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Old 20-04-2011, 16:04   #1
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Maximum Engine Angle

I've decided to re-power our Bayfield 32. Old engine was a Yanmar 2QM15. It's already out and sold! For the new engine I'm considering either a Yanmar 2YM20 or a Beta Marine 20 (BD722). I'm doing the refit/installation myself.
I've had lots of recommendations for the Yanmar and everything else being equal, that's how I'd go but for one issue. The problem is that the Bayfield 32 has a 15 degree angle on the prop shaft and that is right on the edge of the recommended static installation angle for either engine. Beta offers a 7 degree down angle transmission which is pushing me in that direction (Beta). My question is should I even be concerned about the 15 angle or would I really be better off with the Beta and the 7 degree down angle transmission?
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Old 20-04-2011, 17:22   #2
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Re: Maximum engine angle?

What was the recommended static installation angle of the old 2QM15? if is was 15 or less AND did not have any problems then is unlikely that it would be a problem for the 2YM20.

Have you asked Yanmar?
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Old 20-04-2011, 17:46   #3
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Re: Maximum engine angle?

Have you considered a V-Drive transmission?
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Old 20-04-2011, 17:58   #4
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Re: Maximum engine angle?

I repowered with a four cylinder Yanmar mated to an 8 degree down Kazaki transmission - perhaps the smaller Yanmars have those options as well?

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Old 20-04-2011, 18:11   #5
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Re: Maximum engine angle?

I'm not sure if you mean 3YM20 or 2YM15. For the 3YM20, the recommended engine installation rake is 8 deg but the maximum allowable is 15 deg. The peak allowable angle is 25 deg. If your boat pitches more than +/- 10 degrees when under way, the Yanmar may not be for you. Otherwise, 15 degrees is within the allowablerange and you should be fully covered by the warranty.
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Old 20-04-2011, 18:44   #6
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Re: Maximum engine angle?

Check with the engine manufacturer.

The John Deere 4045D marine diesel engine has a maximum angle of 12 degreese front up and 0 degrees front down. Undoubtedly these angles will vary with the manufacturer/model.
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Old 20-04-2011, 20:50   #7
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Re: Maximum engine angle?

I have considered a V-drive but I really don't have the room. I'd lose too much cabinet space (above the engine) that I can't afford to lose.
Ziggy- You are correct. I meant the 3YM20. I'm not sure if there is a down angle transmission available for the 3YM20. If there is, that would solve everything. Otherwise I'll probably go with the Beta. I understand the Beta (Kabota) to be a very good engine with some nice features. My only concern is parts availability and local support. Maybe I'm making too much of that.
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