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Old 27-02-2021, 12:39   #1
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Yanmar Leaking

Hello all,

New sailboat owner here. I noticed any time I turn on the Yan Marr 9 hp diesel engine, there is water spraying out of the back. I tried to film and see where the waters coming from. Anyone have any experience with this or can point me in the right direction? Any help appreciated.


https://youtu.be/5AjfOphIqJA
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Old 27-02-2021, 13:00   #2
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Re: Yanmar Leaking

As I recall, there is a water jacket drain plug in that area. It either rotted out, or fell out.
I think it's a 1/4" pipe plug. Joe D
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Old 27-02-2021, 14:03   #3
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Re: Yanmar Leaking

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As I recall, there is a water jacket drain plug in that area. It either rotted out, or fell out.
I think it's a 1/4" pipe plug. Joe D

Thank you. I will look for this!
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Old 27-02-2021, 16:20   #4
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Re: Yanmar Leaking

There is also a zinc anode plug in this area (block anode).
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Old 07-03-2021, 14:44   #5
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Re: Yanmar Leaking

So still stuck on this. There is an opening from which air and water are spewing out. The opening is covered by a thing metallic cover about the size of a half dollar. It is in a very difficult to access area on the rear of the engine. The cover moves open/closed very easily with my finger, but I cannot remove it.

I need someone to point me in the right direction. All of the diagrams I find online do not list this part/area.
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Old 07-03-2021, 15:23   #6
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Re: Yanmar Leaking

I have the Yanmar workshop manual here. Send your regular email address and I will send a picture of the workshop page. Do you have a model 1GM or a 1GM10? Joe D
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Old 07-03-2021, 15:50   #7
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Re: Yanmar Leaking

See location of anode on rear of engine per shop manual
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Old 07-03-2021, 16:25   #8
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Re: Yanmar Leaking

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See location of anode on rear of engine per shop manual
It seems to be just below this. Iíve tried taking a better video but I canít seem to get it. Iíve marked the area in red.
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Old 07-03-2021, 16:30   #9
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Re: Yanmar Leaking

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It seems to be just below this. Iíve tried taking a better video but I canít seem to get it. Iíve marked the area in red.
Get a mirror and take a picture of the place the water is coming out. The engine doesn't have to be running to take the pic, just have good lighting on the location.

I'm thinking it's a rotted core plug leaking. That's the only thing I can think of that would be in the red marked location.
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Old 07-03-2021, 17:54   #10
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Re: Yanmar Leaking

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Get a mirror and take a picture of the place the water is coming out. The engine doesn't have to be running to take the pic, just have good lighting on the location.

I'm thinking it's a rotted core plug leaking. That's the only thing I can think of that would be in the red marked location.
I canít take a picture right now, but yes, after googling it, it seems like it is a core plug! Is this something I can fix myself, or do I need an actual diesel mechanic?
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Old 07-03-2021, 17:54   #11
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Re: Yanmar Leaking

Hi
Looks like it might be on the gasket line for the head gasket from what I can see. If it is, then you will need to remove the cylinder head and find out why.
Just some good still photos would help.
Cheers
Tom
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Old 07-03-2021, 18:42   #12
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Re: Yanmar Leaking

johnmc618, you be able to see better if you remove the air filter (and housing) and perhaps the fuel filter.

This engine has a 'freeze' plug or cup at the rear of the block and this might have let go if the engine has been subjected to freezing temperature (without having taken the necessary freezing precautions).
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Old 08-03-2021, 05:47   #13
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Re: Yanmar Leaking

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johnmc618, you be able to see better if you remove the air filter (and housing) and perhaps the fuel filter.

This engine has a 'freeze' plug or cup at the rear of the block and this might have let go if the engine has been subjected to freezing temperature (without having taken the necessary freezing precautions).
Iím thinking this must be it. Unfortunately work is going to keep me away from the boat for a few weeks. But I live here in Texas where we just had freezing temps for several days, so this must be it.

Thank you all! Iíll report back.
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