Removal
1. Remove the gearbox.
2. Loosen the clutch pressure plate mounting bolts one by one by 1–1.5 turns until the pressure plate is loosened.
Caution: If the mounting bolts are immediately unscrewed completely, the disc spring may be damaged.
3. To prevent the flywheel from turning while loosening the bolts, lock it with a screwdriver.
4. After this, completely unscrew the bolts.
5. Remove the pressure plate and clutch disc.
Caution: When removing them, do not drop them, otherwise after assembly there may be difficulties associated with jerking and disengaging the clutch.
6. Blow out the inside of the flywheel with compressed air or wipe it with a rag soaked in gasoline.
Examination
1. Check the clutch pressure plate for cracks, burns and scratches.
2. Inspect the disc spring for cracks.
3. Check the disc spring protrusions (arrows) for wear and uniformity of height; if necessary, carefully align them with pliers.
Please note: Wear may be up to 0.3mm.
4. Check the flywheel for cracks, burns and scratches.
5. Sand the clutch pressure plate with coarse sandpaper.
6. Replace oily, grease-smeared or mechanically damaged clutch discs.
7. Measure the thickness of the clutch disc linings. New: 3.6-4.0 mm on each side of the lining. If the wear limit of 2.6-3.0 mm on each side of the friction lining has already been reached, replace the clutch disc. Do the same if there are cracks on the friction linings.
8. Check the lock bolts, shock absorber windows, torsion springs and bushing (arrows) for signs of wear and grinding.
9. Remove and inspect the clutch release bearing from the tubular support on the front transmission cover.
10. The clutch disc can be checked for runout at a car repair shop. The lateral runout of the clutch disc can be a maximum of 0.5 mm.
Caution: This check is only required if the old clutch disc needs to be reinstalled and the clutch has previously not disengaged correctly.
Installation
1. Place the clutch disc and pressure plate on the flywheel and centre them using the connecting rod or the HAZET 2174 centring tool.
Please note! In engines with a twin-housing flywheel, the clutch disc toothed ring is permeated and therefore does not require lubrication.
[Read more on the website: MercedesMan]
2. Tighten the mounting bolts to the clutch pressure plate one by one in increments of 1–1.5 turns until the pressure plate is securely fastened. Tightening torque: 25 N·m. Then remove the center mandrel.
Caution! Make sure that when tightening the bolts, the pressure plate is pulled into the flywheel evenly and without burrs.
3. Install the gearbox.