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1938 SQUARE FOUR CLUTCH PLATES

Posted: Mon Jun 10, 2019 9:40 pm
by ralph thetford
I am now working on the clutch and wondered ----(1)what is the thickness of the cork inserts on a new disc and (2) what is the acceptable minimum thickness of the corks before they need replacing ?------I have measured mine and on average the thicknesses are approx 0.200 inches.


Regards Ralph Thetford

Re: 1938 SQUARE FOUR CLUTCH PLATES

Posted: Tue Jun 11, 2019 2:27 am
by nevhunter
They don't seem to wear much. As long as the steel doesn't contact you can use them .Corks must not be loose. I would be happy with about 1/2 mm sticking proud of the steel surface, evenly both sides. If I did them new I'd go for a bit more. Facing them off flat is not easy. If they are too thick the discs pop out of the basket when you declutch and you lose drive.. Nev

Re: 1938 SQUARE FOUR CLUTCH PLATES

Posted: Tue Jun 11, 2019 1:09 pm
by ralph thetford
Thanks for your help Nev, I think mine will be OK to use.

Regards Ralph

Re: 1938 SQUARE FOUR CLUTCH PLATES

Posted: Tue Jun 11, 2019 4:40 pm
by will_curry
Just now dug out the new clutch plates from AOMCC Gearbox spares.

The corks are near enough to 1/4" thick to make no difference.

Re: 1938 SQUARE FOUR CLUTCH PLATES

Posted: Tue Jun 11, 2019 4:50 pm
by ralph thetford
Thanks Will , mine are around 0.200 inches so should be OK---Regards Ralph

Re: 1938 SQUARE FOUR CLUTCH PLATES

Posted: Tue Jun 11, 2019 6:57 pm
by robjameson
I re corked my clutch plates not long ago and I think they are done to 0.250

Re: 1938 SQUARE FOUR CLUTCH PLATES

Posted: Tue Jun 11, 2019 10:19 pm
by ralph thetford
Thank you for your help Rob--Mine are around 0.200 inches and clear of the disc so should be OK

Regards Ralph