clutch shaft seal: why do I need three of these
 

In the parts catalog they require three of these seals anyone know why? All the diagrams show only one.

Porsche 911 & Carrera Clutch & Flywheel - Page 7

915-301-139-00-M30

Throw-Out Lever Seal (sold per each), 911 (1974-77, 1 req.), 911 (1978-86, 3 req.), 911 Turbo (1976-77, 2 req.)

I put 2 on the throw out arm (above and below where it attaches) and one on the lower part of the shaft shown in the diagram. I believe the 101 projects tells you there are supposed to be 2 on arm itself. When I took my trans out it only had 1 on the arm and the replacement trans I got only had 1 or maybe 0. it is really just to keep grime/dirt out of the shaft and both worked fine like that.

Same as mine........
 

Those are just dust/dirt seal. Two (2) will be just fine but they are not that expensive. So having an extra seal on top would be better IMHO.

Tony

one above the release fork in the bellhousing and the other two above and below the long release arm.

They can make it tough to catch the circlip. I had a real struggle with mine but eventually got it by using a socket and a persuader to seat the arm over the circlip groove.