Hi all,

I own a 1.9 JTD Stilo, 5 doors. About 600 miles ago I changed the clutch kit (disk, plate and the pressure bearing) and also the brake fluid.
After this job I noticed a vibration whenever I would press the clutch and the rpm were over 2000. If I press the clutch pedal below 2000 rpms there are no vibrations in the pedal, but over 2000 rpms (more exactly when the turbine kicks in) it happens. The vibrations (to try and give a more precise explication about how it feels) feel like something rubbing at high speed and putting resistance, they are small in intensity but very high frequency, like you can feel the disk pressing against the plate (i think this is what happens when you engage the clutch).
Going into gears, changing and releasing gears is working fine, didn't notice any issues there.
But this high friction vibrations are killing me.
Hope someone can give a hint about this.
Thanks

Today I noticed that the vibrations feel more when the car has run for some time.
When I started the car this morning and drove of, the clutch felt right, no noticeable vibrations, but after some time it felt like the clutch hardened a little and then the vibrations started to appear.

Try a Google search (or a Search on this Forum) for Dual Mass Flywheel faults, see if they seem to match your experience.

I had the flywheel checked when i changed the clutch kit and it is in good condition, the mechanic told me it's not worth changing as it looks good an most probably when i do the next clutch change i should consider it.
I have checked all there is to check on flywheel symptoms and nothing comes close to this.
The vibrations appear only while pushing the clutch pedal. When the pedal is fully pressed there are no vibrations, when it is fully released no vibrations, only at about half it's course i can feel this vibrations.

If you have no vibrations with clutch fully up or clutch fully down and it's just on clutch bite or clutch take up then you may have contamination on the clutch plate

what do you mean by contamination? the clutch kit is brand new, not second hand, so i assume it should be clean? if you are referring to some dirt shouldn't that have gone by now? from all the friction i'm thinking it should have been removed.
btw, do you think it could be the clutch pump (the part under the pedal)? what are the symptoms of a bad one?

When people are installing a new clutch they sometimes get their oily hands on the plate
Or a crankcase oil seal leak

More people with DMFs replace the flywheel at the same time when they are installing a new clutch. Pretty horrific price I know

A clutch pump (master cylinder) leaking will tend to give you low bite, difficulty engaging gears, gear crunching etc

not really sure that this is the cause. the mechanic even washed the inside of the gear box because it was black from all the dust/oil vapors and so on, so i don't see why he would have handled the clutch differently. Also the vibrations only happen after the car warms up. when i start it in the morning and it's still cold and also cold outside the vibrations don't appear.

warped flywheel/clutch components, although u say the clutch has just been done i would doubt it to be this if your mechanic has taken the care you describe when fitting... my money is on your DMF purely because you've had a new clutch and the DMFs are known to fail (even if they appear good)

Some people just dont want to hear it but :-
"Dual Mass Flywheel repair and replacement
Even if a dual-mass flywheel does not experience a spring failure, the service life of most OEM dual-mass flywheels is typically about the same as the clutch, which means the flywheel usually needs to be replaced when the clutch wears out. If you simply bolt in a new clutch, chances are your customer will have flywheel problems at some point down the road because of the weakened springs in the flywheel. That’s why many experts recommend replacing a dual-mass flywheel when changing a clutch — especially if the flywheel has more than 80,000 or 90,000 miles on it. The flywheel should be considered a wear item just like the clutch, and should be replaced when a new clutch is installed."

*facepalm*

SMF conversion is the option

If it was my car Richy I'd have it back at the place that did the clutch TBH...

DMF failure can have many different symptoms, I'd love to know how the OP's mechanic tested it, there are specific tests but they need specific DMF test kit.

at the risk of nipping this in the bud i seem to remember a DMF/SMF pros and cons thread not so long ago. here

altho i am not aware of specific test kit for DMFs i know that they can fail without showing any symptoms visually

http://www.apsw.co.uk/index.php/Damping/dual-mass-flywheel-pre-fitting-checks

http://www.schaeffler-aftermarket.c...es_luk_as/special_tools/zmstool/zmstool_1.jsp

John