hmmm, why does my wheel turn?

[toman]

ok, so if I have the rear of the car up on stands, and I start the motor, my right rear wheel turns when the car is in neutral. Not hard, but enough. Is this normal? Is something wrong? It seems really odd...

[J P Stein]

Ayup, normal as dirt.

Friction (drag) from all those whirly thingys goin' round and round in the trans.
If ya grap aholt of that wheel (before it gets up a head of steam, please)
and stop it, the one on the other side will start in a turning.
If ya lay on your back, under the car, and get aholt of both at once,
they'll both stop..........or it'll spit you outta there like a watermelon seed This is pretty advanced lunacy and best left to a professional.

[sammyg2]

ROFLMAO!

JP, I think you mis-spelled watermelon :-)

BTW, that thing about grabbing both wheels from underneath, was that one of them BTDT's?

[red-beard]

It's the friction between the shaft and the gear sets through the roller bearings. And actually it's not friction of parts but the torque tranmitted through the gear oil. I'd bet as the tranny warms up, the wheel will turn slower.

The slotted part of the shaft gets a sleeve installed over it, then a caged set of roller bearings goes around that and then the gear spins around on the roller bearings. The gear turns independant of the shaft. How then does the tranny make the wheels turn? Look at the slider ring. There is a sort of triangular member which is locked to the shaft and the slider (It's encirclued by the slider ring). As the slider moves back and forth, it locks to the gear. All the other gears idle on the caged roller bearings.

When everything is idling, a little torque is transmitted through the viscous tranny fluid.

Take a look at 4th gear (5th isn't installed yet) with the slider and the triangular member.

[red-beard]

Photo

[toman]

thanks guys, very interesting stuff!

[J P Stein]

[QUOTE]Originally posted by red-beard
[B]It's the friction between the shaft and the gear sets through the roller bearings. And actually it's not friction of parts but the torque tranmitted through the gear oil. I'd bet as the tranny warms up, the wheel will turn slower.]

Ayup, and the oil transmits the torque by?

Friction is friction, whether metal against metal or, at the molecular level, oil molecules against oil molecules.

That's my story and I'm sticking to it.

[Scott S]

914 Quattro!

(dos?)

[red-beard]

If you remain glued to this thread, you certainly can stick around. JP....

James

"That's my story and I'm sticking to it" - Sheesh.