21 21 500 Removing and installing or replacing clutch (SAT 235)
Special tools required:
Necessary preliminary tasks:
Remove transmission. See TRANSMISSION (GS6-53BG) (N18) or TRANSMISSION (GS6X-53BG), WITH N18 ENGINE AND AWD .
Lock flywheel with special tool 11 9 590 .
Observe the following procedure when installing the removed clutch and clutch disc.
Fit special tool 21 2 170 and tighten down at knurled screw (2).
Screw in spindle (3) (approx.6-8 mm) until diaphragm spring (4) is tensioned on stop.
Insert special tool 21 0 010 in recess (1) and disable readjustment of the clutch.
The special tool must remain in the position shown until the clutch is refitted.
Release screws and remove clutch from flywheel.
Installation note:
Clean flywheel and check for wear and damage.
Replace damaged flywheel.
The diaphragm spring tabs of pressure plate can differ in height up to 2 mm when removed.
Do not straighten under any circumstances!
Before reinstallation, used clutch discs are to be cleaned and the grease on hub splines is to be renewed.
The transmission input shaft is to be cleaned but not greased.
New clutch discs are already greased.
Graphic similar.
Check clutch disc for wear.
Measure lining protrusion on transmission side.
Measure from rivet head (1).
The clutch disc must be replaced if the lining protrusion at the rivet head (1) is less than 0.5 mm.
Center clutch disc (1) with special tool 21 0 000 .
Handle clutch disc with care. Do not touch surfaces of friction linings.
Fit clutch (1) to flywheel.
Tighten clutch screws crosswise.
Tightening torque 21 21 5AZ .
Release spindle (1) until load is fully removed from diaphragm spring (2)
Remove special tools 21 2 170 and 21 0 000 .
Withdraw special tool from clutch disc with aid of accompanying screw (1).
Installing new clutch
Vehicles up to model year 02/2013:
When fitting a new clutch, it is imperative that the over-center helper spring of the pedal mechanism is replaced at the same time.
Fit special tool 21 2 170 to pressure plate and tighten at the knurled screw (1).
Screw in spindle (2) approx.10-12 mm) until diaphragm spring (3) is tensioned on stop.
The diaphragm spring must not be pressed too far.
Center clutch disc (1) with special tool 21 0 000 .
Handle clutch disc with care. Do not touch surfaces of friction linings.
Fit the pre-tensioned clutch.
Tighten clutch screws crosswise.
Tightening torque 21 21 5AZ .
Remove special tool 21 2 170 .
Withdraw special tool from clutch disc with aid of accompanying screw (1).