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Old 02-05-2012, 17:17   #1
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Yanmar, 2cyl, 18hp, model no.?

Installed in 1979. vertical cyl design. Big square-ish rocker covers. reportedly 18 hp. Anyone know what model number this might be...? Owner knows nuttin' !
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Old 02-05-2012, 17:24   #2
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Re: Yanmar, 2cyl, 18hp, model no.?

And no data plate on it ?????
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Old 02-05-2012, 17:31   #3
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Re: Yanmar, 2cyl, 18hp, model no.?

couldnt find it, but very hard to get back to the port aft corner of the engine. I'll figure it out but just wondered what engines they were selling circa '79.
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Old 02-05-2012, 17:44   #4
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Re: Yanmar, 2cyl, 18hp, model no.?

Raw water cooled or fresh? Probably raw if it's that old.. Lemme see if Boatdiesel will help.
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Old 02-05-2012, 17:49   #5
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Re: Yanmar, 2cyl, 18hp, model no.?

Put a photo up
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Old 02-05-2012, 17:54   #6
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Re: Yanmar, 2cyl, 18hp, model no.?

Are there 2 separate rocker covers, like on some older Volvos?

Could not find any 18hp 2 cyl. Models on Boatdiesel, which probably means the owner knows even less!
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Old 02-05-2012, 17:56   #7
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Re: Yanmar, 2cyl, 18hp, model no.?

Quote:
Originally Posted by Cheechako View Post
Installed in 1979. vertical cyl design. Big square-ish rocker covers. reportedly 18 hp. Anyone know what model number this might be...? Owner knows nuttin' !
If Fresh water cooled, likely a 2GM20F.
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Old 02-05-2012, 18:11   #8
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Re: Yanmar, 2cyl, 18hp, model no.?

Quote:
Originally Posted by svHyLyte View Post
If Fresh water cooled, likely a 2GM20F.
2GM20Fs were not introduced until 1983...

If it is in fact a 1979 motor 20HP it would likely be the 2QM20...Or perhaps a very early model 2GM/2GMF...But those are 13 hp motors.

Pic of a 2QM20...



Might add that the 18 HP may well be referring to the max continuous rating which is a few HP less than rated max (which is why I referred to the 2GMF as a 13HP motor and not the 5 as shown in the Torreson list)
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Old 02-05-2012, 18:15   #9
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Re: Yanmar, 2cyl, 18hp, model no.?

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Originally Posted by svHyLyte View Post
If Fresh water cooled, likely a 2GM20F.
I think the 2GM came later than 1979, also it's rated only 12 hp.. It was fresh water cooled as an option.

I think it's a 2QM15 rated at 15 hp, and started production around 1977. It's a raw water cooled engine.

Or, if there is a chain up front, oriented vertically to allow hand starting, it might be a 2QM20, rated at 20hp.
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Old 02-05-2012, 18:49   #10
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Re: Yanmar, 2cyl, 18hp, model no.?

Quote:
Originally Posted by speedoo View Post
I think the 2GM came later than 1979, also it's rated only 12 hp.. It was fresh water cooled as an option.

I think it's a 2QM15 rated at 15 hp, and started production around 1977. It's a raw water cooled engine.

Or, if there is a chain up front, oriented vertically to allow hand starting, it might be a 2QM20, rated at 20hp.
Hummm... We replaced the engine in our (at the time) 1976 Cal 2-29 with a 2GM20F that was rated at 18 hp continuous/20 hp maximum (at 4000 rpm). I believe we may still have the receipts ($6,500, installed, at the time). Of course there were other models as well. The engine model should be stamped on the side of the block on the starboard side, below the dip-stick.

FWIW...
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Old 02-05-2012, 19:45   #11
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Re: Yanmar, 2cyl, 18hp, model no.?

If its in fact the 2GM20F then the motor is from '83 or later...

At any rate the QMs and the GMs are different enough (as can be seen in the pic above) that it should be a simple matter to sort out.


FWIW...

