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Clutch judder?

RSGulp

RSGulp

PCGB Member
Member
Recently, on several occasions after a run in the SC and everything is nicely warmed up, if I try to pull away in first gear it feels like the back of the car is going to shake itself to pieces. It literally feels like the engine and gearbox are shaking up and down and moving the entire car.

I can only assume it's time for a new clutch and/or release bearing. I've had the car up on ramps and the enginee and gearbox mounts look okay.

Any thoughts?
 
The clutches on these cars seem to celebrate their 30th (approx) birthday by falling apart. it is the pressure plate/ diaphram spring that rusts over the years. If this is the problem the next step is that it will go bang and you will have no clutch. This happened to me in the Isle of Man in 2000 just as I was going to the harbour at 5am to greet 243 Porsches arriving for our first Manx Tour.
Bite the bullet and get it done.
 
Clutch now replaced and the 'fast launch' is how it should be again. I also had the flywheel 'skimmed' while the engine was out to remove any undue vibration.

Interestingly, one side of the rear engine mounting had broken - not sure which came first though, the clutch judder causing the mount to break, or the broken mount causing the judder.
 
I had a failed engine mount and clutch at the same time as well!

Have you been advised that the flywheel/ new clutch will need to bed-in? Mine took about 12 months as the flywheel skim was perhaps not 100% true and equally keyed in.

[:D]
 
Jerry,

No, I wasn't advised to bed-in the clutch. Is there anything you would suggest in terms of 'driving style' to maximise the life of the new clutch? Or is it a case of just drive normally?

Rich
 
The last one lasted 22 years. How long will you have the car .. Realisticly???
Click to expand...

Geoff, I wouldn't have thought the clutch I've just replaced was the original fitted 22 years ago?

What i mean is, is there a 'running in' period for a brand new clutch. Is it necessary to take it easy for the first 500 or 1000 miles, or is it just a case of drive normally (eg. like a complete loon)?
 
Hi Rich

Hmm, I reckon my car has had more than one clutch overhaul of one kind or another in the last 23 years... anyway moving on.

Beddding in - as far as I understand it the aim is to get the flywheel and clutch disc to bed-in. Within the tolerances for the two surfacaes you can get high spots which on the flywheel appear polished and smooth - these lack friction and cause a small degree of vibration which can sometimes be felt as judder. It is no doubt variable per car/ assembly/ kit. JZ told me to expect 12 months (low mileage) for it to fully bed-in and perform to it's optimum

Normal driving is just the ticket - not slipping the clutch for normal gear changes plus lower revs when parking , hill starting etc to avoid polishing the high spots further. Of course high spots on the flywheel wear the friction surface of the clutch disc.



 
Just the advice I was after - to be honest common sense told me not to thrash the car hard for the first few thousand miles just like when replacing other friction surfaces such as brake discs and pads.

Thanks for the advice Jerry.
 
When you buy a new car it's advisable to have a 'running period' to ease major components into a long and reliable life, it's the same for a new clutch, it's a major component, treat it with respect for a while and it will pay dividends with another long period of service.
 
ORIGINAL: Rich Claridge

Recently, on several occasions after a run in the SC and everything is nicely warmed up, if I try to pull away in first gear it feels like the back of the car is going to shake itself to pieces. It literally feels like the engine and gearbox are shaking up and down and moving the entire car.

I can only assume it's time for a new clutch and/or release bearing. I've had the car up on ramps and the enginee and gearbox mounts look okay.

Any thoughts?
Click to expand...

I'm sure it's a simple clutch adjustment about ten minute job on stands.........
 
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