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944 vs 968 clutch disk measurements
#1

Hey Folks,

 

I just finished replacing the clutch in my 968 and stopped moving forward because I was surprised to see where the throw out fork positioned itself once complete. on Clarks-garage.com there is a measurement test you can do to get a sanity check on your disk and that shows when measuring the distance between the back of the fork where the slave piston to the front of the clutch inspection port should be about 18MM when clutch is new and if more than 34MM it is time for a new clutch.  Does this same measurement apply to the 968?

 

Complicating things, I had the Flywheel machined 15 thousands (and the step as well).  I was told the PO of the car had done a clutch job, so it is possible that he had machined the Flywheel as well (given the grooves in the flywheel though, I doubt it).  I would expect this would effect the measurement backward, but not that much.

 

To add to the fun, I bought a Sachs clutch kit and used that disk and TOB but bought a "correct" new AT (or is it TA?) Pressure Plate through Pete at RS Barn. 

 

Anyway, I don't mind working on the car, but after $1,200 on machining, Sachs clutch kit and the pressure plate, I don't want to go 2,000 miles to find that the clutch is shot. 

 

I am off to church now, but will post a picture later of the fork through the inspection port.

 

Anyway, any thoughts on this would be greatly appreciated before I drive the car and there is no going back. 

 

thanks in advance,

 

Ken

 

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#2

Is the slave's piston pushing against that little "spoon" the way it should? In other words, is all the air out of the system and is the slave still ok? You could operate the clutch pedal a few times and see if anything changes.
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#3

Thanks for the quick response - the slave is operating fine and I had my wife cycle the clutch pedal 10 times or so.  Gotta figure out how to post a pic now....

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#4

Here is the pic

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#5

No problem. The measurements at Clark's would be applicable to our cars. My previous clutch had about 35 or 36 mm and the rivets were already messing up my flywheel. I would change the plate at 32 mm, just to be sure.


Here is a pic of mine. 25mm (+/- 1) gap. It is hard to see if it looks ok due to the angle. Take a piece of electrical wire to take an accurate measurement.



   
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#6

Yours and mine look about the same, but if Clark's Garage numbers are correct my new clutch is showing as having 1/2 life left and I would think that means it is because the pressure plate is not as compressed as it should be.  at 25mm, how old/how many miles are on your clutch?

 

thanks again,

 

Ken

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#7

About 28000 km or about 17500 miles. But I only recently changed my pressure plate from a 964 to the original one. And because of the problems that I had with the 964 one, I'm sure the pressure plate's lifespan is shortened.


I also picked up that a pressure plate wears quicker in the beginning than at the end of its service, but I don't know if that is true.
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#8

OK - thanks for the info!  I think I am going to move forward and assume all will work out ok.  Thanks for the help!

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#9

Anytime Ken.
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#10

Hey folks - I also was given measurements from RS Barn for the new disk and pressure plate for a 968.   He said 26MM is correct for a stock disk and new PP and that 32MM is time to install a new clutch.   Clarks-garage.com shows 18MM for a 944 and had me concerned (which is where the thread started in the first place).  I also had the DMF machined which surprised Pete, so not sure if that is a No-No.  I had seen posts here and/or on R.L. saying it is ok, but I know since it is old I risk the Flywheel failing from old age and still needing to replace it.  I just couldn't swallow another $1K for a new flywheel so chose to go resurface option. 

 

 

Thanks!

Ken 

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