1983 Yanmar 3GMD REPLACEMENT - SailNet Community
 
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post #1 of 7 Old 04-26-2015 Thread Starter
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1983 Yanmar 3GMD REPLACEMENT

The block is rusted and possibly cracked and motor oil is slowly oozing out on the side of the block but not squirting out. Raw cooling and straight shaft. Engine still starts but I cannot think of a repair option. My question is can I find a reliable used engine, or should I order a new one and then hire someone to do the installation. Hoping to find the cheapest way to do it but I want to do it right. I am told to stick with a Yanmar replacement. I was also told by a shop that the new Yanmar comes with a new transmission. Others suggested to use a beta engine. I am looking for suggestion on how to proceed and and any suppliers of used or new engines. The boat is located in Richmond ca
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post #2 of 7 Old 04-30-2015
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Re: 1983 Yanmar 3GMD REPLACEMENT

If you can afford it, check if the later 3 cylinder 20HP Yanmar (3YM20) will fit on to the same mounts and line up with your shaft.
Expensive, but compared with the old GM series, these are beautiful motors. They are fresh water cooled so other than cleaning the heat exchanger occasionally, there should be no more corrosion worries. Cold starting is far better.
I had one in my last boat and going back to a 2 cylinder GM20 in my present boat really showed how crude the older engines are. At least they are reliable but the salt water cooling system does require diligent attention to anodes etc.
Otherwise, if on a budget, maybe find a GM that is not too flogged out and overhaul it.
Replacing with another brand is always a hassle, as nothing lines up, so the labor cost to do that would be better spent on the engine itself.

Last edited by arvicola-amphibius; 04-30-2015 at 06:34 PM.
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post #3 of 7 Old 04-30-2015
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Re: 1983 Yanmar 3GMD REPLACEMENT

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The block is rusted and possibly cracked and motor oil is slowly oozing out on the side of the block but not squirting out. Raw cooling and straight shaft. Engine still starts but I cannot think of a repair option. My question is can I find a reliable used engine, or should I order a new one and then hire someone to do the installation. Hoping to find the cheapest way to do it but I want to do it right. I am told to stick with a Yanmar replacement. I was also told by a shop that the new Yanmar comes with a new transmission. Others suggested to use a beta engine. I am looking for suggestion on how to proceed and and any suppliers of used or new engines. The boat is located in Richmond ca

It sounds like this didn't happen yesterday and you've run it successfully in this condition..... Have you considered a liberal application of JB Weld to the cracked areas? Might buy you a season or three more. You risk very little by trying it, and at the very least it might allow you to haul and replace things in the winter instead of during sailing season.

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Re: 1983 Yanmar 3GMD REPLACEMENT

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The block is rusted and possibly cracked and motor oil is slowly oozing out on the side of the block but not squirting out. Raw cooling and straight shaft. Engine still starts but I cannot think of a repair option. My question is can I find a reliable used engine, or should I order a new one and then hire someone to do the installation. Hoping to find the cheapest way to do it but I want to do it right. I am told to stick with a Yanmar replacement. I was also told by a shop that the new Yanmar comes with a new transmission. Others suggested to use a beta engine. I am looking for suggestion on how to proceed and and any suppliers of used or new engines. The boat is located in Richmond ca
Any suggestions where to get a used engine? On a new installation what what would be an average installation time?
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Re: 1983 Yanmar 3GMD REPLACEMENT

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Any suggestions where to get a used engine? On a new installation what what would be an average installation time?
I could use the names of reputable diesel mechanics near Anacortes wa or even in the Gulf islands and where to order the engine
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post #6 of 7 Old 05-03-2015
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Re: 1983 Yanmar 3GMD REPLACEMENT

I wouldn't patch up something in this condition buy you're not me. I also wouldn't use a motor of unknown condition and any used motor is of unknown condition. A warranty is only good if the guy you're dealing with is right in your Marina anything other than that will be nothing but problems. Just ask Med or better yet if you have a couple of days read his thread on his motor fiasco.
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Re: 1983 Yanmar 3GMD REPLACEMENT

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I could use the names of reputable diesel mechanics near Anacortes wa or even in the Gulf islands and where to order the engine
Cap Sante boat yard installed my engine and I'm 100% happy with them.

Gregg's marine diesel (Wayne Gregg) is a good and honest mechanic. Doesn't have a yard but he can work in others yards to install your motor.

I know someone else that is having a new motor put in at Emerald Marine, which is a wooden boat specialty yard, and in this case his boat is fiberglass. Andy runs Emerald and he's a 100% stand up guy.

Pacific marine is a great yard, and very good with the engines and drive trains. They're the least expensive yard but they're generally a power boat yard and they may not want to install a sailboat engine.

I wouldn't let North Harbor Diesel touch my boat again, same with North Island Boat.

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beta marine , diesel engine , diesel engine repacment , yanmar 3gmd

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