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  #31  
Old 07-11-2013
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Re: Fuel in oil - where to start?

{run_routine:"premature_celebration"}

WOOHOO! Water detection paste shows NO WATER! It must just be a large amount of fuel. On with the carb rebuild, and see where we go from there. WE MAY BE IN THE WATER THIS SUMMER BOYS!
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Last edited by Skagit; 07-16-2013 at 04:55 PM. Reason: Disappointing lab results
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  #32  
Old 07-16-2013
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Re: Fuel in oil - where to start?

{end_routine:"premature_celebration"}

Crap...sent the oil in to a lab for analysis. Positive for water and antifreeze. Ah well, at least I understand possible sources of fuel contamination better.
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  #33  
Old 07-16-2013
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Re: Fuel in oil - where to start?

Paste says no, lab says yes...OTOH I'm glad that what I remembered (milky oil is water contamination) has been upheld. OTOH...sorry to hear that. I guess that also means the paste is good for gross contamination, i.e. separate layers of water, rather than water that is mixed in nicely.
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Old 07-16-2013
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Re: Fuel in oil - where to start?

If you are raw water cooled where did antifreeze come from? If not raw water cooled you should have some evidence in the heat exchanger. Either loss of coolant or muck in it.
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Old 07-17-2013
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Re: Fuel in oil - where to start?

Quote:
Originally Posted by Mechsmith View Post
If you are raw water cooled where did antifreeze come from? If not raw water cooled you should have some evidence in the heat exchanger. Either loss of coolant or muck in it.
PO winterized with antifreeze...only so many places it can come from and all are expensive. Going to pull the engine in the next few weeks and see what we got.
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Old 07-17-2013
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Re: Fuel in oil - where to start?

Quote:
Originally Posted by hellosailor View Post
Paste says no, lab says yes...OTOH I'm glad that what I remembered (milky oil is water contamination) has been upheld. OTOH...sorry to hear that. I guess that also means the paste is good for gross contamination, i.e. separate layers of water, rather than water that is mixed in nicely.
Yeah, the paste just doesn't have the sensitivity to pick up small amounts of water in emulsion. Lab results came back as 5% water. That's after 10 min of running.
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Old 08-06-2013
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Re: Fuel in oil - where to start?

In case anyone's following this...here's the latest.

Took the head and exhaust manifold off, both look sound. I'm 99% sure I'm the victim of a poorly designed exhaust system. With the exception of about 6" of downhill exhaust pipe, the entire exhaust system is above the manifold discharge. With the static level of the water in the pipe, I figure I have less than a pint of capacity before I've got water backing up into places it shouldn't be (valve seats). Given the slow starting and long cranking required (before the carb rebuild), I think I was backing water up into the engine, hence the water in the oil.

I plan to build a proper exhaust riser with an injection elbow and get to going!
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Re: Fuel in oil - where to start?

skagit, when you question the exhaust design, is this a production boat or a backyard builder's home special?
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Old 08-06-2013
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Re: Fuel in oil - where to start?

Is there an anti siphone valve set up above the exhaust loop? If so is it working?
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Old 08-06-2013
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Re: Fuel in oil - where to start?

Hey there Skagit. Where are you working on your project? Located at home on the hard . . . or Somers or Dayton? It would be fun to pop by and take a look sometime.

Regards,

markb
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