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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


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  #1  
Old 12-19-2009
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Water in engine oil

getting water in my engine oil on my yanmar...is it head gasket or some other defect///
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Old 12-19-2009
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Raw water or coolant water? Head gasket is a possible source, as the gasket can fail and the coolant water can seep down into the pan where the push rods come up through the block. If you bring the motor up to operating temperature and pull the valve covers off, you may be able to see a leak down the push rod space with a flashlight and mirror.

Other sources of water leaks are oil coolers and water pumps (if the water pump bolt on to the engine)..
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Old 12-19-2009
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Also, is there oil in the coolant water? The lack of it might tend to rule out oil/water interfaces such as the water pump or oil coolers.
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Old 12-19-2009
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Is this in combination with any other abnormal engine behavior? Hard starting... different colored smoke from the exhaust, etc.?
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Old 12-20-2009
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Uhmmm I am not expert but running a engine with water in it is not good. It takes infinite pressure to compress water. It will not compress. Don’t run the engine if you can help it. If you get enough water say from a head gasket leak, cracked block ECT…It will rune the engine beyond repair or at least beyond what it’s worth. Get a mechanic to look at it. The price you pay might just say you a bundle of cash.
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Old 12-20-2009
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Garffin - I'd love to agree with your point about getting a mechanic, but I can't. We've been having engine issues going on 6 months now - hard starting. We spent over $2k on mechanics and over $2k on parts, and continued to have the issue. Each mechanic had their own diagnosis. None of their "fixes" fixed the issue. ALL but one of the mechanics were highly recommended by other cruisers. We think we have it narrowed down now and will try things out in the Spring. I would highly recommend getting Nigel Calder's Boatowner's Mechanical and Electrical book and doing some of your own diagnostics first. I agree - water CAN ruin your engine - we had lots of water in our system, including our oil (most likely entered due to continuous cranking when trying to turn the engine over), and I think we have a slight leak in our head gasket (oil analysis showed small amounts of coolant in the oil too) due to overpressure from a partial hydraulic lock. It's not good to run with problems for too long
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Old 12-21-2009
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Porous liner? head gasket? oil cooler probs usualy get oil in water rather than water in oil .K
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Old 12-21-2009
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Probably not your head gasket. Do a wet, and dry compression test, bring us back the #'s, and you will probably have your answer. Also we will need the make and a serial # off the block would go a long way in helping with your diagnosis.
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Old 01-01-2010
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Are you sure its not coming from the tank? Usual culprit here is a bad O-Ring on the deck fill. Ours had almost 10 gallons total in the 5 tanks when we took possession. Both Racor filters were full of water and the delivery jocky had to feed directly from a fresh portable tank.
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Old 01-02-2010
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Is your Engine

Below the waterline? I could be a stuck anti-siphon valve.

Fair Winds

Dave
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