11 replies to this topic

[newenglandmini]

I have assembled my pre-Verto clutch.  I have installed a new release bearing and adjusted the bearing-to-flywheel housing clearance to 3/16" using the return stop bolt shown in the images.  I am concerned that there seems to be very little plunger travel when I actuate the clutch lever.  Maximum travel is only 1/8", measured as shown between the return stop and lever.  The plunger stop and locknut are backed fully off, and they are not limiting the plunger travel.  What is the normal amount of lever travel at this location?

 

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[nicklouse]

No idea where you get that measurement from.

There should be 20 thou clearance between the bolt head and the arm full pulled away from it.

And the throw should be about 1/2" at least.

Edited by nicklouse, 12 November 2015 - 08:28 PM.

[newenglandmini]

Nick, 3/16" clearance is specified by the Rover shop manual for the clearance between the release bearing and the inner side of the clutch cover (not the flywheel housing which I mistakenly referenced above).  This was the topic of an earlier posting.  As I read the manual, one uses the stop bolt to set the 3/16" clearance noted above, which means that there is zero clearance between the lever and the stop bolt when the clutch is engaged (pedal up).  See step 8a in the image.

 

When you mention 1/2" throw, is that at the lever-to-stop bolt, or the plunger linear travel?  In any case, I'm getting far too little travel.

 

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Edited by newenglandmini, 12 November 2015 - 09:06 PM.

[GraemeC]

Pull the arm lightly aware from the stop (ie so it's touching the diaphragm centre but not operating the clutch) then adjust the gap between arm and stop to around 0.020" (0.5mm).

The arm should have 0.5" of travel at the top of the arm (where the slave cylinder rod Is connected to it).

Edited by GraemeC, 12 November 2015 - 09:02 PM.

[nicklouse]

Again never heard of or used a measurement of 3/16" when setting the clutch.

As above.

[GraemeC]

From the bit of manual you have shown, I think that measurement is purely to ensure the release bearing is pushed on far enough during assembly, and not part of setting up the clutch operation.

[nicklouse]

Agreed on that.

[newenglandmini]

Graeme, I believe the measurement is part of the clutch set-up process.  The bearing is pressed on the plunger as far as it will go (to the shoulder on the plunger). The  3/16" setting by means of the stop bolt is to ensure that the bearing doesn't foul the clutch housing during operation.  Most owners will not be familiar with this process because it must be accomplished with the clutch housing removed, and with the release bearing accessible.

 

Getting back to my issue, I checked the travel at the slave cylinder end of the lever.  It is indeed about 0.5".  That gives me plunger travel of only about 1/8".  Seems minimal.  Can you confirm the normal amount of linear travel of the plunger?

[nicklouse]

Nope still don't see the need for that measurement. And as you say you have wound the big nuts right off.

The only thing you have not said you have done is set the return stop clearance 20 thou.

If once set you are not getting 1/2" thrips then rebleed. If still not check for worn pivots and holes. From pedal to ball on arm.

And again having replaced many a release bearing and built from new I have never ever had to consider that measurement. Not to mention it bring the first time I have seen it.( unless you posted it earlier which you may have done).

[nicklouse]

Thought you had.

http://www.theminifo...ring-clearance/

[GraemeC]

Sorry, but I can't agree.
You can't set the stop with the cover removed - the whole point behind setting the stop is to ensure that the bearing can fall free of the diaphragm thrust plate (so the bearing isn't always being driven round). This cannot be set without being able to find the touch point and working backwards so the casing must be assembled.

Doing it your way, the release bearing could be in constant contact with the thrust plate, if not applying pressure to it, and won't last 5 minutes before it wears and becomes rattley.

Read further in your manual - there will be a section on setting both the arm stop and the throw out stop.

[newenglandmini]

Nick/Graeme, I've reassembled the clutch using the method you described.  The clutch now has reasonable travel.

 

I have carefully re-read the service manual procedure and find that you are correct...the 3/16" specification is simply a means of ensuring that the bearing is not damaged during installation.  A later step makes reference to the 0.020" clearance to the return stop.

 

By the way, I also had an issue with the diaphragm spring.  You can view the related thread and see my manual clutch operation arrangement in my posting entitled "Diaphragm Spring Housing".

 

Thank you for your assistance.

Edited by newenglandmini, 14 November 2015 - 01:06 PM.