Pull type clutch question…. Options

[Larmo63]

Do I need a special clutch/pressure plate for a pull type clutch system I'm assembling for my 911 conversion?

Will this work? The trans is a '70-71' I've been told. But, I'm not familiar with this stuff. Thanks for the help.


http://www.ebay.com/itm/Porsche-911-65-69-...ecAAOSwhcJWFxS7

[oldie914]

A little history: For the 1970 911 model year, Porsche wanted a bigger clutch disk. To do this, they changed to a flat flywheel with the ring gear mounted on the pressure plate. The transmission case was reinforced with more ribs in the bellhousing and a steel insert inside the differential housing. The throw out arm bolt was threaded into the insert to keep it from pulling out of the case. The throwout arm was changed to fit the pull type throwout bearing. The throw out bearing is attached to the pressure plate and has two flat spots on the outer ring. To install, you have to bolt the transmission to the engine and the reach inside the bellhousing with a screwdriver to engage the throw out bearing and arm.
In 1972, Porsche introduced the 915 transmission which had a clutch throwout arm inside the bellhousing which simplified things a lot. They continued to use the the 1970-71 flywheel system.
Here is some information on parts interchangeability based on how we used to mix and match 40 years ago. I'll admit my memory is not perfect.
1. The same flat flywheel was used from 1970 until Porsche changed the number crankshaft bolts. I think for the SC in 1983.
2. The pressure plate and ring gear for the 2.4 and 2.7 911s will fit a 2.2.
3. The 1970-71 clutch disc is model specific because the 915 transmission input shaft has a different spline.
4. The 1970-71 throwout bearing is model specific because of the flat spots needed for assembly.
There was an article in Porsche Panorama in the 1970s about converting a 914/6 to a pull clutch.
Hope this helps.