Mercedes-Benz W204 clutch and dual-mass flywheel

The cause is often the dual-mass flywheel or the release bearing. A broken dual-mass flywheel can let grease onto the clutch disc, so the disc burns and the clutch slips. The clutch has no valve, and the fault is usually only confirmed when the gearbox is removed.

You need a clutch kit, a flywheel, a flywheel bolt set and a release bearing. Consider replacing the crankshaft seal at the same time. The clutch size and pressure settings must match the engine version, so check the parts against the car's details.

With new bolts the torque is 45 Nm followed by 90 degrees. The figure is given for the OM646 and OM651 engines. Fitting a self-adjusting clutch without a special tool can damage the clutch, so the job is best left to a workshop.