Re: [MBZ] Clutch shudder

[Craig McCluskey]

On Mon, 27 Nov 2006 17:44:09 -0600 Peter Frederick [EMAIL PROTECTED]
wrote:

 You will also need to have the flywheel resurfaced flat.

And the dimension 'a' adjusted to spec.


Craig

[MBZ] Clutch shudder

[Peter Merle]

I decided to drop my gearbox to have a look at the clutch shudder that I
am experience on my 300GD ( OM617 engine with 4 speed manual box ). I
found that the pressure place surace was highly polished and the inner
surface was lower than the outer surface. The flywheel has a 2-3 high
spots. Now what really astounded me was that the distance above the
flywheel surface to which the pressure plate is mounted to ( dimension
a in manual ) is some 3 mm to small indicating that possibly the
pressure plate is exerting too heavier a force on the clutch plate?
Furthur to this when you press the clutch pedal all the  way to the
floor there is a grinding noise where th efork is touching th eback of
the pressure plate. Can this be due to the incorrect dimension 'a'?
Peter

Re: [MBZ] Clutch shudder

[Peter Frederick]

The pressure plate must be dead flat, and yours is conical.

I suspect you will also find that the clutch plate is also both not 
flat and too thin -- if it's shiny, it has been slipping or had gotten 
oil on it from a bad crankshaft or front transmission seal.


I would at the very least replace the clutch plate and pressure plate 
assembly.  You will also need to have the flywheel resurfaced flat.


I suspect you will also find broken springs in the center of the clutch 
plate.


You may need a new pressure plate spring as well, the fingers may have 
lost tension.


Chattering clutch is usually caused by bad pressure plate springs, 
broken internal clutch plate springs, or oil on the clutch plate.  
After it happens for a while, the flywheel will wear unevenly and 
chattering will continue until all surfaces are flat and all the 
springs are good.


Peter