Date of Production Start
Engine Model
Max. output (DIN6270B) hp/rpm (SHP)
No. of Cyl.- Bore x Stroke mm
Displace-ment
Dry Weight kgs
Remarks
1969
PMX 6
PMX 8 5.5/2300
8.5/2100 1-75 x 80
1-85 x 95 0.353
0.539 146
188 Horizontal type, direct sea-water cooling.
1971
YSE 8
YSE 12 8.0/3200
12.0/3000 1-75 x 75
1-85 x 90 0.331
0.510 131
169 Horizontal type, direct sea-water cooling.
1974
SVE 8
SVE 12 8.0/3200
12.0/3000 1-75 x 75
12.0 x 90 0.331
0.510 140
170 Vertical type, direct sea-water cooling. 2QM20 22.0/2800 2-88 x 90 1.094 218 First QM series
1975
2QM20H (F)
3QM30H (F) 22.0/2800
33.0/2800 2-88 x 90
3-88 x 90 1.094
1.642 190
260 - Developed multi-disc clutch type marine gear KBW series (QMH-series)
- 3QM30H released.
1976
YSB 8
YSB 12 8.0/3200
12.0/3000 1-75 x 75
1-85 x 90 0.331
0.510 111
138 Light-weight version of YSE SB 8
SB 12 8.0/3200
12.0/3000 1-75 x 75
1-85 x 90 0.331
0.510 114
137 Light-weight version of SVE
1977
YSM 8
YSM 12 8.0/3200
12.0/3000 1-75 x 75
1-85 x 90 0.331
0.510 102
130 Modification of fuel injection pump. (Dickel type -> Bosch type) 2QM15 15.0/3000 2-75 x 75 0.662 145 Bottom of the QM range.
1980
1GM
2GM (F)
3GMD (F)
3HM (F) 7.5/3600
15.0/3600
22.5/3600
30.0/3400 1-72 x 72
2-72 x 72
3-72 x 72
3-75 x 85 0.293
0.586
0.879
1.126 70
100 (108)
130 (138)
158 (167) - High speed, Light duty type GM/HM series,
- Developed cone clutch type marine gear KM series & sail-drive SD series.
1982
4JM-TE
4PHE
4PH-TE
6PHE
6PH-TE
6PH-HTE * 50/3600
* 80/2900
* 100/2800
* 120/2900
* 145/2800
* 175/2800 4-78 X 78
4-95 X 110
4-95 X 110
6-95 X 110
6-95 X 110
6-95 X 110 1.490
3.119
3.119
4.678
4.678
4.678 227
360
375
490
510
530 Bob tail spec. series (*Flywheel output)
- Sales area: Scandinavian market only
- Sales area: Taiwan & US market only (PHM series).
1983
1GM10
2GM20 (F)
3GM30 (F)
3HM35 (F) 9.0/3600
18.0/3600
27.0/3600
34.0/3400 1-75 x 72
2-75 x 72
3-75 x 72
3-80 x 85 0.318
0.638
0.954
1.284 76
106 (114)
130 (138)
158 (167) - GM/HM Bore-up series start.
- 20% power-up of GM series & 13% power-up of 3HM.
- Developed V-drive marine gear KMV series (except HM series) 4JH (B) E
4JH-T (B) E 44.0/3600
55.0/3600 4-78 x 86
4-78 x 86 1.644
1.644 226 (228)
232 (234) - 4 cylinder, Direct injection type 4JH series.
- Developed angle drive marine gear (KM4A).
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Old 03-05-2012, 12:00   #12
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Re: Yanmar, 2cyl, 18hp, model no.?

Well Sid, you're absolutely right, our 2GM went in after '83. Brain slip due to advancing age I guess.

FWIW...
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Old 03-05-2012, 12:08   #13
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Re: Yanmar, 2cyl, 18hp, model no.?

I need to get a pic I guess. I could swear it had two sep valve covers like the old volvos..... but that 2QM pic looks pretty close. There may have been a chain up front... seemed to be more covers than I'm used to seeing. It is freshwater cooled, the expansion tank being along on the stbd side and pretty small really. Definitely not a GM series engine... those I recognize... this is visually a heftier block design.
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Old 03-05-2012, 12:25   #14
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Re: Yanmar, 2cyl, 18hp, model no.?

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Originally Posted by svHyLyte View Post
Well Sid, you're absolutely right, our 2GM went in after '83. Brain slip due to advancing age I guess.
I know the late 70s/early 80s are all a blur to me...

Wasn't disputing your motor BTW...Have no doubts you know what you've got.

Was suggesting to the OP to go back and fact check what the owner of that motor is telling him, as it sounds like there is still some confusion on the year and model.

So happens, that as my 83 vintage 2GMF is getting long in the tooth and is too small for the boat anyway, I went looking for options last year and found a never been in a boat before "zero hour" 2GM20F for sale.

As the new Yanmar YM's don't impress me much, and both them and the Betas would require some fairly involved reworking of the engine compartment (Not to mention their price tags ) ...I snapped it up for not a whole lot more than a rebuild of my own motor would have cost.

After some months of delay, I will be getting it put in next week.
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