Our 300sdl's belt is squeaking even though it is new. The fixed pully, in the middle where the belt is upside down, teeth facing out, looks like it has a worn bearing and is cocked down. The belt is about 5mm off the pully towards the radiator.

Is it fairly easy to replace the pully or could it be something else.

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Thanks,
Will

1985 300D- 222k- (bad transmission)
1980 300D- (parts car)
1982 300SD- 242k