clutch problem

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raynernick
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clutch problem

Post by raynernick » Thu Apr 06, 2017 1:10 pm

I have got a clutch problem.
I thought is was the master or slave cylinders so I have replaced them.
To be fair the slave if not seized was very close - it's ok now.

Having done this, I actually seem to have the same problem as before.

I cannot fully disengage the clutch.
The plunger of the slave cylinder is visible slightly out of the end of the assembly (bad!)
The clutch arm appears to be stuck in some way and not fully returning.

I am thinking a broken spring in the clutch and time for replacement?
Can you bend a clutch arm?

What do people think please?
Thanks

Nick



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Re: clutch problem

Post by peter freeman » Thu Apr 06, 2017 1:20 pm

Given its shape I don't think bending the arm is a good idea as once it is bent it will loose its strength. When you say the plunger is visible do you mean that the cylinder is not going far enough back. Try spraying a lubricant of some sort ( not WD40 ) at the pressure plate and release bearing - with luck the stuck bit might free off. If you have to change the clutch at least you can get the gearbox out easier than you can with the later cars.



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Re: clutch problem

Post by roymck » Thu Apr 06, 2017 1:22 pm

Clutch arms can crack and cause problems . Is it possible to look into the clutch housing with a torch whilst somebody actuates the clutch from the car .



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Re: clutch problem

Post by raynernick » Thu Apr 06, 2017 4:51 pm

No, I haven't deliberately bent anything. Can it bend and that might be the problem?
The clutch hardly actuates at all. The engine seems difficult to start- the engine is newly recon.



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Re: clutch problem

Post by Coupe Racing » Thu Apr 06, 2017 5:11 pm

What material is the pipe between master and slave


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Re: clutch problem

Post by raynernick » Fri Apr 07, 2017 11:37 am

Copper pipe and in good condition. No leaks.



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Re: clutch problem

Post by Coupe Racing » Fri Apr 07, 2017 4:10 pm

Has the release arm become dislodged from the pivot
Is the circlip on the slave and in the groove
Has the master cylinder been changed and is the stroke long enough


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Re: clutch problem

Post by scmarf » Fri Apr 07, 2017 5:08 pm

A given stroke on the master cylinder will displace a certain amount of fluid which will be translated to a corresponding stroke at the slave cylinder (assuming you don't loose any with a spongy pipe but that has been mentioned). The slave piston should find it's 'resting' position in contact with the release arm wherever it may be (though I am concerned that it is nearly out of the cylinder - not normal :shock: - are you loosing any fluid?). So from a hydraulic point of view,
1) are you putting enough stroke into the master cylinder? (sub question: Have you got a lump of carpet stuck under the pedal? Is the clevis pin/hole worn?)
2) Are the master and slave cylinder bores correct so as to provide the correct stroke at the slave cylinder? (sub questions: Has it always been like this? Did you replace like for like or get from a Scim trader?

Assuming that all checks out, if the release arm is off the pivot ball, or has split and is flexing under pressure, that will cause lost movement (as mentioned above).

Otherwise it could be in the bellhousing. Maybe the friction plate sticking on the flywheel (unusual) or the spline.

On the plus side - it's a nice weekend for it :)

PS: I assume there is no air in the fluid


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Re: clutch problem

Post by scimjim » Fri Apr 07, 2017 6:02 pm

I had a bent clutch arm on a 6b once - common problem on Land Rovers too.


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Re: clutch problem

Post by raynernick » Fri Apr 07, 2017 6:56 pm

Both the master and slave are new cylinders. - from Queensbury.
I had a problem before I changed them with noisy smoky clutch I could not engage.
Slave was just about ceased.
Circlip is on and in the correct place.
Clutch was new less than 15000 miles ago, but that is 20 years now.
Clevis pin is all ok
Release arm dislodged at pivot does sound likely especially is that causes loss of play.
Beyond my skill to sort out.



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Re: clutch problem

Post by scmarf » Sun Apr 09, 2017 2:08 pm

What car is this? An SE6 (Girling) slave cylinder will not give enough stroke on an SE6a (Lockheed) clutch mechanism.


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Re: clutch problem

Post by Coupe Racing » Sun Apr 09, 2017 3:38 pm

It's posted in the coupe section


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Re: clutch problem

Post by raynernick » Sun Apr 09, 2017 4:00 pm

1966 SE4a Coupe - no mods



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Re: clutch problem

Post by Oldconn » Mon Apr 10, 2017 8:10 am

scmarf wrote:What car is this? An SE6 (Girling) slave cylinder will not give enough stroke on an SE6a (Lockheed) clutch mechanism.
A few months ago I would have agreed with that, but in fact it does work, albeit with very long pedal stroke. I have been driving mine with this set-up since October 2016, and I get on very well with it.


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clutch problem

Post by raynernick » Wed Aug 02, 2017 4:33 pm

Ok - having finally get the box out and looked at everything I need:

A new 3 piece clutch, a clutch arm and new ring gear.

Do these parts come off any other car, is it the clutch a Mk3 Zodiac for example?
My car is a 1966 straight 6 coupe

Thanks
people

Nick



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