Hello Motor-Talkler, who knows this: Investigating object: A W124 (E 200 Diesel), 2 liters with 75 hp, built in 1995, manual 5-speed manual transmission and 160,000 km on the clock. Note: I had recently confirmed from a workshop that the backlog “is no longer quite in order”. (Symptoms: In idle noises, I step the clutch pedal disappears.) Question: In addition to the noise of the backlog, which disappears again when the clutch pedal enters, another noise constantly runs in idle. I believe it has also occurred at the same time as the problem of the backlog. The noise is a dull tone, which strikes in the cycle of crankshaft rotations. If the engine hood is opened, this noise does not seem to come directly from the engine, which runs very clean, as always. Can this sound come from the gearbox??? Does anyone know this problem? Is it a problem at all?