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could be the bearings within the superchargerHi All,
We have just bought a 2005 SLK 200 which has developed an annoying whine from the engine. We have run the engine without the fan belt and the whine still occurs, could it be the supercharger ?
My supercharger seems to whine a little when cold and then it quietens down although it's always there to some extent when the engine is under load. The pulley is always driven but recent superchargers have a clutch which engages drive to supercharger only when boost is required. Judging by the torque available I'm pretty sure mine engages a fair bit lower than 1800 RPM but I guess it would always be disengaged at idle and also at a steady cruise.
There is no service interval specified for supercharger maintenance however the oil can and probably should be changed on a high mileage car.
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