Newer Yanmars including mine use Tuff Torq transmissions. Go to their website and click CONTACT, it goes to Yanmar.jp. So it looks like Yanmar owns the Tuff Torq manufactiruring company.
prop spins even when engine is off and in gear
- Thread starter JensJaunt
- Start date
Richard's right.
Do a search here or on any other boating forum for 'transmission position" and you'll find this recurring question answered.
Over & over again.
Engine manufacturers do NOT make transmissions. Whether or not they own the companies that do is immaterial.
Period.
Jens,
Don't ya think that mentioning a "V"-drive up-front might add to the total picture here?
If feeling a prop spin while at idle when tied up, this may be pretty much normal.
Torque by itself can cause this.
Contact the tranny manuf. & see what they say pal.........
Maybe this thread can be shortened.
CR
Don't ya think that mentioning a "V"-drive up-front might add to the total picture here?
If feeling a prop spin while at idle when tied up, this may be pretty much normal.
Torque by itself can cause this.
Contact the tranny manuf. & see what they say pal.........
Maybe this thread can be shortened.
CR
Hi Stu, you are correct the question about Yanmar requiring the transmission be in neutral while sailing. I do keep it in neutral when sailing. My question was not related to that. It was about the prop being able to spin with the engine off and the transmission in gear, which I only found out when I had to remove a sheet that got wrapped around the prop That just did not seem and I was worried that the transmission got damaged during.
Sorry Captnron I appreciate all of the help... I did not think that mentioning the VDrive would have shortened the thread. I don't know much about these types of things but I am learning from the collective knowledge in this forum. I will contact the manufacturer of the transmission and ask them. I just have to figure out who the manufacturer of the transmission is, there are no manufacturer details on it and PO did not know.
Coupla' notes, JensJaunt.. IF the transmission nameplate says to use engine oil in it, it probably has cone clutches and when in "forward" the prop and shaft can be turned forward, but not reverse.. when in "reverse" the shaft/prop can be turned in reverse, but not in forward.. The engine rotation drives the clutches into full engagement so with engine not running, the clutches can usually be slowly slipped by hand. IF the transmission nameplate calls for ATF (auto Trans Fluid) instead of engine oil, the shaft can be more easily turned in either direction by hand, but there will be some drag that can be felt.. On these transmissions, the clutch plates are driven into engagement by balls on ramps that jam the clutch plates together only when the engine is running.
Having spent countless hours researching forums on whether to keep transmission (on Yanmar engines) in neutral or reverse, I have not read one post from anyone having to rebuild their tranny because they sailed with it locked in reverse. The biggest problem seems to be the inability to go back to neutral before starting. Most, like myself, just restart in reverse then shift to neutral and then forward. I know this is not ideal but better than trying to force it out of reverse. I'm beginning to wonder if the directive from Yanmar to freewheel is nothing more than a case of CYA. My question then goes out. Has anyone ever had to rebuild a transmission because of locking in reverse while sailing?
Roland
s/v Fraulein II
Roland
s/v Fraulein II
My opinion too, Roland.. I sailed with mine locked in reverse for many years before being enlightened by Yanmar's bulletin.. It may be that a change in cone clutch material has made 'em more likely to fret and/or stick together.. I dunno.. I suspect. as you say, that it has to do with replacing transmission cables that were used to force the neutral.. another likely reason is that with a neutral safety switch, (as on most newer boats) you'd not be able to start in reverse first, then shift to neutral.
On the other hand, with no drive load on the propeller, the shaft is in tension and not causing any significant wear on the Cutless (if you pull tension on a coat hanger wire, it stays straiht; if ya push on it, it needs support to stay straight); no load on the slowly turning transmission would not cause any significant wear( so long as the oil level is correct). the packing is probably getting a bit more wear, but if adjusted to drip a little while the prop freewheels, not much wear there either..
On the other hand, with no drive load on the propeller, the shaft is in tension and not causing any significant wear on the Cutless (if you pull tension on a coat hanger wire, it stays straiht; if ya push on it, it needs support to stay straight); no load on the slowly turning transmission would not cause any significant wear( so long as the oil level is correct). the packing is probably getting a bit more wear, but if adjusted to drip a little while the prop freewheels, not much wear there either..