prop spins

[Hawnfisherman]

I own twin 115s, F115XB and LF115XB, the counter rotating engine prop spins when it is in neutral, the dealer that installed it said that that is normal. I was wondering if this is normal or is there a way to stop it from spinning, like an adjustment or something that needs to be done.

[dngharvey]

Sometimes they will spin but very slowly, check again when warm if you have that capability. Think the shaft is turning all the time but not real solid till gears are engaged.

[pstephens46]

Are you noticing this out of water running on hose or muffs?
Spinning very slowly? That is normal. Gear friction on propshaft.

[boscoe99]

Completely normal. Some propellers will turn fairly quickly if and when the motor is being run on flush muffs. My Yam F200 propeller turned quickly. Fast enough that I did not dare try and stop it. But if the propeller were prevented from turning before the motor was started (say it was held by a stick) then it would not turn.

The gear oil is being rotated by the gears spinning within the gear case. The turning oil then acts on the propeller shaft to turn it. The propeller being attached to the propeller shaft is going to turn. Sort of like what happens in an automatic transmission.

[pstephens46]

If you are not familiar with the innards of the lower unit, take a look at this video.

https://m.youtube.com/watch?v=hYPuB9nmS8E

[robert graham]

Completely normal. Some propellers will turn fairly quickly if and when the motor is being run on flush muffs. My Yam F200 propeller turned quickly. Fast enough that I did not dare try and stop it. But if the propeller were prevented from turning before the motor was started (say it was held by a stick) then it would not turn.

The gear oil is being rotated by the gears spinning within the gear case. The turning oil then acts on the propeller shaft to turn it. The propeller being attached to the propeller shaft is going to turn. Sort of like what happens in an automatic transmission.

Sorta like the old Buick Dynaflo "fluid drive" transmission in our '49 Buick

[99yam40]

I believe Bosco was referring to the torque converter on automatic transmissions.
that is the device that transfers rotating energy thru fluid /oil

but that does lock in mechanically once up to speed

[panasonic]

I believe Bosco was referring to the torque converter on automatic transmissions.
that is the device that transfers rotating energy thru fluid /oil

but that does lock in mechanically once up to speed

Yes it does through the lock up clutch in the torque converter, once it reaches a certain rpm.


https://youtu.be/z5G2zQ_3xTc

[panasonic]

Yes it does through the lock up clutch in the torque converter, once it reaches a certain rpm.


https://youtu.be/z5G2zQ_3xTc

If equipped with a lock up clutch, most modern cars have one...

No to sure of boscoes 49 Buick had one though, but I bet he will soon answer that.

[boscoe99]

If equipped with a lock up clutch, most modern cars have one...

No to sure of boscoes 49 Buick had one though, but I bet he will soon answer that.

It was a 48 Plymouth. With a manual clutch.

Wish I had that car.

[robert graham]

Yep, wish I had that 1949 Buick convertible now....sky blue, black canvas top, blue leather seats....and power windows!....man, what a sweet ride!...

[DennisG01]

A couple years ago, I asked the same thing on this forum. This is the first engine that I have had where the prop spins VERY quickly in neutral (I'm used to seeing some spinning). But mine spins so fast it looks like it is actually in gear. However, I can physically stop it.

But I asked the same question you are and got the same responses. Very normal. The super fast spinning in neutral apparently isn't as common, though.

Sorry for getting off topic - I realize this thread is more about cars and TC's...

[panasonic]

A couple years ago, I asked the same thing on this forum. This is the first engine that I have had where the prop spins VERY quickly in neutral (I'm used to seeing some spinning). But mine spins so fast it looks like it is actually in gear. However, I can physically stop it.

But I asked the same question you are and got the same responses. Very normal. The super fast spinning in neutral apparently isn't as common, though.

Sorry for getting off topic - I realize this thread is more about cars and TC's...

Dog clutches just barely touching each other maybe causing it to spin prop faster than normal when in neutral? Seems strange to spin so fast without any mechanical connection....

Was LU ever taken apart for repairs in the past?

[FabricGATOR]

With engine off and in neutral, do you hear feel and clicking when you spin the prop by hand?

[Hawnfisherman]

Hawnfisherman

I would like to thank everyone for replying to my question, I can stop it while it turns so I guess it is normal, I do some escorting for paddling so I'll have to turn the motor off when there is paddlers in the water