Join Date: Oct 2010
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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?