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Helpful ReplyHot!new clutch but still very heavy?

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gaz350
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2019/09/10 09:06:15 (permalink)

new clutch but still very heavy?

hi , ive just had a new clutch fitted as the pedal was incredibly stiff , (only purchased a couple of months ago) it drove fine with no slipping but so hard!
anyway it now has a strong springback on the pedal and is definitely lighter, but still really heavy.
is this normal on a cs?
my mechanic did tell me the adjustment had been loosened right off previously, i presume as it was so stiff, so he adjusted it until he got a good pedal.
he has never done a clutch an a 968 either 
i know its hard to compare to any other vehicle, but it is the heaviest pedal ive ever driven
any advice would be helpfull
thank you
gaz
 
  
ExAudiSi
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Re: new clutch but still very heavy? 2019/09/10 09:51:07 (permalink)
Doesn't sound right to me.
Mine isn't a CS, but as far as I know the clutches are all the same. Mine was lighter after the clutch was changed. Although there are different pressure plates meant for a 911 (964?) which fit but are stiffer.
Are you missing the over centre spring on the pedal?
I'm not sure if there is any adjustment on the clutch itself, only on the pedal height and this is supposed to be adjusted to a set dimension given in the manual.
Waylander
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Re: new clutch but still very heavy? 2019/09/10 09:52:26 (permalink)
Hi Gaz
 
If it was not a genuine clutch its possible that you have been supplied the pressure plate for any 911 up to the 964 turbo as they all fit, the only difference is the clamping force
 
The 968 workshop manual has a page regarding the identification of the pressure plates between the 968, 964 and 993 with color markings; a smear of color on the outer side just above the "fingers." Green for the 968, blue for the 964 Carrera 2/4 and a red streak for 964 3.6 Turbo — the 993 has no colour marking. It doesn't take a propeller head to figure out that any of these 240mm pressure plates are interchangeable between the models.
 
In Porsche's 1992 Service Information Technik for the 968, a factory service information manual, section 3-10 goes into detail regarding the pressure plate. It states that the clamping force of the 968 clutch is between 8,800-9,600 N (Newtons), which is equivalent to 1,978-2,158 lbf (pound-force) , and there is no difference for a coupe or clubsport they are all the same clutch plate
 
the 964 2/4 take the same size plate and can be in a Sachs or Luk box for a 968 as they don't really make the distinction, this plate has a clamp force of 50% more 3,300 lbs, this makes the clutch incredibly heavy and no amount of adjustment or springs will help
 
and of course the only way to find out what you have is to take it back out again,
 
the genuine pressure plate you require is 964 116 027 90, PET offers two alternative to this number, 
964 116 027 01
964 116 028 00
 
both of these have been superseded to the first number 
 
 
 
 
 
 
 
post edited by Waylander - 2019/09/10 09:57:50

1992 Cobalt Blue 968 Coupe
Waylander
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Re: new clutch but still very heavy? 2019/09/10 10:08:18 (permalink)
I can provide the dimensions for you to give to your mechanic that shows how to set the pedal up,
 
this needs to be correct or you can get into a situation where the pedal goes to the floor and stays there, 

1992 Cobalt Blue 968 Coupe
gaz350
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Re: new clutch but still very heavy? 2019/09/10 10:16:44 (permalink)
thanks for the replies, the clutch kit was from BMS superfactors, SAC3000951767, thats all i have
now way of knowing now i guess, i will give my mechanic a call to see if he remembers any colour smear, long shot i know
not sure what to do now really!
 
gaz350
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Re: new clutch but still very heavy? 2019/09/10 10:26:19 (permalink)
that would be very helpfull thank you waylander
Waylander
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Re: new clutch but still very heavy? 2019/09/10 10:52:18 (permalink)
Duplicate post
post edited by Waylander - 2019/09/10 11:01:59

1992 Cobalt Blue 968 Coupe
Waylander
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Re: new clutch but still very heavy? 2019/09/10 10:52:18 (permalink)
That part number is a Sachs Kit, so its a fairly good bet that its a 964 plate, it is the correct part number from the Sachs Catalogue the problem is they use a one fits all type policy
 


 
 
 

1992 Cobalt Blue 968 Coupe
Waylander
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Re: new clutch but still very heavy? 2019/09/10 11:01:19 (permalink) ☄ Helpfulby gaz350 2019/09/10 13:01:37
I would also add, that 9 times out of 10 the pivot bar and the needle rollers in the release fork need changing too as they get very pitted,
 
I would have changed the Pilot bearing and checked the RMS while there, as its a pain to have to do it twice,
if you are local your welcome to come and drive mine for comparison 
 
I'm right by J26 M25
 
post edited by Waylander - 2019/09/10 11:03:26

1992 Cobalt Blue 968 Coupe
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