Squeaking clutch/throw out bearing

[patrickxdf12]

Hello! 
i just finished manual swaping my r34 skyline with a r33 rb20de box(RB71C)box 
When the car is running it squeaks crazy loud and it was smoking from the gearbox area. The gearbox is fine it was tested. The clutch slave cylinder seems like it doesn't fully releases the clutch. I want to ask if this noise is from the throw out bearing or could it be the clutch assembly or disk

[Duncan]

When you say it is smoking from the gearbox area....is the clutch also slipping? On an uphill put it in a high gear and see if the revs rise faster than your speed does.

It is possible that the pedal or slave cylinder needs adjustment; have someone make sure that when the clutch pedal is up that there is some movement in the fork; if it is preloaded then you either need to back off the pedal length under the dash or use a shorter clutch slave rod.

If the fork is not preloaded but the clutch is still dragging you might have an issue with the release bearing size, that would be box out to measure and fix

[patrickxdf12]

Thanks for the reply. Yes the fork is preloaded. I also want to ask there is only one way for the throw out bearing to go on right? The flat side should go towards the gearbox. I am using an 18mm clutch release bearing sleeve.

[MBS206]

If the fork is preloaded, that's your cause.

Now find out what adjustment you need to make to allow the fork to release.

[TurboTapin]

4 minutes ago, MBS206 said:

If the fork is preloaded, that's your cause.

Now find out what adjustment you need to make to allow the fork to release.

I second this. 

[jayden_l33]

I am getting the same issue. Did you resolve it? I just got it after installing my new super coppermix and literally the same issue, new fork, new 18mm carrier, release bearing that came with the kit and replicated the exact same sound. 

[MBS206]

1 hour ago, jayden_l33 said:

I am getting the same issue. Did you resolve it? I just got it after installing my new super coppermix and literally the same issue, new fork, new 18mm carrier, release bearing that came with the kit and replicated the exact same sound. 

Is your clutch fork also preloaded like OPs was?

[joshuaho96]

14 hours ago, MBS206 said:

Is your clutch fork also preloaded like OPs was?

How would you even adjust the clutch if the pedal already has the correct free play? The operating cylinder has no adjustment in mounting position or rod length. On pull style clutches there is also no ability to adjust the bearing carrier. Push type I can see how adjusting the carrier height makes it all work.
 

15 hours ago, jayden_l33 said:

I am getting the same issue. Did you resolve it? I just got it after installing my new super coppermix and literally the same issue, new fork, new 18mm carrier, release bearing that came with the kit and replicated the exact same sound. 

If this is the twin plate clutch did you verify that your friction disks were oriented correctly? It's not mentioned in the directions at all you just have to notice that one side the friction disks have a part number on the hub fingers and a subtle coning to those fingers. Another thing that I noticed was if you put the friction disks in backwards the pressure plate fingers will not be even and flat when the clutch is installed.

[jayden_l33]

On 02/09/2025 at 8:26 AM, joshuaho96 said:

How would you even adjust the clutch if the pedal already has the correct free play? The operating cylinder has no adjustment in mounting position or rod length. On pull style clutches there is also no ability to adjust the bearing carrier. Push type I can see how adjusting the carrier height makes it all work.
 

If this is the twin plate clutch did you verify that your friction disks were oriented correctly? It's not mentioned in the directions at all you just have to notice that one side the friction disks have a part number on the hub fingers and a subtle coning to those fingers. Another thing that I noticed was if you put the friction disks in backwards the pressure plate fingers will not be even and flat when the clutch is installed.

It ended up being that orientation of the float hub in relation to the clutch disk, when I installed it, I heard a loud click and being stupid, I decided to not take it a part and check it. The hub didn't properly align with the clutch disk and was causing the issue. Definitely an odd one! Dahtone Racing was able to fix me right up, stand up blokes!

 

 

 

Edited 6 hours ago by jayden_l33

[joshuaho96]

3 minutes ago, jayden_l33 said:

It ended up being that orientation of the float hub in relation to the clutch disk, when I installed it, I heard a loud click and being stupid, I decided to not take it a part and check it. The hub didn't properly align with the clutch disk and was causing the issue. Definitely an odd one! Dahtone Racing was able to fix me right up, stand up blokes!

 

 

 

Yep, this bit another local owner. I caught it before putting the transmission back into the car, what I noticed was the pressure plate fingers weren't flat and even. It's more obvious with the pull style clutch because the throwout bearing ring was visibly not flat once everything is put together. Nismo should really update their instructions to call out this specific detail. I'm not even sure the clutch as-shipped orients everything properly.