993 clutch/flywheel problems

naro914 · 02-22-2005, 04:40 PM

Ok, I am not a mechanic so I figure there's got to be someone that knows better than me.

I have been told by a couple potential buyers that 993's have clutch and/or flywheel problems. Does anyone know what they are talking about?

I personally own a '95 993 cab with 121k miles, and it still has the original clutch and flywheel, so I don't really see there being an issue. Plus, we have sold a dozen or so 993's in the past year and never had that question raised before....

I know the 993 has a dual mass flywheel, and I know the early 964's had some issues, but know nothing about the 993's

help, if anyone has any real knowledge here.

thanks

AFJuvat · 02-22-2005, 06:33 PM

The 964s had a problem until the dual mass flywheel was changed to the LUK flywheel.

No real problems that I've seen with 993 clutches.

the 993TT does have a problem with the transmission u=input shaft bearings (1996 only)

AFJuvat

naro914 · 02-22-2005, 06:49 PM

That's what I thought...thanks

rcwaldo · 02-24-2005, 11:38 AM

Quote:

Originally posted by AFJuvat
The 964s had a problem until the dual mass flywheel was changed to the LUK flywheel.

No real problems that I've seen with 993 clutches.

the 993TT does have a problem with the transmission u=input shaft bearings (1996 only)

AFJuvat

The 96TT also suffers from bent input shafts, which were strengthened for the 1997 model year..

Chris

hkspwrsche · 02-25-2005, 12:12 PM

I see a lot of 993's at around 70k miles that have had the clutch replaced. Sounds like you've gotten above avaerage wear out of yours.

Rick Lee · Rick Lee's Garage

I agree with Harold. Your clutch/flywheel owe you nothing now. DMF's do develop play, regardless of manufacture year. Some worse than others, but they will all fail eventually. Replacement DMF's are no better than the originals and they ain't cheap. A lot of folks upgrade to a lightweight flywheel and RS clutch, which is no more expensive than replacing eveything with stock parts, but gives a much better throttle response. I just threw this kit onto mine, but haven't gotten the car back yet to test.

naro914 · 03-08-2005, 01:36 PM

Rick,
A friend of mine here has the lightweight flywheel and loves it. Unfortunately, I've heard that the 95's might not be able to accept them because the engine managment can't catch up with the lack of mass when you come to a stop. 96's and up are ok though...

cowtown · 03-08-2005, 03:37 PM

I put the lightweight flywheel and clutch pack in my '95 about 2 months ago. You can either modify the ISV (see the writeup on p-car.com) and then set the idle a bit higher (850 or so), or change the chip. I modified the ISV. I have a bit of cold surging but it's not bad.

The lightweight setup is very nice. The dual mass was failing when I bought my car, however, so I don't really have a before-and-after perspective.

I have heard that Andial sells a "mid-weight" flywheel that's good for the '95s. I personally don't see the point, but it's an option if you don't want to go all the way.

naro914 · 03-08-2005, 04:11 PM

Colin,
thanks...I'll keep that in mind if we ever need a new clutch, we'll do it all at the same time.
However, from the comment my mechanic made about our current clutch, we may never need to do it... :-)

BudTaylorUS · 07-27-2005, 12:19 PM

I have a 90 with the original flywheel and am looking to upgrade to the LUK. Does anyone have the part numbers or should I just ask fopr a flywheel that fits in a 92 to 94 ?

Britwrench · 07-27-2005, 12:23 PM

There is only one DMF available nowadays for 964 models so you will get the LUK version. Make sure you replace the clutch release lever, shaft, bearings and seals at the same time.

BudTaylorUS · 07-27-2005, 12:41 PM

what are you thoughts on turning the original....the car has 32 K and it certainly does not feel near failure yet. I just get a breif hesitation everynow and again engaging first.

Rick Lee · Rick Lee's Garage

Why mess with the original? Make a paperweight out of it. Getting to it is a lot of work for an experiment. Go LWF!

BudTaylorUS · 07-28-2005, 05:36 AM

I have heard the LWF has stalling issues for daily driving. I sthis unfounded...I use my car on the street not track .

Rick Lee · Rick Lee's Garage

Never stalled once with LWF and my 993 is now street only.

BudTaylorUS · 07-28-2005, 06:37 AM

which brand/supplier did you use and did you have to put in a new chip (if so which one) P.S. I have a 964 I wonder if it is the same ?

Rick Lee · Rick Lee's Garage

I have a '96 993 C2, so the computer takes care of this on its own. I don't know the brand of the flywheel - probably generic. Entire Sachs RS clutch kit, LWF and hardware ran me around $1200 delivered.

kang · 07-28-2005, 07:55 AM

One con to light weight flywheels that’s not often mentioned is the lack of smoothness at low speeds. The heavier flywheel has more inertia, so as you feather the gas in low speed situations, the inertia smoothes things out a bit. With a lighter flywheel, you loose some of this smoothness. Of course, this depends on how light you go, how the computer accommodates the flywheel, etc, etc. But it is something to consider. If you spend a lot of time in traffic, it can be an issue. If you are mostly at higher speeds, it’s not that big of a deal. Some track only cars have really light flywheels, like less than 5 lbs, and they have a hard time in the garage areas, etc. Drivers give the car a little gas, then coast, then repeat.

cstreit · cstreit's Garage

What are the symptoms of a failing DMF?

I just picked up a 96 and I know it's got the original clutch in it...

BudTaylorUS · 07-31-2005, 08:23 AM

Well not sure about others symptoms but with mine sometimes there is a breif hesitaiton in first if you do not get the gas just right. It is my understandiong that the problem was fixed in 1991.