Throwout bearing behaviour - help!

[JohninKuranda]

Just need some clarification in a gear crunching/unable gear change/clutch slipping saga.
When I run the engine in neutral, my foot no-where near the clutch pedal, the throw-out bearing spins. Depressing the clutch pedal 3/4" or so and the throw-out bearing stops turning. Fully depressing the clutch pedal, the TB remains stopped. When I remove my foot from the clutch pedal entirely, the TB once again spins.

If I start the engine in gear, the TB is stopped. When I remove my foot from the clutch pedal, the TB spins.

Is this the way it should work? If not, what do I need to do to correct?

Many thanks

John

[1930-Pickup]

Originally Posted by JohninKuranda

Just need some clarification in a gear crunching/unable gear change/clutch slipping saga.
When I run the engine in neutral, my foot no-where near the clutch pedal, the throw-out bearing spins. Depressing the clutch pedal 3/4" or so and the throw-out bearing stops turning. Fully depressing the clutch pedal, the TB remains stopped. When I remove my foot from the clutch pedal entirely, the TB once again spins.

If I start the engine in gear, the TB is stopped. When I remove my foot from the clutch pedal, the TB spins.

Is this the way it should work? If not, what do I need to do to correct?

Many thanks

John

I'm not sure what the heck your car is doing, but it should work exactly opposite of what you described.

[1930-Pickup]

Are you using bearing 'sound' to determine if the TO Bearing is spinning or not?

Sometimes, the TOB will be silent when the clutch is activated (pedal down), and noisy when the TOB is just barely touching the spinning clutch plate fingers.

[JohninKuranda]

Originally Posted by 1930-Pickup

Are you using bearing 'sound' to determine if the TO Bearing is spinning or not?

Sometimes, the TOB will be silent when the clutch is activated (pedal down), and noisy when the TOB is just barely touching the spinning clutch plate fingers.

I have the inspection plate off (plus a strong lumens torch) for a good visual.

[1955cj5]

Can you post a picture?

Perhaps the throw-out bearing is installed backwards?

[JohninKuranda]

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Originally Posted by 1955cj5

Can you post a picture?

Perhaps the throw-out bearing is installed backwards?

Photos attached - hope they are clear enough.

[1955cj5]

Comment wasn't relevant to a multi disc clutch.

[1955cj5]

Originally Posted by JohninKuranda

Photos attached - hope they are clear enough.

I think you have a multi-disc clutch........very different from what I have..


http://www.santaanitaas.org/wp-conte...l-Aug-2003.pdf

Randy


.

[1930-Pickup]

Looking at this diagram, it looks to me that you would not be able to determine if the TOB is spinning by looking at it through the inspection cover.

Only the front bearing surface should spin and the rest of the TOB stays in place. Cant see the front of the TOB due to the shield over the bearing.

If you can see the TOB spinning...there are issues!

Hey, its been a long time since I've been inside one of these clutches...so stop me someone if I'm on the wrong trek here.

[1930-Pickup]

Originally Posted by 1930-Pickup

Looking at this diagram, it looks to me that you would not be able to determine if the TOB is spinning by looking at it through the inspection cover.

Only the front bearing surface should spin and the rest of the TOB stays in place. Cant see the front of the TOB due to the shield over the bearing.

If you can see the TOB spinning...there are issues!

Hey, its been a long time since I've been inside one of these clutches...so stop me someone if I'm on the wrong trek here.

Oh, you have a multi disk?? Never mind

[1955cj5]

http://www.santaanitaas.org/wp-conte...l-Aug-2003.pdf

Note the last part of the section on throw out bearings...

"The multiple disk throw-out bearing
is mounted right on the clutch assembly
and mounts backwards to the single
disk throw-out bearing. The smooth
machined surface of the bearing is pushed
on by the fork located in the bell housing. "

[JohninKuranda]

Originally Posted by 1955cj5

Note the last part of the section on throw out bearings...

"The multiple disk throw-out bearing
is mounted right on the clutch assembly
and mounts backwards to the single
disk throw-out bearing. The smooth
machined surface of the bearing is pushed
on by the fork located in the bell housing. "

The smooth side is nearest the gearbox. The rounded side - the case? is facing the clutch assembly. Looks as it should from the diagrams above. When I say the bearing is moving I mean the part that I can see (with the nipple). From a spare TOB that I have for the MD clutch, I see that the bearing inside the TOB closest to the clutch moves. From my pictures and observations, I don't know if that is happening with the TOB currently fitted.

[iverson]

not sure of your problem but the bearing should turn free by hand with engine not running and foot off clutch

[iverson]

Yes the bearing should spin with the clutch with Eng running and foot off clutch

[glenn in camino]

Originally Posted by iverson

Yes the bearing should spin with the clutch with Eng running and foot off clutch

The only throw out bearing that can be greased. See pictures.