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Post by rwenergy on Jun 25, 2019 15:06:43 GMT
Should we run prop in neutral or reverse with Yanmar 4jh4ae on Jeanneau 42 DS when under sail and engine off?
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Post by Tafika II on Jun 25, 2019 15:44:07 GMT
We have a Flex-O-Fold and leave the transmission in reverse when sailing. 2008 SO42DS
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Post by zaphod on Jun 25, 2019 16:00:30 GMT
We have a Flex-O-Fold and leave the transmission in reverse when sailing. 2008 SO42DS Why do you feel the need to put it in gear with a folding prop? |
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Post by Zanshin on Jun 25, 2019 23:20:58 GMT
The engine isn't relevant to the question of whether or not to leave the propeller in gear, it is the transmission that decides the correct course of action. Generally Yanmar states that the gear must be in neutral while sailing, there is an advisory (from 2008) number MSA08-003 to this effect. There's also another old thread here - jeanneau.proboards.com/thread/2196 A folding or feathering prop is somewhat different, as it needs some resistance to change angle. I have a folding prop so keep the engine in gear while sailing so that the prop gets a chance to fold and doesn't freewheel. A standard prop on a Yanmar engine with a Kanzaki transmission should be in neutral. |
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Post by Syrah on Jun 26, 2019 4:40:33 GMT
To get the folding prop on our 42ds to fold, I put the selector in reverse as soon as I cut the engine. To ensure that I don’t start the engine while it is still in reverse, I put it back to neutral after a couple of minutes.
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Post by Madicken on Jun 26, 2019 17:16:58 GMT
I have the sail-drive sd50. Whit a Gori folding prop. I have now run it for 515 hours. I normally run it in between 1900 and 2200 rpm. and i ALWAYS put it in revers when I sail. Yet I have never had any problems at all (so far)
Regards
Olof "Madicken och Sweden"
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Post by Zanshin on Jun 26, 2019 22:50:46 GMT
The state of the gear lever and the possible damage to the transmission is only applicable when you have a fixed propeller. The folding and turning types - Gori, Flex-o-fold, Variprop, etc. are designed to put no load on the shaft once in their "rest" and low-drag configuration.
With a fixed prop and the incorrect gear selection there is a chance of damage to the transmission - hence the Yanmar advisory.
I have a folding prop, so I make sure to keep the gear in after turning off the engine to force the prop to fold, then I put it back into neutral so that I don't have to worry about the selector when I turn the engine back on.
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Post by moonshadow on Jun 27, 2019 12:11:21 GMT
I have a SD60 saildrive and Yanmar 4JH5E engine and a flex fold prop . Thanks manual says to sail with engine in neutral. I can hear my prop shaft spinning when I put it in neutral to cool, then shut it down. I will then put it in reverse for a few seconds and the prop folds, spinning stops. Then I sail in neutral since the manual suggests that. I don’t have any idea if leaving it in gear with a folded prop would hurt anything.
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Post by Bora on Jun 27, 2019 12:46:27 GMT
SD60 Sail Drive
"When the boat sails with engine is off, the shift position of the sail drive can be:
In neutral position and in this case the propeller is free to rotate.
In reverse position:
To lock the fixed propeller
To fold the folding propeller
To feather the feathering propeller"
"Caution!
Do not put the shifting lever of the sail drive in forward position, otherwise the sail drive could be damaged!"
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Post by jdl01 on Jun 28, 2019 18:08:15 GMT
We had a talk from the regional yanmar rep last season. He recommended that in both cone and dog clutch applications with folding or feathering props, when the engine is turned off and the boat is underway, the transmission be put in reverse to ensure the prop folds or feathers, and then the transmission be put back in neutral for the duration. This was in response to a query about premature wear on cone clutches. A feathering or folding prop will not necessarily fully close with the passing water pressure unless it faces momentary rotation resistance - created by putting the clutch in reverse. Once closed, it will stay there without further resistance required.
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Post by joconnor on Jun 29, 2019 12:30:34 GMT
We changed to a maxprop feathering prop and were advised to feather the prop at speeds up to 5 knots, we slow the boat to do this when needed .
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Post by Mistroma on Jul 6, 2019 20:08:11 GMT
Should we run prop in neutral or reverse with Yanmar 4jh4ae on Jeanneau 42 DS when under sail and engine off? My 2009 42DS with 4JH4AE and standard 3 bladed propeller has a yellow sticker beside the gear/throttle lever. It is along the following lines: "If this boat is fitted with a fixed blade propeller then neutral must be selected when sailing at 8 knots or more."I don't sail at 8 knots every day but always put the lever to neutral before stopping the engine. I must admit to forgetting once or twice when wind picked up after motor-sailing. However, speed wasn't near 8kts and I spotted it quickly. |
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Post by ianpowolny on Jul 8, 2019 22:25:05 GMT
We have a Flex-O-Fold and leave the transmission in reverse when sailing. 2008 SO42DS Why do you feel the need to put it in gear with a folding prop? We put ours in to reverse for 30 seconds or so to ensure the prop feathers. Then in to neutral In readiness for the next engine start. |
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