Yanmar while sailing, reverse or neutral? - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


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Old 04-16-2013
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Yanmar while sailing, reverse or neutral?

I always was told, that while sailing, lock the shaft by putting the transmission in reverse. But now I hear that Yanmar has a bulletin out, saying to leave it in neutral, and let it spin. To quote:

"Advisory Number: MSA08-003:

DATE February 8, 2008 Dealers and OEMs
TO: All Marine Distributors
SUBJECT: Gear in Neutral While Sailing All MODELS:

All Sailboat Engines

We continue to get questions regarding the correct gear position while sailing with the engine OFF. This advisory is issued as a reminder; Yanmar requires that if sailing with the engine OFF (not running) the transmission shifter must be in the neutral position or internal damage to the gear or sail-drive will result. This damage will not be covered by Yanmar's Limited Warranty. Please instruct customers and dealers who deliver the sailboat to the customer, of the correct (Neutral) position for the marine gear while sailing.

If the customer desires that the propeller shaft not spin while sailing, either a folding propeller, shaft break, or other suitable device may be used. However, Yanmar accepts no responsibility for the selection, installation, or operation of such devices. Please also refer to Marine service advisory "MSA07-001_Yanmar Sail Drive Propeller Selection" for additional information.

If you have any questions regarding this advisory please contact a Customer Support representative."

True, or internet rumor?
Thanks
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Old 04-16-2013
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Re: Yanmar while sailing, reverse or neutral?

True
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Old 04-16-2013
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Re: Yanmar while sailing, reverse or neutral?

Quote:
Originally Posted by sapo View Post

True, or internet rumor?
Thanks
Definitely true..

Here's a link to the actual MSA..

Yanmar MSA (LINK)
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Old 04-17-2013
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Re: Yanmar while sailing, reverse or neutral?

Thanks. We have a MaxProp, so it should spin pretty slowly . . .
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Old 04-17-2013
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Re: Yanmar while sailing, reverse or neutral?

Can anyone explain why this is so?
To me, it makes no sense.
I would think that a rotating shaft and gearbox would wear out the drive eventually.
I accept that they're right, but why?
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Old 04-17-2013
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Re: Yanmar while sailing, reverse or neutral?

Quote:
Originally Posted by sapo View Post
Thanks. We have a MaxProp, so it should spin pretty slowly . . .
You could put it in reverse momentarily to feather the prop.. then in neutral afterwards and nothing should turn.
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Old 04-17-2013
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Re: Yanmar while sailing, reverse or neutral?

My understanding is that the metallic cone clutches which can bind tightly when sailing in gear, were being damaged by people forcing them into neutral to start. While it does "bother" me a little to hear the gear spinning, I'm getting used to it.
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Old 04-17-2013
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Re: Yanmar while sailing, reverse or neutral?

Is this true for the Kanzaki Hurth Transmissions that use ATF? My understanding was that these transmissions were to remain in reverse while sailing.

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Old 09-05-2013
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Re: Yanmar while sailing, reverse or neutral?

My next question is ... how to best get my 2 blade Martec prop to close and stay closed? SOP for racing is to rotate the prop shaft to the correct the position to close the Martec blades and lock the trans into reverse.

?
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Old 09-05-2013
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Re: Yanmar while sailing, reverse or neutral?

The best solution to this may be some sort of shaft brake that automatically releases when the motor is running and put into gear. I agree that any parts: seals, gears, cutlass bearings, etc. that constantly turn for no good reason will experience wear. That's obvious. There is friction and friction = wear. The engineering of these marine engines IMO is inadequate in this respect. It's like designing a car with no "Park" on an automatic transmission.
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