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Clutch Pedal No Feedback, Clutch Doesn't Disengage


Best Answer Rorf , 30 July 2019 - 05:51 AM

In that video one can plainly see there is movement of at least 13mm (1/2 inch) on the clutch arm. But judging by how the clutch arm has been bent (the usual bodge modification for a worn ball) I would replace the plunger, clutch arm and all pivot pins.

 

Might even be better to replace the clutch and pressure plate whilst you are at it.

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#1 Echan42

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Posted 29 July 2019 - 05:24 PM

So while I'm waiting for my new radiator and wanting to follow up on my last thread with results I've run into another issue on my 1972 mini 1000 (pre verto).

 

My cluch release bearing was very noisy and I was having trouble shifting into gears, suddenly I lost all feedback on my clutch pedal and it shifted into gear no more.

I knew what had to be done.

 

So my new clutch release bearing came in the mail and after fitting it I was dissapointed to see that even though my bearing clutch didn't squeel anymore when I pressed the pedal in I'm still getting no feedback and I can't shift into gear.

The plunger on the clutch cover makes contact, but I don't really see it moving when I press the pedal, I'm not seeing much movement from my clutch lever arm.

The arm was pretty worn so I've already ordered a new one. Could my slave cilynder not be pushing the arm hard enough? I opened the bleed valve witch the pedal pushed and I didn't get any air just liquid.

 

tl;dr:

Syntoms: Clutch bearing noise, difficulty shifting into gear, suddenly no clutch pedal resistance or feedback

What I did: Replaced bearing, ordered new lever arm

What changed: no more noise

 

Here's a video to further backup my explanation

https://dump.video/i/Vd5AEv.mp4

 

 



#2 timmy850

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Posted 29 July 2019 - 09:41 PM

Mine did that when the clevis pin fell out of the master cylinder. I'd also check all the other clevis pins aren't worn as even a tiny amount of wear makes a huge difference. Are you getting full stroke from the clutch slave pushrod?



#3 jonjosar

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Posted 29 July 2019 - 10:06 PM

Its a bit difficult to see but there doesnt look to be any movement in the throw out lever?



#4 Rorf

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Posted 30 July 2019 - 05:51 AM   Best Answer

In that video one can plainly see there is movement of at least 13mm (1/2 inch) on the clutch arm. But judging by how the clutch arm has been bent (the usual bodge modification for a worn ball) I would replace the plunger, clutch arm and all pivot pins.

 

Might even be better to replace the clutch and pressure plate whilst you are at it.



#5 Echan42

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Posted 30 July 2019 - 08:30 AM

Its a bit difficult to see but there doesnt look to be any movement in the throw out lever?

 

There's preassure applied, but it's not moving, the plunger is not stuck as when I remove the arm I can manually pull it in and out with smoothness, I also feel the clutch touching the bearing.

 

In that video one can plainly see there is movement of at least 13mm (1/2 inch) on the clutch arm. But judging by how the clutch arm has been bent (the usual bodge modification for a worn ball) I would replace the plunger, clutch arm and all pivot pins.

 

Might even be better to replace the clutch and pressure plate whilst you are at it.

Oh wow! You're right, I didn't relize the clutch arm was bent (first time mini owner I just assumed they we're always bent) I went ahead and ordered plunger and clutch arm from my local spares dealer, that will hopefully fix my issue. Thanks!



#6 MiniMadRacer

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Posted 30 July 2019 - 09:55 AM

As has been suggested I would replace the Clutch plate as well and check the primary gear end float and primary gear oil  seal while you are at it. The parts are cheap enough and you really don't want to put it all back together again and still have a problem, necessitating another strip down 



#7 Echan42

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Posted 02 August 2019 - 07:10 AM

Fixed! Thanks for your help.

 

The issue was the arm was worn and had previously been bent to counteract the fact it had degraded, and the plunger was also in bad shape.

Replacing the arm did not fix anything, there was still some play between both pieces, I swapped the plunger and voalá! issue fixed, it shifts like a charm!

Plus I replaced my noisy clutch bearing, wich had noting to do with the issue but did make a lot of noise.



#8 Rorf

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Posted 02 August 2019 - 07:24 AM

Well done - also change the clutch fluid, part of preventative maintenance :D



#9 Echan42

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Posted 02 August 2019 - 07:43 AM

Well done - also change the clutch fluid, part of preventative maintenance :D

When I was bleeding the slave the liquid came out black, so I'm definetly gonna get that done. How do I purge the system?



#10 GraemeC

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Posted 02 August 2019 - 07:59 AM

Just keep bleeding and topping up with fresh fluid until the fresh fluid comes out of the nipple.






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