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Old 31-03-2019, 19:23   #1
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1982 Morgan - Yanmar engine not starting

I have a Yanmar 3GMD20 I had a partial sinking. I believe water went down the air intake of the engine, The engine is not seized and I'm able to turn the crank with the lever arms in the up position. The engine is making some compression but will not start. What exactly would I need to do to tell if there is water in there and if so, what kind of service would it need to get it out. One last note, where is no water in the oil. When I pulled the dip stick the color is black not milky, and there are no bubbles of any kind.
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Old 31-03-2019, 21:03   #2
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Re: 1982 Morgan - Yanmar engine not starting

Turn it over with the starter and see if the oil tuns into a chocolate malt. You might also be able to see evidence of water on the bottom of the dip stick. Just to be safe I'd change the oil no matter what. Have you tried turning the engine over with the starter and compression levers down/deactivated?? Assume you have since said it wouldn't start. An engine can be submerged for a day or two before things start rusting up. Hope you sprayed Kroil or some other light lubricant into the intake when you were turning it over by hand to displace any water that may have gotten in.
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