Yanmar 2GM20 steam through the Exhaust - SailNet Community
 
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post #1 of 8 Old 06-06-2012 Thread Starter
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Yanmar 2GM20 steam through the Exhaust

Help.
I have a Yanmar 2GM20 that when not in gear and high revs the exhaust is normal. As soon as the gear engages steam comes out of the exhaust.
I have checked the water pump and engine for blockages, there are none.
Has anybody got any ideas...??
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post #2 of 8 Old 06-06-2012
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Yanmar 2GM20 steam through the Exhaust

Steam in the exhaust indicates water or coolant from the cooling passages is getting into the combustion chambers

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post #3 of 8 Old 06-06-2012
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Re: Yanmar 2GM20 steam through the Exhaust

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Steam in the exhaust indicates water or coolant from the cooling passages is getting into the combustion chambers
If you're lucky, it's just a leaking head gasket. Try torquing your head bolts back down to see if that solves the issue. Hopefully, it will.

If not, then you need to rule out the other possibilities (e.g., warped head, cracked head, cracked block, etc.)
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Re: Yanmar 2GM20 steam through the Exhaust

Is it steam or white smoke?.. There is a difference. Steam indicates overly warm raw water, actual white smoke is usually coolant being burned. Is your mixing elbow in good shape?

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post #5 of 8 Old 06-07-2012
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Re: Yanmar 2GM20 steam through the Exhaust

Look at your oil and coolant for contamination, water in the oil or oil in your coolant and you've got a problem.

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post #6 of 8 Old 06-08-2012 Thread Starter
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Re: Yanmar 2GM20 steam through the Exhaust

Thanks for the advice. I tried torqueing the cylinder head bolts and they were tight so I took off the head to have it tested. The head and gasket looked ok to me, although I don't really know what I'm lookig for. I also took out the injectors and injector pump to have them tested. Hope i've covered averything.
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post #7 of 8 Old 06-09-2012
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Re: Yanmar 2GM20 steam through the Exhaust

Recently had the same problem after fitting a new replacement impeller in the cooling water pump. Spitting water but lots of steam. Put back the old one and everything back to normal. Maybe yours is worn.
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post #8 of 8 Old 06-09-2012
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Re: Yanmar 2GM20 steam through the Exhaust

Could be an almost clogged water injector in the mixing elbow -- there isn't enough water flowing through the system to keep the elbow cool, hence the steam. Take the mixing elbow off and see how much crap has built up inside. Also, try blowing into the nipple where the water hose connects to the elbow; if you get any back pressure then it's probably time for a new elbow.

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