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All right guys I have a 1983 Porsche 928 s replaced the clutch master cylinder and slave cylinder and now I cannot shift car through gears bled about 20 oz of fluid through system any suggestions
Remove the slave cylinder and push the rod in and let it spring back out, smoothly and to the full travel a dozen times. Reinstall it and bleed again, that should do it.
There might also be an issue with the length of the rod on the new master, I'm sure someone has the details. It has been posted before if you search.
Sounds like your old MC piston was shorter than the new one. Its a pain to get the MC in and out, so you could actually service the MC from inside the passenger compartment without too much trouble. Take your old MC apart and look at the length of the plunger/piston. You would have to remove the snap ring from the MC after draining it and cut down the new plunger/piston to the same length to restore the pedal travel and slave cylinder travel.
Also, how good are your clutch plates? I just went into mine last week for a look-see and found my second disc extremely worn and damaged. I reinstalled a new set I had and the clutch is so smooth it feels as if the lever isnt even connected.
Are you serious so its 100% my fault listing for cmc stated it was for 83 928s and as i am not a porsche guru i purchased what i seen was compatible with my car bud im not looking to be insulted im looking for the correct answer from intelligent people im not saying that your not intelligent just saying
All right guys I have a 1983 Porsche 928 s replaced the clutch master cylinder and slave cylinder and now I cannot shift car through gears bled about 20 oz of fluid through system any suggestions
Glad I didn’t get e-mail notification of a response and just now saw this.
Let’s try this again:
Order a new CMC for any 928 and you will get a CMC that doesn’t work in a pre-‘87 dual-disc system.
There is no bleed process that will make it work. No hacks, witchcraft or mind-over-matter effects will make it work. The GTS CMC’s internal guts are just too F#$&ing long and therefore bottom out before they’ve moved enough fluid to get enough travel for a dual-disc from the slave cylinder.
Why? I don’t know. Someone at PAG or ATE screwed up an no one at either institution GAF.
That’s why it’s not - NOT, not - 100% fault of someone doing this...
There are plenty of supersessions of parts that work for parts that don’t work.
The only way to figure out which supersessions will screw you is to get screwed or to research before you do the job. Or, simply put: “Porsche screwed me once, shame on them. Porsche screwed me twice, shame on me.”
Lol agian i apologize thanks for the info car is is up a running again i ended up putting old cmc back in useing seal from new one no leaks works great thank you
Lol agian i apologize thanks for the info car is is up a running again i ended up putting old cmc back in useing seal from new one no leaks works great thank you
And there you go. For future reference, for the pre-'87 928s, I'm going to have CMCs rebuilt. And for '87+ too. This will ensure that a) they operate at all and b) operate as expected. The GTS CMCs just feel plain weird even when they work in '87+ and always require that I explain to a client why their clutch muscle memory now has to be retrained.
Next, you might want to locate a spare CMC (used, 928 Internaltional, etc.) for you car and have it rebuilt now. Your new seals will (likely) get destroyed in the (likely) rusted bore of the old CMC.
Last, Kudos: swapping out, again, the CMC in a day shows determination. It's not the funnest job. Some folks cut a hole in the chassis metal to make it easier (a solution which I do not approve of.)
10-27-2018, 10:59 AM
clutch
