Is my throw out bearing correct?

[kcpope]

How do you know the release bearing is on the right way. If it were reversed it wouldn't be cutting those grooves into the pressure plate fingers. I'm not totally sure it's backwards but if it were reversed it would work the way you expect it to I believe.
Also the pressure plate and flywheel look to have been hot at some point. I wouldn't run either of those if it was me. I would surface the flywheel or go to a lighter unit and replace the clutch entirely. It's a lot of work to get there again and the parts aren't crazy expensive.

That was my initial thought too. Looks like it might be on backwards [emoji2361]

After looking up prices, flywheels aren’t too bad either, so I’ll prolly just replace the whole flywheel/clutch combo.

Regarding flywheel/clutch, any suggestions(or what to avoid)? Or is standard rock auto pieces just fine?

Aluminum flywheel prices are outta my range unfortunately.


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[Zed Head]

Contact with the sleeve is in the center of the bearing.  The center contact area will be the same even flipped.

Only 240mm flywheels are available.  It's been that way for a long time.  You'll still be wondering about sleeve/collar height.  Might be worthwhile to look around for a complete kit.  Rockauto might not have all of the possibilities.

Here's a good one.  I've noticed that Summit seems to be upping their game.  Shows the sleeve as part of the package.  Luk is a pretty good brand.

https://www.summitracing.com/parts/luk-06-031?seid=srese1&gclid=CjwKCAiAq4KuBhA6EiwArMAw1A_fRkHgUpSEptzfiK9DwA4Dle70u3LwI0evTrz_vA_Prnej23vdxxoCTYAQAvD_BwE#overview

 

[Zed Head]

Flywheel too.

https://www.summitracing.com/parts/pio-fw-151/make/nissan/model/280z#overview

[Patcon]

I think the other face is wider and more round versus the thin edge that touches currently

[kcpope]

Flywheel too.
https://www.summitracing.com/parts/pio-fw-151/make/nissan/model/280z#overview

Cool. Regarding 240mm being the only version available, are they painfully slow revving?

Anyone with experience on that? Thx


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[kcpope]

Any reason this kit wouldn’t work?

https://www.ebay.com/itm/133895036475

I know it’s a 240mm flywheel, buts it’s lightweight at 14.5lbs, so that should make up for the increased size.

Also, Made in USA.

Anything I’m not considering?

Or there’s this kit, more expensive but a more known brand…

https://www.ebay.com/itm/133466728393

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[SteveJ]

7 hours ago, kcpope said:

Any reason this kit wouldn’t work?

https://www.ebay.com/itm/133895036475

I know it’s a 240mm flywheel, buts it’s lightweight at 14.5lbs, so that should make up for the increased size.

Also, Made in USA.

Anything I’m not considering?

Or there’s this kit, more expensive but a more known brand…

https://www.ebay.com/itm/133466728393

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How light do you want? https://zcardepot.com/products/copy-of-fidanza-lightweight-aluminum-flywheel-240z-260z-280z-280zx

https://zcardepot.com/products/fidanza-light-weight-aluminum-flywheel-240z-260z-280z-280zx?_pos=1&_sid=360548d86&_ss=r

And don't forget MSA.

https://www.thezstore.com/product/5258/price-drop-kameari-chromoly-performance-street-flywheel-70-83-zzx

https://www.thezstore.com/product/3991/high-performance-flywheel-70-83-z-zx-coupe-non-turbo

By the way, from what I read the 240mm flywheels have a different bolt pattern. From the ZCarDepot site:

 

 

New stock replacement flywheel for Datsun 280Z and 280ZX 1975-1983, 2+2 only or Turbo. The 2+2 clutch cover is slightly larger so it has a different bolt pattern. This is a good upgarde from a 2-seater clutch as the 2+2 clutch is larger, but you will need a clutch disk and pressure plate for a 2+2 to work. 

2+2= 240mm clutch

2-seater= 225mm clutch

 

 

Edited February 6 by SteveJ

[kcpope]

 

Yes, if I end up getting a 240mm flywheel, I’ll need to get the matching clutch and pressure plate.

Unless I get the Fidanza, which is 240mm, but apparently can accommodate either a 240mm or 225mm clutch and pressure plate, which is cool.

But before I drop $500 on a setup like that, I’m going to call a few shops and see if I can get my existing 225mm flywheel resurfaced and lightened. Will prolly be significantly cheaper than an aluminum flywheel, and add some performance gains.

Then I’ll just pair it with a decent (exedy maybe) clutch/pressure plate, and then go through the whole process of making sure I have the correct SLEEVE, ugh. This is prolly my best bang for the buck to eek out some performance gains, using quality parts, without breaking the bank. The trifecta!

We’ll see if I can make it happen…


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[Diseazd]

On 2/5/2024 at 8:04 PM, Patcon said:

How do you know the release bearing is on the right way. If it were reversed it wouldn't be cutting those grooves into the pressure plate fingers. I'm not totally sure it's backwards but if it were reversed it would work the way you expect it to I believe.

Also the pressure plate and flywheel look to have been hot at some point. I wouldn't run either of those if it was me. I would surface the flywheel or go to a lighter unit and replace the clutch entirely. It's a lot of work to get there again and the parts aren't crazy expensive.

I agree with Charles. If the throw out bearing is reversed it will fail. The rounded side should contact the fingers not the flat side. I had a machine shop install one in reverse and the bearing froze up and welded to the fingers. The wear on your fingers is not right……the PO reversed the throw out bearing. If I were you, I would buy a new Exedy clutch, disc, collar, bearing and pilot bushing, then you will know it’s right. Just make sure you know what flywheel you’re running, and make sure the rounded side ( not the flat side) of the bearing contacts the fingers. 240Z or 280Z pressure plates (225mm) are a different bolt pattern than a 2plus2 (240mm) flywheel.

Edited February 8 by Diseazd

[Diseazd]

This photo is correct.

[Zed Head]

If you watch the video in his first post you'll see that it's not a typical throwout bearing.  In your picture you can see the gap between the part that spins and the part that doesn't.  In his you can't see that gap on the back side, it's solid.  But the gap is there on the contact side, with the narrow contact surface.  And he shows that the bearing spins correctly on the sleeve.  It's just an odd bearing. 

OR maybe it has fallen apart and the actual contact surface is missing.  Just thought of that.  Maybe it's a broke bearing, installed correctly.  This is my new working theory.  More broken stuff, to fit with the missing flywheel pins.

Notice that the surface you're showing is rounded while his is not.  Deosn't really matter much becuase he already said he's getting all new stuff.  Just a puzzle.

[kcpope]

I agree with Charles. If the throw out bearing is reversed it will fail. The rounded side should contact the fingers not the flat side. I had a machine shop install one in reverse and the bearing froze up and welded to the fingers. The wear on your fingers is not right……the PO reversed the throw out bearing. If I were you, I would buy a new Exedy clutch, disc, collar, bearing and pilot bushing, then you will know it’s right. Just make sure you know what flywheel you’re running, and make sure the rounded side ( not the flat side) of the bearing contacts the fingers. 240Z or 280Z pressure plates (225mm) are a different bolt pattern than a 2plus2 (240mm) flywheel.

As it turns out, the TO bearing part number indicates its intended for a 240sx. And I *think* is facing the correct direction for that application, but questionable in this scenario…


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