924Board.org

mhart · Joined: 24 Feb 2006 Posts: 170 Location: New York, NY

so last saturday, my clutch basically stopped working right. At first I had trouble shifting, then I had trouble revving over 3k rpms. So I took the car in to the shop today to get it looked at, and was talking to the guy and he said he thought it sounded like I probably just had a bad slave cylinder, not a bad clutch disc/plate combo like I had originally thought! So for the next day or so, i'm going to be keeping my fingers crossed while they check it out to be sure - with any luck I'll be able to dodge the whole new clutch bullet (which is good because even if i had the time to do a clutch install, I don't have the facilities...)

Just thought I'd share
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'87 924 S - No sunroof and a few modifications

Slam · Posted: Fri Aug 04, 2006 3:13 am Post subject:

What exactly were the sypmtoms? If the clutch failed to completely disengage on a shift or the pedal went to the floor and stayed there, then yes, the slave may be the problem. But I've had three go out on me in the 13 years I've owned the car and not once have they affected RPM.
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'88 944 Auto - may or may not resurrect

mhart · Joined: 24 Feb 2006 Posts: 170 Location: New York, NY

yeah...the clutch pedal started feeling a little soft, then i was shifting and the car wouldn't go back into gear. I had to pull over and pump the clutch a few times to get it to shift, and after that, it would shift, but the shifting was balky and it wouldn't rev over 3k in gear. The slave makes sense to me because its not pushing or pulling enough pressure to either completely engage or disengage the clutch. It could be that i'll need a new clutch soon too and that problem was exacerbated by the bad slave cylinder, but I guess we'll know for sure soon what the deal is
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'87 924 S - No sunroof and a few modifications

Lizard · Posted: Fri Aug 04, 2006 7:44 am Post subject:

I have to say that the shifting does sound like a disenagagement issue meaning either air in the system, or a defective master of slave cylinder, however regardless of that fact the clutch will not prevent you from being able to rev over 3k
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3 928s,

mhart · Joined: 24 Feb 2006 Posts: 170 Location: New York, NY

no, the car will rev over 3k, it just shakes like hell if you try to do that in gear
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'87 924 S - No sunroof and a few modifications

Lizard · Posted: Fri Aug 04, 2006 9:57 am Post subject:

that could be the clutch disc skipping, but unlikely that it would be RPM dependant, it would be more load dependant, ie 5th gear 50kmph
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3 928s,

mhart · Joined: 24 Feb 2006 Posts: 170 Location: New York, NY

are you sure? I would've thought clutch slipping would definitely be rpm dependent....the engine makes more power up top, which puts more force on the clutch and therefore requires greater clamping force. I would think it would make sense that a car with a slipping clutch could drive fine at a given speed in 4th whereas the same speed in 3rd would cause all sorts of clutch slipping - the lower gear would create more resistance to rotation adn the engine would be rotating the torque tube with greater power, so in conclusion, the clutch experiences greater rotational forces and if the master or slave is shot, begins slipping, sometimes violently
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'87 924 S - No sunroof and a few modifications

Slam · Posted: Fri Aug 04, 2006 11:55 am Post subject:

If you have the original rubber-centred clutch then yeah, it can cause all kinds of vibrations as it fails and the rubber breaks up. You may need to do a complete clutch R&R. Pilot bearing too.
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'88 944 Auto - may or may not resurrect

mhart · Joined: 24 Feb 2006 Posts: 170 Location: New York, NY

I think the previous owner said he replaced the clutch within the last 50,000 miles (he claims that translates to like 6-7 years ago) so it should be a spring type....but who knows with this guy

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'87 924 S - No sunroof and a few modifications

Lizard · Posted: Fri Aug 04, 2006 9:30 pm Post subject:

the clutch slipping will be load dependant, not RPM dependant, the greater the load the more load the clutch sees, and then the more likely it is to slip, you will rarely slip in 1st gear.
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3 928s,

mhart · Joined: 24 Feb 2006 Posts: 170 Location: New York, NY

Well I talked to the mechanics on friday, and it looks like the clutch is definitely fried too...it really sucked because I was kinda happy that my problems could be resolved by a cheap slave cylinder, then I found out it was the clutch. I was just chatting with the manager of the shop I go to and he guestimated the cost to like a grand, so I thought "ok that sucks, but its not as bad as I initially though", but then he gave me the final number of $1400 or so and i was kinda upset/sad/frustrated. I'm going to do it because I don't want to give up on this car, but it just kinda sucks

as I keep telling myself though, for everything that breaks, I'm getting it fixed right, and so I'll get many years of (relatively) trouble-free enjoyment once I finish undoing years of PO neglect and screwup
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'87 924 S - No sunroof and a few modifications