014, 08:12   #5
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The one on the gearbox is absolutely a drain hole. The one on the leg I'm 99% sure is also as 4 strokes don't like water lying in the leg as its too close to the sump which could corrode. I can see why someone may not think its normal as water would hit the bracket, but where else do you put it. I'll bet it lets water out when you tilt it up.
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Old 10 November 2014, 13:44   #6
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My F115 has water coming out of a half dozen places on muffs (or even on the flush port.) Sounds normal to me.

jky
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Old 11 November 2014, 10:43   #7
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Normal stop worrying and enjoy using it.
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Old 11 November 2014, 10:50   #8
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I think I;m safe in saying the only one of my engines that doesn't spray water through random holes is my 1975 (designed mid 60s or so) Johnsorude 4.

But it doesn' have a telltale either - your only clue there is any water is a light spray of water & steam out the upper exhaust port - if you can differentiate it from the 2- stroke fumes!
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Old 12 November 2014, 06:58   #9
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Hi, thanks for the answers.... really helpful to know it's normal.

I'm not worrying about it, it's just that I've never owned an outboard or boat before... so what's normal to others is unknown to me :-)


Basically I've built a full test stand to check the engine out over winter to get it ready for next year when I've done the other work on the RIB, so that I dont end up at the start of the good weather buggering about with engine problems whilst trying to get the boat on the water...

At the moment I have the carbs completely stripped down, as the previous owner left it for 3yrs with fuel in and it's evaporated and gummed up the float bowls ... oh & a couple of O rings at the manifold mating face were perished
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