Clutch problem

[dingocooke]

Paul you need another spliff mate!!

From what you describe Steve, I think you know need a bit of adjustment of the pushrod to make sure almost all the lost movement is taken up by the adjuster rod, so you get the benefit of the slave cylinders travel, you only need a tiny clearance between release bearing and cover plate, probably best to take off your clutch return spring (if fitted) to check this.

[wilf]

If you do have to adjust to a "tiny" clearance, keep an eye on it at regular intervals - as the clutch driven plate wears, it will close up that clearance, ultimately causing slip.

[dingocooke]

fair comment

[Cobra289]

Originally Posted by wilf

If you do have to adjust to a "tiny" clearance, keep an eye on it at regular intervals - as the clutch driven plate wears, it will close up that clearance, ultimately causing slip.

Hi,
We always talk about to remember this clearance, but if you look to new developments in the T/O bearings you will find that new cars use to have "zero clearance" specifications.

The hydraulic T/O bearings are an example, read the Howe T/O installation pdf file.
http://static.summitracing.com/globa.../hre-82870.pdf

I found that when I was using the Audi slave cylinder (click connecting line) I found that the slave cylinder internal spring was to heavy and so I did some search and found that most of new cars T/O are designed for "zero clearance" and have just a bit of preload.

The self aligning is a different feature and always welcome for our cars, due to the fast wear of our clutches.

So what do you think about?
This feature will solve a lot of problems with slave stroke by lots of people.


PS
Here is a PDF file from Mcleod where is shows the capability for "Constant Running" of the T/O
http://www.mcleodind.com/downloads/P...ing_Manual.pdf

Regards,
Cobra289

[wilf]

Constant running of the throwout bearing is one thing, (and bound to happen in the very nature of hydraulics systems, unless you have some hefty pull-off springs on your slave) but holding the clutch back from full engagement is another. A small clearance has to be maintained on our set ups.

[Cobra289]

Originally Posted by wilf

Constant running of eh throwout bearing is one thing, (and bound to happen in the very nature of hydraulics systems, unless you have some hefty pull-off springs on your slave) but holding the clutch back from full engagement is another. A small clearance has to be maintained on our set ups.

I agree with that!

Just to be shore, that some dubious quality T/O, will stay inside the bell housing for a wile or two.
I was just surprised with the internal spring of the slave cylinder of the Audi, they don't use the fork return spring.
This spring will eliminate all the clearances that there is at the T/O.

Regards,
Cobra289

[dingocooke]

I notice cobra 289 refering to internal hydraulic bearings, a different kettle of fish altogether; they have their own clearance specs, and if my experience with McLeods POS product is anything to go by, youll be whipping the gearbox out every couple of thousand miles to re seal it anyway-it has no realistic capability of running constantly without leaking, although the front bearing itself was fine at each strip down.

Modern clutch release bearings of the conventional type are intended to be set up with zero clearance, but importantly almost zero load, so as Wilf says, our faster wearing clutches will beed a weather eye keeping on them to ensure that the bearing is not carrying enough load to allow clutch slip and prematurely fubar the release bearing.

[Cobra289]

Hi Steve,

I know all about the Mcleod Hydraulic T/O bearing, I have one here taking some dust.
Those types need a perfect setup of the pedal stop bolt, and that need to be checked and adjusted every two seasons.
Fixing the hoses of those types is also very important, and I know also all about that too.

But the link was for the more reliable "Hydraulic Howe" type, at the USA people are very please with this one.

Regards,
Cobra289

[wilf]

If you take apart some of the slave cylinders we tend to use on our cars, you might be surprised to find that many of them include a light internal spring forcing the piston "forwards" (i.e. into engagement with the clutch fork).
I have fitted a strong pull-back spring on my car to keep the release bearing away from the clutch pressure plate when not is use.