g-50 clutch questions

[kepperly]

Please those in the know please explain this to me. I have recently purchased a "spring" 240mm clutch for my 87 carrera.
I also have an older mildly used rubber center clutch for the same car. how will the spring clutch ever function in the same place that the rubber centered clutch came out of. granted both are 240 mm in diameter but the thickness of the rubber center is over 3 times
that of the spring clutch. did I get the wrong spring clutch? and if not what takes up the space left by the rubber centered one. the number on the old one is 20.1862 137 001 and the new Sachs # is
Porsche part # 930.006.014.01 / 930.116.014.02 with the Sachs #
1861 568 331. The old rubber center is 65mm thick and the new Sachs is aprox. 25 mm thick. both clutch disc's have 10mm thick
wear surfaces. The new clutch was said to fit 76-77 turbo and 87-89 carrera g-50.

thanks in advace and anybody in Wichita, Kansas don,t forget
about the monthly Porsche club meeting this tuesday the 5th
at willy's c's at kellogg and west street 6:30 pm..

keith epperly

[masraum]

The rubber centered clutches are very thick. The replacement clutches are much thinner. The important part is the frinction material. I'm not sure since I've not really checked, but I think the rubber excess goes into the center of the pressure plate where there is some extra room.

[JDaniel]

I'm not sure of the numbers, but I did buy the 240mm spring centered clutch plate for a '76-'77 turbo for my '87 carrera. I bought it from Pelican and it works perfect. I don't even have that anoying growl at low speeds.

[kepperly]

Dan,
What takes up the room left by the rubber center? one is
65mm and the other is 25mm?

keith

[Rick Lee]

Keith, it will fit. The pressure plate just won't flex as much. The spring-centered disc is supposedly far more reliable than the rubber-centered. When I bought my Sachs G50 clutch kit, it came with the spring-centered disc and it works great. Take my word for it - it will work.

[john walker's workshop]

nothing needs to take up the extra space. using a spring disc is a common swap, although the late model rubber hub discs work fine, and don't break up like the early ones.

[KTL]

I've got the same 930 disc you describe. So does Richard LeSch., and J Daniel. You don't need to worry about the space left by the narrower damper of the spring disc since the pressure plate contacts the disc at the friction surface, not at the center hub. So, nothing is in contact with the center hub of the disc other than the trans input shaft and the disc only needs to slide on the shaft. I imagine the large depth of the rubber damper was necessary to achieve the desired dampening and assure longer life than the previous rubber damped discs?

I don't know if what I said makes much sense. But I do know when JW speaks, you can count on it like the sun coming up tomorrow!

[Steve Baker]

Forget about the size the spring type will fit fine. Be sure to replace the throw out arm and the shaft too. My arm was worn badly and the needle bearings were just about gone on one side. Thanks to the others on this site mine works great. It took 4 weekends, but I changed a few other items while the engine was out. Good Luck!