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Old 23-02-2019, 09:52   #1
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Yanmar 3GM in E27?

I have a Yanmar 3GM that is in excellent running condition. I'm considering installing it in my Ericson 27. It does seem a little large. I don't want to cut the factory stringers or any existing bulkheads. Anyone out there have any experience with this type of install? Any construction advice will be much appreciated. Thanks!
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Old 23-02-2019, 10:55   #2
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Re: Yanmar 3GM in E27?

It's too big. You might be able to shoehorn it in there, but future owners will hate you for it. Too much weight, poor access, etc. Sell the engine and buy a smaller one (or sell the boat and buy a larger one ).
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Old 23-02-2019, 11:46   #3
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Re: Yanmar 3GM in E27?

I put a Universal M25XP 23hp in my Cape Dory 28 sailboat with a three blade propeller and it worked out great, better access than the Volvo I removed and a boat that will actually do hull speed and back down when I want. If you already have it why not? I had to modify the engine beds a little and reroute the exhaust but nothing overly complicated. I should point out I've done numerous repowers before on power and sail.
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Old 23-02-2019, 12:46   #4
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Re: Yanmar 3GM in E27?

I wouldn't do it.

I had a 1gm in an Albin Vega 27; it was slightly underpowered, but not by much. She would do abou 5 knots in calm seas.

My current catamaran (prout snowgoose 37) has a single 3gm - center mount between the hulls. It pushes the boat beautifully, about 6.5 knots in calm seas.

Fitting an engine in that is way too big will shorten the engine life as you just won't be able to work it properly. Diesels like being run at 70-80% load for long life, less load can prematurely wear them out. It also will be harder to service due to the size, and burn more fuel.

As said by others, I'd recommend selling your GM and fit a 15ish horse diesel (20 max). More hp here won't be beneficial at all, just dig a bigger hole in the water and burn more fuel.

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Old 23-02-2019, 13:00   #5
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Re: Yanmar 3GM in E27?

The aft mount width could be an issue. The 3GM30 had to moved forward to replace an A4 in my Pearso 35. Definitely way more hp than you’ll need. The 3GM was the perfect engine for the 13,000# P35 and the 2GM works great in my Sabre 28.
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Old 23-02-2019, 13:14   #6
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Re: Yanmar 3GM in E27?

Assuming an Ericson 27 at 7000 lbs. and a 3GM at 75% load 18hp that's about 400 lbs. per hp which hardly seems overpowered to me. Better to run an engine at 75-80% load than have at 100% in calm water. We all know sailboats motor way more than we admit. Another issue is what can he sell it for and what will it cost for an "appropriate" engine, sometimes a bird in the hand is cheaper than buying a brand new engine. That's why I have the engine I have in my boat, sell it for 2500-3000 dollars and get ripped off on a new engine for ten or twelve grand? No thanks, some people are made of money others make do with what they have.
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Old 23-02-2019, 15:57   #7
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Re: Yanmar 3GM in E27?

Thanks everyone!

I'm going to hold off and see if I can't find a 2GM or 2YM to put in. I talked to the guys at BetaMarine about their A4 replacement. That motor would be ideal, but, at around $9,000 new, it's out of my price range.

In the meantime, I've got a nice running, complete 3GM with transmission for sale!

Thanks again!
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Old 23-02-2019, 19:00   #8
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Re: Yanmar 3GM in E27?

A 3GM is a pretty light and compact little motor and you would really appreciate having the extra power pushing against a head wind and current.
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Old 24-02-2019, 08:38   #9
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Re: Yanmar 3GM in E27?

Keep it! USE it! The 3GM is a nice compact little motor that doesn't take up that much space and packs nice smooth power. I repowered my 30 footer because of the frightening lack of power that the 2GM developed. The two engines share many internal parts, so basically it was the same engine only with an extra cylinder, and I have never regretted the swap!
I admit I am not familiar with the Ericson 27, but surely it can be modified to accept the little 3GM.
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Old 24-02-2019, 10:20   #10
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Re: Yanmar 3GM in E27?

Brad, yes its a lot of power but you have a 7k boat and a good motor. You are not going to spend 12k + installing a new Beta and then having a 9k boat at the end of the day. Measure everything 2x, if your 3 gm + transmission will fit, if you have room to service engine, if its possible, just do it. You will end up with a 8.5k boat but only invest 3k in the repower. Just think what a cool looper it would make.
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Old 24-02-2019, 10:46   #11
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Re: Yanmar 3GM in E27?

I have a 3gm and it’s a great engine... also tempted to say run what you brung, but you might want to start a new thread asking if anyone local would be looking to swap their 2gm for your 3gm.
There are probably some people out there with boats that are slightly under powered that would jump at the opportunity - just my opinion.
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Old 24-02-2019, 12:18   #12
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Re: Yanmar 3GM in E27?

I have a 2GM for sale, just did a valve job on it. Machine shop thoroughly cleaned all passages and surfaced the head, new exhaust valves.
It's sitting in my shop. I put a larger engine in my boat.
PM me if your interested.
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