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Old 27-04-2009, 06:35   #1
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Water in Cylinders - Yanmar 3GM

I am working on a Yanmar 3GM that is freshwater cooled. Upon removal of the air filter, about a pint of rusty water came out. The engine has not been used in almost a year.

I am assuming that the water came into the cylinders through the exhaust, as it does not have a siphon break.

The decision to be made is to try and repair the engine or junk it. By the way, it appears to be in excellent condition otherwise, and apparently has very few hours on a rebuild done prior to getting water in it.
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Old 27-04-2009, 08:12   #2
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At the least you'll need to pull the head to get rid of the rest of the water in the cylinders and inspect them. Chances are very good that there is too much internal rust damage if it sat for over a year but you never know until you pull it apart.
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Old 27-04-2009, 09:46   #3
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Before you go ripping things apart, make sure the water is not rain water that has got into the boat and collected in the air filter.

Then if you are certain that it originated from the raw water circuit and entered the air filter via the cylinders, pull the injectors and try turning the engine over and ejecting the water. After a year of raw/salt water in the cylinders I would expect the engine to be total locked from corrosion. That being the case I wold seriouly start looking for a replacement.
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Old 27-04-2009, 10:28   #4
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Thanks for ithe replies

It would be nice if it was just rainwater. I will check that out. The good news is that this engine has sleeves in the cylinders, which might save it even if it had water in it for some time. I could see a scenario that calls for new sleeves and pistons.

By the way, the oil looks good (at the dipstick). I will drain it tonight to get a better look at it.

Mike
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Old 27-04-2009, 20:37   #5
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Pull the injectors, put a mix of diesel and oil into each cylinder.

You didn't say if the engine is seized

Let the mix sit for a couple days and see if you can manually turn the engine over

I await your reply
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Old 28-04-2009, 06:23   #6
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Water in cylinders

I will do the oil/diesel mix in the cylinders. What ratio of oil and diesel do you recommend? Also, about how much should be put in the cylinders?

I went to the boat last night. The water that is in the air filter is fresh, not salt. I am hoping that the water is rainwater that got in the boat; I am not sure how it got in. My impression is that the engine is not seized.

Thanks,

Mike
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Old 28-04-2009, 07:56   #7
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Before you removed the air filter, which way was the intake oriented? I.e. was it pointing up by any chance? That seems like a lot of water even if it was, but the intake should point downward to help keep water out.
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Old 28-04-2009, 08:27   #8
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The intake was pointed down. That makes the rainwater idea less likely. On the other hand, I don't know that it was not pointed upward during the past 8 or 9 months.

I guess the next step it to pull the injectors and see if there is water in the cylinders.
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Old 28-04-2009, 11:45   #9
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try turning it over by hand(wrench) there may be no water at all
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Old 28-04-2009, 15:48   #10
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If it wont turn over and water's been sitting in it for a year... it's probably toast. But it is wierd, if it got water inside the exhaust and siphoned into the engine and then filled the air breather through an open intake valve... it should be filling the boat right?
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Old 28-04-2009, 18:24   #11
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All you guys must be rich if you can afford to scrap a perfectly good engine because of a little water in the engine without determining the extent of the damage. If the cylinders are not pitted they can be honed and rings replaced. If pitted they can be rebored or replaced if they are wet sleeves. Engines are not cheap to replace and it is usually cheaper to overhaul than it is to replace with new
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Old 28-04-2009, 20:18   #12
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Quote:
Originally Posted by perchance View Post
All you guys must be rich if you can afford to scrap a perfectly good engine because of a little water in the engine without determining the extent of the damage. If the cylinders are not pitted they can be honed and rings replaced. If pitted they can be rebored or replaced if they are wet sleeves. Engines are not cheap to replace and it is usually cheaper to overhaul than it is to replace with new

Not by much on a 3GM yanmar if the rebuild is to be done right by a qualified mechanic. If Mike has the ability to do it himself then I'd agree. But just the nature of his question leads me to believe, and I might be wrong, that it might be more than he's willing to undertake.
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Old 02-06-2009, 12:02   #13
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Yanmar Update

I thought I would give an update on this unusual situation.

I tore into the engine. Cylinders looked good. Replaced the rings and bearings, and had a valve job done. Also honed the cylinders. There was water in all three cylinders, but no damage. The engine looks great.

The culprit turned out to be a bad mixing elbow.

I am waiting for one more set of rings to complete the reassembly.

Thanks,

Mike
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Old 02-06-2009, 12:18   #14
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Hey Mike, take a close look at the pistons for small cracks. My 3GM had to have a ring and piston job at less than 2500 hours due to cracks in the lands where the rings seat. Bottom ring if I remember right....
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Old 02-06-2009, 12:25   #15
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Thanks for the heads up - I will check it out.
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