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Old 27-07-2015, 17:27   #1
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opinions on Yanmar 2GM Good Bad?

I'm looking for opinions on Yanmar 2GM motor, dependable, durable, good, bad, poor, any? Thanks
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Old 27-07-2015, 17:57   #2
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Re: opinions on Yanmar 2GM Good Bad?

Well... widely used,, many hours racked up. They have some potential issues but not sure if more than the norm for other engines.
-Piston cracking (maybe just early /mid 90's?)
-Oil feed line external to the engine.
-Coking of the exhaust elbow.
-High cost of spare parts.
-Manufacturer recommends high rpm use. These engines rate their horsepower at that high rpm. So be careful at lower rpms the HP isn't near as much.
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Old 27-07-2015, 18:41   #3
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Re: opinions on Yanmar 2GM Good Bad?

Both of Ours have 5k+ hours and still start right up, parts easy to find. Burn a little oil, easy to work on and maintain. Very fuel efficient.

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Old 27-07-2015, 20:02   #4
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Re: opinions on Yanmar 2GM Good Bad?

I forgot to add: The Yanmar is probably as good as most really.
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Old 28-07-2015, 04:54   #5
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Re: opinions on Yanmar 2GM Good Bad?

Is it a 2GM or 2GM20.

The 2GM must be getting long in the tooth by now and IMHO, not as good as the 2GM20.
Still, they can be a sturdy little engine.

Presumably not a F model so it will be raw water cooled. Check inside the water jacket for excessive corrosion. You see a bit though the anode holes, thermostat hole and temp. switch hole.
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Old 28-07-2015, 11:22   #6
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Re: opinions on Yanmar 2GM Good Bad?

Nice little motor.
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Old 28-07-2015, 15:17   #7
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Re: opinions on Yanmar 2GM Good Bad?

Thank You for the replies. Ok, anyone have pic's of the 2GM?
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Old 29-07-2015, 11:14   #8
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Re: opinions on Yanmar 2GM Good Bad?

Or, if I can't get pic's can some one tell me what the component is that runs off a belt/pulley on the front bottom left of the motor? Thanks
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Old 29-07-2015, 11:19   #9
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Re: opinions on Yanmar 2GM Good Bad?

Come on. You can do this yourself.
http://j30.us/files/yanmar-manual.pdf
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Old 29-07-2015, 12:30   #10
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Re: opinions on Yanmar 2GM Good Bad?

Thanks for the file. I did multiple searches and wound up with nothing useful, could be because of our rural location, cell phone is our Internet. Just buying the boat and looking it over from stem to stern, hasn't been used in 8yrs since the owner passed and is in the possession of the dry dock yard owner for fees owing, title is clear. From the file I discovered that the water pump is missing, it may have been scavenged by dry dock owner/mechanic who works on most of the boats in the harbour. Thanks Again
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Old 29-07-2015, 12:39   #11
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Re: opinions on Yanmar 2GM Good Bad?

8 years is a long time. The engine may be useless at this point. Hard to say. can you turn the drank by hand?
As well as engine... assume you will have fuel tank, propeller shaft issues etc.
That missing water pump may be $300 +/-
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Old 29-07-2015, 17:12   #12
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Re: opinions on Yanmar 2GM Good Bad?

Quote:
Originally Posted by Grungy View Post
Or, if I can't get pic's can some one tell me what the component is that runs off a belt/pulley on the front bottom left of the motor? Thanks
Raw water pump but I note you have worked that out

Here is two photos of a 2GM20. The second one shows the raw water pump.

From the content of your posts, it appears that you might not know yet whether it is a 2GM or 2GM20 and/or if it is freshwater cooled or raw water cooled. The main photo shows my raw water cooled engine; the fresh water one will have an heat exchanger on the top of the engine on the exhaust side (RHS, looking from gearbox end).

If it's a 2GM20, the serial number will help you know what the original raw water pump was fitted. Serial numbers beginning with the letter "E" have a different pump and lower hose than those without a letter. The "E" indicates an engine assembled in Europe. There are certainly some in the USA as well as Australia. The correct parts catalogue for E serial numbers is the 2GM20-YEU or if freshwater cooled, 2GM20F-YEU.

I can find more photos of my pump and bracket if necessary.
Note the exhaust and air cleaner are currently removed in the photo.
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Old 29-07-2015, 20:23   #13
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Re: opinions on Yanmar 2GM Good Bad?

It's a 2GM with the manual crank extension off the main pulley. There is a belt on the small pulley but no pump, I'll have to inquire about it's where-abouts. Thanks for the pic's. An acquaintance recently fired up his diesel after an eight year shut down, throttle stuck wide-open, but it ran. There's still hope. Thanks Again.
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