993 Carrera 4 clutch

[fast911ray]

Hello all. Even though I owned an independent Porsche shop [Motodelta] in Chicago for 20+ years, I never had the occasion to replace a 993 Carrera4clutch. Sadly it appears that time is fast approaching for my own 993 Carrera4. Naturally all my shop manuals went along with the business when selling the lot in november 2003, so I'm doing this job, at home, by intuition alone. Any tips or advice offered would be dearly appreciated...other than having the local dealer do it I mean

[Atlantic07]

I think it's great you do it yourself! I just had it done (964 though), because I chickened out and didn't have the lift. Now I think I could do it as well (thx to my awesome mechanic who let me come anytime and participate in the whole job).

Maybe one tip I could give you is how to shop:

I looked for the clutch and flywheel (which could not be reconditioned) on ebay to get a feel for a cheap price. And in fact, the prices were much cheaper than what dealers offered. I then called my dealer and asked him if he could match the price - and bingo he did. Saved me about $380.

Let me know if you need any info.

[slammed1000]

check out the rennlist site as there has been a write up article about it step by step...pretty straight forward

[fast911ray]

Thanks Slammed, I'll check it out. And thanksto you Atlantic..I still have my wholesale parts contacts so parts price is not a problem. Actually. I'll just change the disc [my cost $105.00] since the car is low milage..just 61,000.

I was an idiot for trusting a Valet [would you believe, at a PCA event even] to park the car..something I never do. My girlfriend did not want to walk the 2 blocks, so I gave in and viola! Fried disc..

Thanks again guys.

[aigel]

Next time drop the GF off. I don't even give my beater to a valet.

G

[john walker's workshop]

so you're going to spend 15 hours or thereabouts and just replace the disc? i would reconsider that IMHO.

[fast911ray]

Thanks for your input John. In the past I've changed just a disc at my shop [ low mileage cars having undamaged friction surfaces or diaphragm] with no difficulties...in fact I did that as a yearly maintenence procedure on my own 911racecars, changing pressure plates every other year.

About my C4. I'm having second thoughts about it being a worn friction disc. There is absolutely no slippage at full throttle, in any gear...and when provoking wheelspin, the ABD engages. Correct me if I'm mistaken, but isn't disc wear indicated by a very high engagement point? Naturally slip of any amount is a sure sign of a badly worn clutch, and since neither of these are present, I'd tend to eliminate the clutch assembly as being the culprit.

My problem is the engagement point is quite low...75mm from the floor at start-up..50mm after operating temp is reached. I just did a thorough hydraulic system ..ran a full litre of Ate blue through the system thinking that might have been the cause. Have not fired it up yet but will tomorrow. If that does not raise the pedal some I'm thinking about adjusting the pushrod a slight bit...as a last resort. Any thoughts on the problem?

Any suggestions or ideas would be most welcome. Needless to say, I certainly do not relish the thought of pulling the motor or trans on a C4 I'm not being paid handsomely to do.

[fast911ray]

Well it appears a flush with Ate Blue has cured the problem. The cold engagement point seems to have risen to a more secure feeling 100mm when cold. Whew...