Clutch replacement.

Emtee

Emtee

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Dave said:
I've had no vibration although it does "rattle" from cold while I close the garage door. If I open the drivers door and listen the noise stops when I depress the clutch ie prop stops turning....maybe the support bearing in the bell housing is grumbling a bit ?
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Dave, Many thanks for this. I've been told dry sump engines can rattle from cold as the oil gets up into the engine, but I have just the symptoms as you describe and you've opened up another possible cause. Definitely worth further comment. Sympton - excessive engine rattle from cold. Possible cause - worn bell-house bearing. Anyone care to comment? Cheers, Miles.
 
safrane

safrane

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Hmmm ok...thought is wa only D/L who were edited. Anyway a car I recomended to a guy was inspected after he bought it [daft I know, horses and gates etc]

Well it came back with a good report, except that the cluch judder was due to it not being ballanced!
 
D

Dave

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It's not the engine that rattles it's the prop shaft spinning - hence it stops spinning when the clutch is depressed. Engine is totally rattle free. Unfortunately I can't tell whether prop shaft rattles when the car is moving as I have to open the door and lean out to hear anything.....not recommended!!!! PS Don't believe clutch judder is caused by an imbalance more likely to be warped diaphragm or knackered engine mounts
 
conaero

conaero

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Just heard back from my other mole and this one has come back as yes, they do balance it.
 
Emtee

Emtee

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And so it goes on..........

I Spoke to Darren at Graypaul Nottingham today to get a quote for my clutch replacement as I'm shopping around a bit before committing and managed (I think) to steer the conversation so that he didn't feel like he was letting any trade secrets out of the bag.

Do Graypaul Nottingham balance clutches? - Darren said not.
 
NickP

NickP

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OK. So the 4200 clutch doesn't sound like something you'd want to do at home, is this the same for replacing a 3200GT clutch? No wear sensors on a 3200GT so I guess its different?

On a side note, when I bought the car the guy told me the gearbox was the same as an M3, which would infer the clutch would also be the same? Sounds like a load of nonsense to me but anyone know for sure?
 
conaero

conaero

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Nick, I have heard that too, but not sure. I know the Maserati use Gertrag gearboxes, they are german and also used in BMW.
 
Emtee

Emtee

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So following a quick visit to Graypaul this morning to get my clutch checked - a perhaps deceptively simple question if I may?

What is the difference between PIS (Point of Initial Slippage) and KIS (kiss?) exactly?

Here's what I think I know (but am happy to be corrected if I'm wrong)...

PIS - this is the set distance between clutch and flywheel when dis-engaged. The range seems to be between 4.8mm and 5.2mm. Once set it self-adjusts as the clutch wears, but to do so accurately the car must be told that a new clutch has been fitted and therefore a new datum set. It is this that then gives the wear reading shown as a percentage on the SD2.

KIS - Not a clue! I have been told that it is only on facelift 4200's (MY'05 onwards) and GS's? I have also been told that this is not set as such, as it is self learning within the ECU programming.

Would be very interested to hear the truth of it all?

Cheers, Miles.
 
ENZ525

ENZ525

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Hi Miles,
Not sure if this helps really,
but in the technical help guides I use,there is no mention of KIS, only PIS,
Regards,
Enzo.
 
Emtee

Emtee

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Thanks Enzo, I can see why this would be as it is the PIS that is set, but sometimes it's mistakenly referred to as the 'kiss' point, which just confuses things even more.

I know the KIS setting exits, would just like to know what it is so that main dealer grease monkeys don't try to get one over on me.

See you tomorrow! Can't wait. :)

Cheers, Miles.
 
ENZ525

ENZ525

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Emtee said:
Thanks Enzo, I can see why this would be as it is the PIS that is set, but sometimes it's mistakenly referred to as the 'kiss' point, which just confuses things even more.

I know the KIS setting exits, would just like to know what it is so that main dealer grease monkeys don't try to get one over on me.

See you tomorrow! Can't wait. :)

Cheers, Miles.
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Hi Miles,
I think they may be the same thing...havn't read the whole piece,
but take a look at this PDF, it is from a patent that was filed for an invention relating to clutch calibration and in particular the kiss-point,
Regards,
Enzo.

http://www.freepatentsonline.com/6086514.pdf
 
Emtee

Emtee

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8,446
Additionally, towards the end of the clutch's life, rather than relying on the wear reading, which will a vague guide at best, the SD2 can also give a clutch glaze reading..ie.. amount of slippage. A reading of 10,000 (don't know what of) is standard for a clutch in good condition. Sadly mine gave a reading of 64,000!
 
ENZ525

ENZ525

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Emtee said:
Additionally, towards the end of the clutch's life, rather than relying on the wear reading, which will a vague guide at best, the SD2 can also give a clutch glaze reading..ie.. amount of slippage. A reading of 10,000 (don't know what of) is standard for a clutch in good condition. Sadly mine gave a reading of 64,000!
Click to expand...

Miles, hope you don't mind me asking,
but does the 64,000 mean that you need to change it now...or did they give any indication at which point it has to be done, ie can it get to 100,000,
I guess it is still quite a subjective number, right?
 
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