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Old 23-11-2016, 01:26   #1
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Age of Yanmar 22hp

Hi, I'm trying to find out how old my Yanmar diesel is, it just looks
visually in too good a nick to be the original engine installed when it
was built in 1982. Its a 3GMD Engine No. 04913. Can anyone help
with verification of build year? thanks...
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Old 23-11-2016, 02:35   #2
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Re: Age of Yanmar 22hp

My info suggests your Engine would have been built in the last century [1980].
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Old 23-11-2016, 05:09   #3
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Re: Age of Yanmar 22hp

Our previous vessel was a 1981 Tanzer8.5 which had a 3GM20 auxillary, It still looked very clean when we sold her 3+ years ago. The engine serial number was 000392. Very possible yours was an original.
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Old 23-11-2016, 09:49   #4
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Re: Age of Yanmar 22hp

Quote:
Originally Posted by Crew of Turning View Post
Our previous vessel was a 1981 Tanzer8.5 which had a 3GM20 auxillary, It still looked very clean when we sold her 3+ years ago. The engine serial number was 000392. Very possible yours was an original.
Wow, these engines appear to have serious longevity if their maintained well, I suppose a visually clean engine can say just that, engine hours
are unknown so who knows if its been rebuilt over the years, it sure
sounds sweet when running.
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Old 23-11-2016, 10:16   #5
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Re: Age of Yanmar 22hp

All the 3gm engines were built from 1980-83.

Replaced by the similar but larger displacement 3gm30 in '83.

If you Google "3gmd manual" you may find a free pdf of the service manual. Good to have and will answer many questions as time goes by.
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Old 23-11-2016, 10:18   #6
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Re: Age of Yanmar 22hp

My 85 year boat had a 3QM in it. I've often wondered how the GM and QM overlapped or... what?
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Old 23-11-2016, 10:34   #7
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Re: Age of Yanmar 22hp

I think the qm series precedes the gm series.

I believe they are the lower rpm "stroker" motors.

The pdf attached shows some model ID info.
Attached Files
File Type: pdf tmp_9956-Yanmar-model-ID-1597501768.pdf (18.4 KB, 64 views)
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Old 23-11-2016, 10:42   #8
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Re: Age of Yanmar 22hp

Quote:
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I think the qm series precedes the gm series.

I believe they are the lower rpm "stroker" motors.

The pdf attached shows some model ID info.
Thanks, Yeah some info says the QM were made thru 1980, yet my boat was 1985, and there is a used QM for sale now that is a 1984. Go figure! A lot better engine than the later lightweight high rpm GM. 2800 rpm max vs 3600 rpm. 33 hp vs maybe 25 hp. Just been curious about the discrepancies...
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Old 23-11-2016, 10:46   #9
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Re: Age of Yanmar 22hp

I've got a 2QM20 in mine that's still trucking, built in '78 apparently
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Old 23-11-2016, 11:33   #10
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Re: Age of Yanmar 22hp

The QM yanmar will run a very long time. The older 3GM's (raw water cooled or with add on fresh water cooled have several differences over the later 3gm30F which only came fresh water cooled. The original GM's had sleeved cylinders and have a slightly different size piston compared to the latter "value engineered 3GM30F's

Generally the QM and GM's can last a LONG time with proper care.
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Old 23-11-2016, 15:43   #11
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Re: Age of Yanmar 22hp

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The QM yanmar will run a very long time. The older 3GM's (raw water cooled or with add on fresh water cooled have several differences over the later 3gm30F which only came fresh water cooled. The original GM's had sleeved cylinders and have a slightly different size piston compared to the latter "value engineered 3GM30F's

Generally the QM and GM's can last a LONG time with proper care.
What are you saying there Sailor Chic, that the Sleeve cylinders on the
GMs are a good thing? and the later Models they were cost cutting?
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Old 23-11-2016, 15:48   #12
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Re: Age of Yanmar 22hp

Quote:
Originally Posted by four winds View Post
All the 3gm engines were built from 1980-83.

Replaced by the similar but larger displacement 3gm30 in '83.

If you Google "3gmd manual" you may find a free pdf of the service manual. Good to have and will answer many questions as time goes by.
Thankyou, so my 3GMD is a heavier, lower Revving Unit compared to later
cost cutting Models?
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Old 23-11-2016, 15:51   #13
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Re: Age of Yanmar 22hp

When I bought my Sailboat I immediately had the Yanmar Serviced, Oil, belts & impeller, as I didn't know how long it had been sitting idle for.
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Old 23-11-2016, 16:31   #14
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Re: Age of Yanmar 22hp

Quote:
Originally Posted by Boxertwinjeff View Post
What are you saying there Sailor Chic, that the Sleeve cylinders on the
GMs are a good thing? and the later Models they were cost cutting?

A wet sleeved Diesel you can replace the sleeves with no tools and with new standard size pistons return the cylinders to new condition.
I've done it several times with Backhoes leaving the engine in, as separating the engine from the rest of the Backhoe is a real bear.
A non wet sleeve engine, the block has to come out and go to a machine shop to be bored, and over size pistons installed. Depending on the skill of the machine shop it is often not as good as new, and usually only can be done one or two oversized.
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Old 23-11-2016, 17:03   #15
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Re: Age of Yanmar 22hp

What A64pilot said.

Though it is possible to have the old bores bored out on the newer 3gm30F and have sleeves installed. I did that on the one hole that went bad on Purple, my yanmar a few years ago.

Yanmar saved a few dollars by using a cast block rather then separate sleeves. Having sleeves reduces the amount of disassembly one has to do for an engine rebuild. But costs more to manufacturer.
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