912 clutch pedal spring

[haybayhill0]

Restoring my 1969 912. Reassembling the pedal cluster, I realize that the clutch pedal spring "pushes" the pedal, thereby assisting declutching, rather than returning the pedal , which I expected. Am I missing something (I'm old)? If not, What is the spring's purpose? Thanks, Bob Prentice

[cgarr]

That gives you a "hot" clutch. The bearing is always running on the pressure plate. Pretty much takes any slack out of the pedal but on my 69 I did away with it and adjusted the pedal or put a stop in it so it would only come back so far then added a spring at the transmission to pull the cable back to disengage the bearing. The original setup works OK but my pressure plate fingers were ending up with big grooves in them almost through with the hot clutch setup.

[haybayhill0]

Craig, But this appears to be the way Porsche designed it: is that the case? Bob

[cgarr]

It was designed that way but I think only for 1969 which was the last year. I would be interested to see if the 69 911 was also that way?

I know it seems odd, the cable is held tight by pulling it forward.

[haybayhill0]

Wayne's book(101 ways etc.) shows a photo of the spring doing the same thing and I presume it's from a 911. But I still don't get the pros and cons. Bob

[dlagerstrom]

The same vintage 912 and 911 use different clutch mechanisms. They work opposite, one pulls and one pushes the spring on the pedal does indeed work the opposite of what you would normally think.

[haybayhill0]

Craig and Dave, Thank you both. Hard to fathom why Porsche would design two opposite mechanisms for pedal control- must have -/+ effects on release bearing and ,as Craig notes, on clutch fingers. Maybe there's an old Porsche design guy out there who can explain it. Bob Prentice