What Transmission Problem Could This Be?

[mo-mon]

Merry Christmas Pelicans!

While on a spirited run this morning, I was shifting from 2nd to 3rd at 6k rpm when I heard a bang & couldn't get into 3rd. I stopped. put the car in neutral, killed the engine.

Engaged 1st, started the car & was able to move. Shifted to 2nd, still ok but couldn't
get into 3rd. Drove it home in 2nd gear. When I stopped at the toll, clutch wasn't
working & the car lurched forward. Luckily, the barrier lifted & got home in 2nd.

I'm letting the car cool down before inspecting but what do you guys think is the
problem? Worn clutch? Shift fork? Car is a 1988 Carrera. TIA.

[john walker's workshop]

Some of them still have the original
rubber center clutch disc, which breaks up and blocks proper clutch disengagement.

[mo-mon]

Thank you John. Guess it's drop engine time.

[G450X]

Originally Posted by john walker's workshop

Some of them still have the original
rubber center clutch disc, which breaks up and blocks proper clutch disengagement.

Yup, they are still out there - I was driving my old SC through a neighborhood last year and saw a beautiful low mile (70k or so) Continental orange early SC with rear end jacked up inside a garage.

I stopped and talked to a nice gent, sure enough the original rubber centered clutch finally let go. That guy was raising cain how Porsche screwed up with their rubber centered clutches - after 40 years!

[midnightrider36]

if its an 1988 its a G50 car. did the G50's have rubber centered clutches as well?

[HaroldMHedge]

Here's one I recently pulled from my 87. I think it's the second clutch for my car since it had the updated clutch arm bushings.



The part has been replaced with a spring center disc 950-116-012-54.

[mo-mon]

Hi Harold. Did you do replace clutch yourself? I'm thinking of tackling this myself although I've never done this before.

[HaroldMHedge]

mo-mon,

Yes, I'm doing the work myself on the clutch replacement but have not gotten it reinstalled since I'm working through a split case rebuild first.

The Bentley manual does a good job of explaining the engine/transaxle drop, separation and clutch replacement.

During the removal I bent the crossmember M12 bolt mounts. This is a common problem since the bolt and crossmember corrode together.

If you don't have a lift, it's difficult getting the car raised high enough to remove the engine/transaxle.

[mo-mon]

I do have the Bentley & the G50 pdf (Thanks KTL) but no lift. Hopefully the smaller RUF tribute rear bumpers that I have allow a lower height for removal.

[HaroldMHedge]

It takes awhile but you can build platforms (ex. 2×6) for both the jack and stands. Just go slowly and think safety.