To wide clutch disc

1941 - 1945, MB, GPW Technical questions and discussions, regarding anything related to the WWII jeep.
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Ladislav
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To wide clutch disc

Post by Ladislav » Sun Apr 15, 2018 12:46 pm

After years, again something new for me...
It looks I have installed new disc to wide (0,36 INCH) in my jeep. What is the correct size (0,335 INCH ?)?
Can this difference be adjusted on the pressure plate fingers?
Thanks,

Lad.

bantamj
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Re: To wide clutch disc

Post by bantamj » Sun Apr 15, 2018 1:58 pm

Yes, the finger height can be adjusted to deal with the thicker disk.
But I would not do that and test fit the gearbox on the engine and if the fork is in the proper range all is fine.
There is a lot that alter the fork distance, for example flywheel skimming, crank shaft rebuilds, etc..

Luc

Ladislav
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Re: To wide clutch disc

Post by Ladislav » Sun Apr 15, 2018 11:39 pm

Thanks ,
what do you undestand under "fit the gearbox on the engine"?

Lad.

bantamj
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Re: To wide clutch disc

Post by bantamj » Mon Apr 16, 2018 1:32 am

Lad, the fork is pivoting on the T84 and the clutch is on the flywheel.
The distance between the flywheel and T84 is important as it alter the fork action.
Many parameters that can change that distance.
A thicker clutch disk will bring the fingers further away from the TO bearing...resulting in a fork that has to move further to release the clutch disk.
A skimmed flywheel will do the same.
Reground crankshaft thrust surface change that distance to.
Clutch group's are differing in height, forks are differing in shape, a gearbox that has no gasket between bell housing and gearbox change pivot ball height, The TO sleeve differs from one with another....etc..
All these parameters small changes together make a big difference, and the final sum can only been seen when you attach the gearbox on the engine and check the fork position.
The best check is to hook up a clutch cable on the fork and remove the pivot ball from the clutch pedal cross over tube on the T-case.
Lever the cable with a pin through the clutch cable in the pivot ball bore.
Put the gearbox in gear and if the clutch works fine and the fork is in the right position, you will be able to turn the gearbox by hand with the clutch disk freely rotating between flywheel and pressure plate.
The clutch must be released completelly while the fork is still 1 or 2 mm away from hitting the bell housing.
More is to much.
If you have a jeep with a good working clutch you can make a caliber to measure fork position.
But either way you need to test fit the gearbox on the engine..

The pictures ilustrate what am trying to explain, the small bend wire is my test gage, but when assembling a GPA am always trying the clutch with the lever...A GPA is a pain to remove the clutch :(

Luc
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Ladislav
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Re: To wide clutch disc

Post by Ladislav » Mon Apr 16, 2018 12:07 pm

Hi Luc,

that sounds clever... Yes it is better test the clutch before the body is installed. I could resolve my problem today, small adjustment on fingers was enough..
Thanks for responce.

Lad.


bantamj
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Re: To wide clutch disc

Post by bantamj » Mon Apr 16, 2018 12:36 pm

Good luck Lad! Keep up the great restoration work 8)
Luc

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