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Old 10-03-2013, 17:09   #1
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Yanmar 2GM Vibration

I have a Yanmar 2GM raw water cooled that seems vibrate more than it should. At one speed it becomes quite excessive which is then transmitted to the boat? All the engine mounts look ok. Should I consider stiffer mounts or is the something wrong with the engine. She starts well and runs well. It is an old engine the 13 hp version
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Old 10-03-2013, 17:48   #2
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Re: Yanmar 2GM Vibration

Two cylinder diesels are known for their basic vibration. My guess is that you have 1 or more engine mounts that are bad. Have someone start it cold while you watch it. It may give you an indication that the mounts are bad.

I'm sure you'll get some suggestions as to how to check the motor mounts.
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Old 10-03-2013, 17:54   #3
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Check your cutlass bearing and your alinement. Also make sure your prop is clean. I have this engine too. I had a similar problem. I check mounts and they looked fine, but after changing the cutlass and having the prop balanced was better but not right. I changed out the mounts and alined the engine and now still have some cubs but after all it is a 2 cylinder
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Old 10-03-2013, 17:55   #4
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Re: Yanmar 2GM Vibration

This is mine when I winterized it. Does yours sound worse than this?

Winterize Yanmar 2GM - YouTube
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Old 10-03-2013, 18:05   #5
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Yep sounds like mine!
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Old 10-03-2013, 18:57   #6
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Re: Yanmar 2GM Vibration

Sounds perfectly normal to me.

David
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Old 13-03-2013, 20:45   #7
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Thaks to you all. I am working through your suggestions. After i cut a large hole in my cockpit sole i discovered the alignment was out. 90 thou on a 4"coupling. The best I could cut down to was 30 thou. I think my strut got bent when I hit a 40 ft by 2ft diam log a few years back. It didnt become noticeable until i replaced the stuffing box with a PYI dripless unit which has no lateral stability. The 90 thou run out on the coupling translates to the strut being bent 0.4". Being cast bronze anyone know if this can be safely bent back with lots of heat.
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