Clutch operation
12-27-2002, 01:36 PM
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Clutch operation
Had a notchy clutch action on my '97 Carrera 4 for a while so had a new Porsche clutch installed.
Was OK for first few miles then notchy action returned.
Another new Porsche clutch was fitted but clutch action is still the same. Dealer who fitted it now claims it was a design fault and all 993s suffer from the problem to some extent!!
Clutch hydraulics all OK so it must be internal.
Anyone else experiencing this fault or do we have a faulty batch of Porsche clutch kits??? <img src="confused.gif" border="0">
Was OK for first few miles then notchy action returned.
Another new Porsche clutch was fitted but clutch action is still the same. Dealer who fitted it now claims it was a design fault and all 993s suffer from the problem to some extent!!
Clutch hydraulics all OK so it must be internal.
Anyone else experiencing this fault or do we have a faulty batch of Porsche clutch kits??? <img src="confused.gif" border="0">
12-27-2002, 01:55 PM
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Sounds like you had a bad clutch slave cylinder (notchy feeling is usually the symptom of a bad clutch slave cylinder) and the dealer misdiagnosed it as being a bad clutch, that's why your problem is still there.
12-27-2002, 01:56 PM
#3
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CW1:
I am not sure what you mean by “notchy” clutch action, but I can think of a few items to look at:
1. If what you are feeling is in the pedal assembly, there is a set screw that adjusts the spring tension applied to the clutch pedal. It is designed to be adjusted to give the same pressure against your foot (shoe) along its entire range of motion. Different clutches have different spring rates and that is why the adjustment is there.
2. On some cars, the clutch slave cylinder should be replaced. This is usually characterized by a loud clicking sound that can easily be heard with the engine off and the clutch pedal depressed and released. It is my experience that all 993s click a little, but when you can feel it as well as hear it, it may be time to replace the slave cylinder. This is a fairly straightforward DIY project that doesn’t require any special tools other than some help bleeding the new slave cylinder.
3. Another issue on 993s is the kinematic lever that is attached to the clutch pedal within the pedal assembly. If memory serves, there are 4 different iterations of this lever starting from 1994. Your car being a ’97 should have the latest lever. I don’t think there is a way to tell which you have without removing the pedal assembly and looking at the part number. Each lever was a different color, but it is very difficult to see into the assembly.
4. Lastly, some of us have had problems with corrosion on the input shaft that the clutch assembly rides on. It doesn’t allow the clutch to slide as freely as it should and makes it difficult to shift the car out of gear when coming to a stop and the clutch pedal doesn’t return completely when you remove your foot. The only fix for this is to remove the transmission and clean the input shaft. That doesn’t sound like your problem.
Hope this is somewhat helpful,
Hank
I am not sure what you mean by “notchy” clutch action, but I can think of a few items to look at:
1. If what you are feeling is in the pedal assembly, there is a set screw that adjusts the spring tension applied to the clutch pedal. It is designed to be adjusted to give the same pressure against your foot (shoe) along its entire range of motion. Different clutches have different spring rates and that is why the adjustment is there.
2. On some cars, the clutch slave cylinder should be replaced. This is usually characterized by a loud clicking sound that can easily be heard with the engine off and the clutch pedal depressed and released. It is my experience that all 993s click a little, but when you can feel it as well as hear it, it may be time to replace the slave cylinder. This is a fairly straightforward DIY project that doesn’t require any special tools other than some help bleeding the new slave cylinder.
3. Another issue on 993s is the kinematic lever that is attached to the clutch pedal within the pedal assembly. If memory serves, there are 4 different iterations of this lever starting from 1994. Your car being a ’97 should have the latest lever. I don’t think there is a way to tell which you have without removing the pedal assembly and looking at the part number. Each lever was a different color, but it is very difficult to see into the assembly.
4. Lastly, some of us have had problems with corrosion on the input shaft that the clutch assembly rides on. It doesn’t allow the clutch to slide as freely as it should and makes it difficult to shift the car out of gear when coming to a stop and the clutch pedal doesn’t return completely when you remove your foot. The only fix for this is to remove the transmission and clean the input shaft. That doesn’t sound like your problem.
Hope this is somewhat helpful,
Hank
12-27-2002, 02:15 PM
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Thanks Hank,
'Notchy action'is a noise and a feeling through the pedal when the clutch is depressed, not released, worse when warm, almost negligable when cold.
I actually own a garage, so will get one of the mechanics to fit a new slave cylinder, after being assured that the noise was a 'factory fitted fault' by a Porsche specalist who fitted the clutches.
One lives and learns!!
Chris Wislon
'Notchy action'is a noise and a feeling through the pedal when the clutch is depressed, not released, worse when warm, almost negligable when cold.
I actually own a garage, so will get one of the mechanics to fit a new slave cylinder, after being assured that the noise was a 'factory fitted fault' by a Porsche specalist who fitted the clutches.
One lives and learns!!
Chris Wislon
12-28-2002, 11:48 AM
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Rennlist Member
I have had the clicking sound 2 or 3 times in the 5 years I have owned this car. It occured when I release the pedal, more so when quickly released, usually not at all when slowly released. Each time the independent mechanic said it was not the slave cylinder. It lasted for a couple hundred miles, then went away as he predicted, most recently this month. The first time it happened, the clicking appeared to come from the rear of the car. This month's episode seemed to come from just under the driver's floorboard. I replaced the clutch/FW at 73K. I wonder if it is the spring tension adjustment or the kinematic lever. Next time if it got bad or did not go away after a couple hundred miles, I will replace the slave cylinder.
