Elephant in the room

[jcw99]

Throw out bearing. Also called a release bearing. It's the bearing that pushes in the clutch fingers when you push down on your clutch pedal.

[humfrz]

Originally Posted by rascasse

Sorry but what's TOB?

It's what you call a "thrust bearing".

Like @jcw99 says ...... it moves the fingers of the "pressure plate" part of the clutch system.


humfrz

[pantdino]

Originally Posted by rascasse

Thanks for the replies guys!

So i presume you get this knocking feeling as well but it's just normal?? i've never felt this in any car before. It basically feels like something is going to drop off at low speed on a rough road..very disconcerting lol

It sounds like the OEM bushes are not doing a very good job then if the column moves around like that and can be felt through the pedal, i should say it's actually felt more through the pedal than anywhere else. So BRZ has stiffer spring rate in front, do they feel it more than us 86/FRS owners i wonder??

I think the best thing would be to drive another car for comparison. It's impossible for us to know what and how much vibration you're feeling. Is there a dealer or a car lot around you that has a car you can drive? Even if you have to drive a different car there and pretend you're looking for a car it would be worth it.


BTW, would you say "look for a stockist with an example in their forecourt"? I love Queen's English.

[rascasse]

Originally Posted by humfrz

It's what you call a "thrust bearing".

Like @jcw99 says ...... it moves the fingers of the "pressure plate" part of the clutch system.


humfrz

No way!!

This is exactly what my dealer thinks the issue is!! Thanks for confirming what that meant. They said that when they got it on the ramp they could def hear it clunking. I said but how come i can't hear it when going quicker and they said you wouldn't over engine noise etc..They said they will try to do the work under warranty but it might be down to wear from previous owner and in that case will need to get the money off the dealer i bought the car from..

I did a test tonight on my fathers rough drive and it's not really felt through the steering but just the clutch tbh. To the post above /\ i'm going to test also a 15 plate Giallo edition they have as a demo car and see if it makes the noise

'look for a car at the dealership to test drive'

Ps love the fact you have a Pantera!


Just thinking about this TOB issue...if it was that why can i only hear it/feel it over rough roads at low speed and not when on a smooth roads at low speed. Surely i would hear it all the time at low speed? Also i hear this noise the most with clutch down so not engaged..

'

[rascasse]

Anyone have the TOB issue and hear sounds like mine?

[Tcoat]

Originally Posted by rascasse

Anyone have the TOB issue and hear sounds like mine?

Several have. There are probably 10 threads on the subject.


http://www.ft86club.com/forums/showthread.php?t=96644

[rascasse]

Originally Posted by Tcoat

Several have. There are probably 10 threads on the subject.


http://www.ft86club.com/forums/showthread.php?t=96644

Thanks Tcoat

[rascasse]

I still don't get how my issue of hearing and feeling the knock through the clutch pedal over rough roads at low speed has got anything to do with the TOB?? my gearbox generally feels fine apart from being a bit notchy when cold..

[Tcoat]

Originally Posted by rascasse

Thanks Tcoat

There are many more if you dig. I have tried to find a pattern with the reported failures (Model year, mods, driver experience, etc) but there really doesn't seem to be one. Although there have been many reports I don't think that the issue is as rampant as some make it out to be and it is actually only a small percentage of the cars that suffer from it.
Some dealers treat it as warranty and some don't so there isn't even a formal recognition form Toyota at this point. If you suspect it is starting to go then get it fixed ASAP because if you leave it and have a catastrophic failure it can take out a pile of other more costly parts with it.

[rascasse]

Originally Posted by Tcoat

There are many more if you dig. I have tried to find a pattern with the reported failures (Model year, mods, driver experience, etc) but there really doesn't seem to be one. Although there have been many reports I don't think that the issue is as rampant as some make it out to be and it is actually only a small percentage of the cars that suffer from it.
Some dealers treat it as warranty and some don't so there isn't even a formal recognition form Toyota at this point. If you suspect it is starting to go then get it fixed ASAP because if you leave it and have a catastrophic failure it can take out a pile of other more costly parts with it.

Thanks for the info Tcoat. Well my dealer definitely thinks this is the issue and will try and do it under warranty but i think the knocking sound/feeling at low speeds is a different issue perhaps..

[Tcoat]

Originally Posted by rascasse

Thanks for the info Tcoat. Well my dealer definitely thinks this is the issue and will try and do it under warranty but i think the knocking sound/feeling at low speeds is a different issue perhaps..

I would agree with you as it does not match the listed symptoms. Pretty hard to guess what else it could be though.

[Ultramaroon]

Originally Posted by rascasse

I still don't get how my issue of hearing and feeling the knock through the clutch pedal over rough roads at low speed has got anything to do with the TOB?? my gearbox generally feels fine apart from being a bit notchy when cold..

Google for info on throwout bearings and automotive clutches. Then let's discuss any specific questions you may have. Based on the generality of your question I think this is the best approach.

[rascasse]

Originally Posted by Ultramaroon

Google for info on throwout bearings and automotive clutches. Then let's discuss any specific questions you may have. Based on the generality of your question I think this is the best approach.

Well I've had a look and symptoms of grinding when depressing the clutch seem to be TOB issues but i'm not getting this at all

[Ultramaroon]

Originally Posted by rascasse

Well I've had a look and symptoms of grinding when depressing the clutch seem to be TOB issues but i'm not getting this at all

My bad for not being clearer. Check out some pictures to notice how the clutch release mechanism sits right in between the flywheel/clutch and the transmission. It's not exactly part of either.

When you press the clutch, the TOB moves forward, pushing in the pressure plate fingers. Anything out of line or rolling unevenly will be felt pushing back at your foot. A hydraulic connection between the pedal and the clutch is a mechanical connection as much as any other.

Consider ABS (Anti-lock Braking System) If you haven't ever felt it kick in, you should familiarize yourself with it. Find a safe place to try locking the brakes. 10 MPH is plenty. Just stomp on the brakes and feel the kickback. That's all hydraulics.

Let me know if any of that doesn't make sense or if I'm not even addressing your question.