Yanmar 2GM Winterization System Failure - SailNet Community

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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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Old 09-04-2012
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Yanmar 2GM Winterization System Failure

I was out putting around last weekend for a few hours. I heard a bang while I was in the head, but did not think much of it, since there were plenty of others aboard that could make such a sound. We were really moving slow like 1000 rpm.

When entering the harbor the engine was pushed to about 2000rmps. The engine seemed a little down on power. After a minute or two I noticed a hollow sound coming from the muffler canister, and then a farting rather than splashing from the stern. I looked down and of course there was no water coming out. We were in a busy channel so we reduced rpms and got out of the way (maybe another minute or two).

I went below to take a look at the engine and water was spraying out of the water hose that connects the thermostat to the mixing elbow. The previous owner had rigged up a winterization system with a lot of extra fittings and hose. I didnít even use it for the single winterization I have done, and it was on my to do list to remove all of it. On this particular hose there was a brazed copper elbow, which cracked right at the corner. I shut down the engine, dried the fitting, liberally applied duct tape, and moved slowly the next 5 minutes to my slip. When I returned to the slip I placed my hand around the engine and did not feel any hot spots

I have spent the last year doing a lot of projects on the boat, but this is the first failure that could have been particularly damaging, or even dangerous.

I have a few questions:
Is it likely that I caused any damage to my engine? What items require close inspection? Can I use any marine water hose, or is it best to replace with the molded (I would guess) yanmar part?

Al Woods
Al Woods
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Old 09-04-2012
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Yanmar 2GM Winterization System Failure

Assuming your temp alarm works and you did not run the engine hard after it went off for very long u r fine. I'd think any hose would do.
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Old 09-06-2012
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Re: Yanmar 2GM Winterization System Failure

Thanks for the reassurance.
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Old 09-06-2012
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Re: Yanmar 2GM Winterization System Failure

The exhaust will have gotten very hot, but the motor will not have been starved of coolant as the water pump was still circulating as normal.
Your engine room will have still gotten its share of salt water spray.
Just check the exhaust for having been cooked.
Avoid copper in the presence of salt water.
Try to use bronze and cast iron.
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