Clutch (FLuid Drive) lever arm height

[James_Douglas]

Hi All,

 

I suspect that the clutch race shop screwed up the springs/lever arm adjustment on my '49.

 

The old timer who did mine for years retired a few years back and so we had to find someone new.

 

I have looked over all my books and documents...

 

I have the spring pressure at 1/5 inch, but MOPAR used a clutch plate with a certain spacer to set the arm height.  Problem is I cannot find anything that tells me when the cover is sitting flat on a table, what is the distance to the top of the arm supposed to be.

 

This is what one needs to be able to check to make sure that a shop adjusted it correct.  Otherwise, like in this instance one has to think it is correct as opposed to know it is correct.

 

Anyone ever measure the arm height of an NOS Borg and Beck 9-1/4 inch fluid drive clutch with the tan springs?  Or perhaps someone has one and can measure it?

 

Thanks, James

[Conn47D24]

Any luck on this James?  I'm at the same place.  Rebuilt my PP and with otu the " special " tool " in the service manual I'm guessing on how to adjust the three nuts on the fingers.

[dpollo]

There is a special  "fixture" for adjusting pressure plates but I have never had to use one.  I was told if the three arms are at the same height, leave it alone !  Since yours is already apart, perhaps you can set it up with a new disc using a flywheel or the driven plate to

serve as a "fixture"

 

As far as I know, this pressure plate is the same as the Plymouth ( without fluid drive)

[Dodgeb4ya]

I agree as to what dpollo says.

I have never had an issue with a clutch cover plate except on an adjustable large truck cover. Simple to adjust those.

Take it back or to another rebuilder.

[James_Douglas]

Any luck on this James?  I'm at the same place.  Rebuilt my PP and with otu the " special " tool " in the service manual I'm guessing on how to adjust the three nuts on the fingers.

Nobody out there seems to have a NOS one to measure...

[_shel_ny]

The sun is shining bright today, so I went to the shed to do some digging.

 

If measurements on this will help point me to where you want the measurement, and I will see if I can help.

[_shel_ny]

Just a quick pic, but does this measurement help????

 

 

 

EDIT:  this is an Auburn pressure plate.

Edited March 5, 2016 by shel_ny

[Conn47D24]

My D24 Clutch looks very different.  Nice detail on these pix though. 

[Plymouthy Adams]

as I read it, the pressure plate is affixed to a fixture and according to the size/style clutch disc, it is adjusted for equal drag around the circumference and not so much as an installed height...the only spring requirements is that they be within 10 lbs of pressure at compressed value on test...the fingers may be a slight bit uneven in installed height but with the pressure from the throw out bearing , once deflection is started, they will be equal in displacement for smooth anti chatter operation..it is not always a simple installed height requirement.

 

then again, I may not have read you question right...but based on the component names, it was as close as I could get to understanding..

Edited March 6, 2016 by Plymouthy Adams

[Dodgeb4ya]

Here's some good technical reading for you James!

 

Incorrect new clutch disc lining thickness would require a pressure plate adjustment change from OE specs. The use of a correctly built clutch disc with a properly built OE clutch cover set up is necessary IMO.

 

Modern brake  and clutch lining thickness dimensions are slightly different than what they used to be. Globally sourced material.

 

Many of today's re-builders don't seem to realize this is a problem with our old cars.

 

I think most of the friction rebuilding market is for more of the heavy duty market and most all brake and clutch parts are now sold as new for modern cars.

 

I've heard Tennessee Clutch and Supply is really good with the old cars.

Edited October 21, 2017 by Dodgeb4ya

[knuckleharley]

Here's some good technical reading for you James!

 

Incorrect new clutch disc lining thickness would require a pressure plate adjustment change from OE specs. The use of a correctly built clutch disc with a properly built OE clutch cover set up is necessary IMO.

 

Modern brake  and clutch lining thickness dimensions are slightly different than what they used to be. Globally sourced material.

 

Many of today's re-builders don't seem to realize this is a problem with our old cars.

 

I think most of the friction rebuilding market is for more of the heavy duty market and most all brake and clutch parts are now sold as new for modern cars.

 

I've heard Tennessee Clutch and Supply is really good with the old cars.

Guys,I am guessing the thickness differences are due to the ban on abestos.