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Clutch Pedal Bottoming, Crunchy 2Nd Gear

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#1 Moshtaraq

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Posted 09 February 2021 - 05:13 PM

Hi again,

 

I fitted my new engine and I'm in the process of running it in. The only thing I didn't change or rebuild was the gearbox and clutch. Now I bottom out my pedal and when I shift to 2nd gear that nasty crunch happens :X. I attached a picture showing the pedal engaged and disengaged. Is it safe to back off the throw nut to give it a little more travel? And ofcourse lengthen the push rod/bend the arm preventing the pedal bottoming out?

 

I checked the clevis pin on the arm and there is no play on it.

There's a little play on the clevis pin on the clutch pedal where it meets the master. (can this be significant?)

I also bled the hydrolics to no avail.

Pedal feels smooth all the way.

Clutch plate didn't seem to be worn out during rebuild.

 

Thanks!

Attached Files



#2 MiniMadRacer

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Posted 09 February 2021 - 05:37 PM

On the verto clutch that throw out top does not perform any function so adjusting it will not help.

 

You either have a leak.. maybe master cylinder failing or slave cylinder letting fluid past the seals, or the clutch arm ball is worm or broken off (cracked maybe too).

 

And yes every little bit of wear in the linkage adds up to quite a lot of lost movement at the clutch end

 

I would start by checking the master and slave cylinder for weepage / leaks



#3 Moshtaraq

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Posted 09 February 2021 - 05:45 PM

On the verto clutch that throw out top does not perform any function so adjusting it will not help.

It limits the amount the plunger can be pressed in right? So loosening it would give it more travel (the nut touches the housing now) Or am I seeing it wrong?



#4 cal844

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Posted 09 February 2021 - 05:56 PM


On the verto clutch that throw out top does not perform any function so adjusting it will not help.

It limits the amount the plunger can be pressed in right? So loosening it would give it more travel (the nut touches the housing now) Or am I seeing it wrong?

Check the adjustment it's in the Haynes manual.

#5 Moshtaraq

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Posted 09 February 2021 - 06:08 PM

The nut is bottomed out if i try to adjust it to 6.5mm and it limits the travel even more so it would be counterproductive

#6 CK's mini

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Posted 09 February 2021 - 06:36 PM

Try to remove the play at the pedal clevis pin. I had a similar issue on my MG midget, it was the hole in the pedal which the pin goes through, it had elongated. A small amount of play seems to make a massive difference.



#7 Moshtaraq

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Posted 09 February 2021 - 07:08 PM

I replaced the clevis pin two years ago and it looks like it is gone already....

 

This is too much play?:

https://youtu.be/sqU5837qHqQ



#8 MiniMadRacer

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Posted 09 February 2021 - 07:26 PM

Hi Moshtaraq, you are correct in that it limits the amount the plunger can be pressed in  and therefore loosening it would give it more travel but the throwout stop has no effect on the point at which the clutch 'bites'

It is to stop damage to the crankshaft thrust bearings in the event of the overthrow becoming too great.
 

The above applies to the Verto clutch only not the pre verto



#9 Moshtaraq

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Posted 09 February 2021 - 07:32 PM

So the problem is not in the clutch but in the gearbox? I only hear a crunch going to second gear. Could it be the synchro/baulk rings?

Edited by Moshtaraq, 09 February 2021 - 09:54 PM.


#10 Moshtaraq

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Posted 10 February 2021 - 07:26 PM

I forgot to mention that it doesn't crunch when the car is stationary.



#11 MiniMadRacer

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Posted 10 February 2021 - 07:53 PM

When you built the Engine, (I note you didnt change the G box or clutch) did you set the Crank End float properly, and did you set the Primary Gear end float also?

 

Let us know the Crank float, and the Primary Gear float you set it too, so we can rule them out as an issue



#12 Moshtaraq

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Posted 10 February 2021 - 08:26 PM

The crank got new thrust bearings to get it within spec and the primary gear float was already within spec.



#13 MiniMadRacer

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Posted 10 February 2021 - 08:34 PM

If thats all in spec, I would still suspect a hydraulic issue or maybe a cracked ball on the end of the clutch lever

 

What oil are you using ? (clutching at straws now)

.



#14 Moshtaraq

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Posted 10 February 2021 - 08:41 PM

I'll check the slave tomorrow and take the arm of to check the ball. I'm using 20w50 by the way ;)



#15 MiniMadRacer

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Posted 10 February 2021 - 08:46 PM

Peel the rubber off the end of the slave and have a good look inside it... thats the right grade, and shouldn't be synthetic







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