Water in cylinder: In line 6 1970 reinell

A

ancpurser

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Aug 7, 2009
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1970 reinell, ran fine, 120 psi in cylinders, great compression, timing is right on, took boat out 4 times, 5th time, found water in #5 cylinder. Pulled plug, water shot out, took boat our ran great 3 trips out. Took out again found water in #6 cylinder. Once water is removed boat doesn't hesitate to start, runs and idles great. What would cause water in cylinders? head gasket, manifold , exhaust? boat runs great but occasionally gets water in cylinder #5,6. what the heck is goin on with this?
 
J

jtybt

Senior Chief Petty Officer
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Aug 5, 2009
Messages
730
Re: Water in cylinder: In line 6 1970 reinell

Blown head gasket would show some comp variation in affected cylinders. So most likely you have water leaking from manifold/elbow joint. How old are they?
 
ziggy

ziggy

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Jun 30, 2004
Messages
7,473
Re: Water in cylinder: In line 6 1970 reinell

this is a good read. maybe it'll help... http://www.boatfix.com/merc/Bullet/01/01_13.pdf
i had water intrusion too a while ago. mine was water in the oil. the cause was for sure the manifold. replaced the manifold, the riser was replaced on general principles.
 
bigskiohio

bigskiohio

Master Chief Petty Officer
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May 3, 2008
Messages
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Re: Water in cylinder: In line 6 1970 reinell

How did a exhaust manifold put water in oil? Wouldn't it put it in the cylinders too. What ways can you get water in oil , a crack for sure but any other ways?
 
A

ancpurser

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Aug 7, 2009
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Re: Water in cylinder: In line 6 1970 reinell

I didn't have water in the oil though. I checked to see if it was "milky" and its not. Just randomly once in a while i get the water in either #5 or #6, not in other cylinders. I am wondering if it has something to do with the exhaust. i also did notice that above the exhaust boot by outdrive, there is a hose that is braided, about 1 inch in diameter, and it has a small hole in it. I don't know what the small hose does, but maybe that is causing it.
 
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