Clutch pedal adjustment issues

[Dimer]

About a year ago I started having problems with my clutch (twin plate Exedy). It seemed the clutch was always engaged. After we changed the oil, then adjusted the pedal, replaced the master and slave cilinder and clutch line it seemed the problem was solved. But then the clutch started slipping and went from bad to worse. It felt like the clutch pedal was under too much tension, so we adjusted it again with a bit more play. It now felt how it should be, but now I was having the same problem as before, the clutch seemed like was engaged again... When I stand still it is near impossible to put it in 1st or reverse and 3rd grinds (all gears feel perfectly fine when the pedal is adjusted with too much tension).

Could there be something wrong with my pedal? It is impossible to get it right...

 

[EdinKali]

Sounds like you have air in the system and it isn't fully disengaging. Check your clutch master and slave cylinders for leaks as well as all lines/hoses.

There is also a clutch pedal free-play adjustment procedure in the service manual.

 

[Dimer]

Sounds like you have air in the system and it isn't fully disengaging. Check your clutch master and slave cylinders for leaks as well as all lines/hoses.

There is also a clutch pedal free-play adjustment procedure in the service manual.

I recently installed new cylinders and lines, those should be fine. I will check the manual. But we have adjusted the pedal several times. Maybe we have done it wrong

 

[EdinKali]

Just make sure all the fittings are dry(ie. no leaks).

Hopefully it is just an adjustment issue.

 

[Larry Bastanza]

I have experienced this myself. I am going to give you my explanation for this, for what it is worth.

If the clutch is not 100% bled properly in the beginning, after repairs, then the pedal will have too much end play, and may not disengage fully(hard shifting). If you adjust the clutch to remove the end play all is fine, FOR A WHILE.

The NSX clutch fluid system is somewhat "self bleeding", so as time goes on, if there is air in the system, and you are using the clutch, the air will purge out of the system(bubbles in the reservior) and when that happens the clutch pedal gets tighter(less play) until the play is gone, and then the clutch starts to slip.

I have had this happen and it took me a while to figure out what was going on. Now in your case you had the EXEDY which could have cuased you to need to adjust the pedal, but also maybe it was not bled properly as well.

So I would bleed the system completely and make sure there is no air in it, then check the adjustment and make sure you have play in the pedal.

My $.02

Been there, Done that.

Regards,
LarryB

 

[menfou]

Hello,

I have a issue with a customer.
It seemed the clutch was always engaged too, it's very hard to pass the gears.
It's a Exedy twin plate.
When I press the pedal at idle, the rpm drop a little, and I have a small noise but I can pass the 2nd gear(very hard)
I have 1-2cm free in the pedal.

I have just 1 question, it's possible to have a disc incorrectly installed ? wrong direction ?


Thank you.

 

[Larry Bastanza]

I have 1-2cm free in the pedal.

Thank you.

Clutch pedal send play spec is 1-7mm

It sound like a lot of play 1-2 cm, confirm this?

HTH,
LarryB

 

[menfou]

Where do you measure the play spec ?
I didn't measure , but when I press the pedal with my hand, it's easy during 1-2cm.
I used a special vacum tool to remove all air.

I bled my NSX(RPS Clutch) , and 4 others NSX with no issue.
I really would like to know if it's possible to have 1 or 2 discs incorrectly installed ? wrong direction ?

 

[Larry Bastanza]

You measure the pedal movement with your hand, so you press and see the play, before the pedal gets firm. You can download the service manual here and see the pic in the first few pages of the "transmission/clutch" section of the manual.

It sounds like the clutch has way too much play, which would mean it will not disengage properly, which is what you describe as the problem.

Regards,
LarryB

Where do you measure the play spec ?
I didn't measure , but when I press the pedal with my hand, it's easy during 1-2cm.
I used a special vacum tool to remove all air.

I bled my NSX(RPS Clutch) , and 4 others NSX with no issue.
I really would like to know if it's possible to have 1 or 2 discs incorrectly installed ? wrong direction ?

 

[goldNSX]

As for installing a new master/slave: even after pumping a litre of fluid through the system I still had air in it. I had to bleed three times with much exercising the clutch between the bleed to get all air out. I had heavy grinding when shifting but only from time to time, after the third bleeding procedure it went away. Make sure you get all air out.

 

[silver2002]

The self bleeding is making sense. I just replaced master and slave. I bled it many times - clutch felt weak with a little too much play - only after I drove it for two days [this weekend] did the clutch finally feel back to normal - I also saw the bubbles when we were bleeding - I'll bet there is air trapped in the rubber of the new seals [and everywhere, including threads and piping hanging on as micro bubbles] that has to find its way out. I can see that if I had tried to take up the play, the system would further purge and then I'd have to re-adjust, because the play was not the problem to begin with. Thanks Boys.