Mini Cooper S 2006 - Belt Tensioner Replacement

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Replacing a failed belt tensioner in a Mini Cooper S 2006 - R53 without lifting or droping the engine. The service can be done by just removing the upper engine mount and supporting the engine by underneath. The belt tensioner was removed by the side in between the engine and the engine bay frame.
The tensioner is hold by 4 bolts: M16x70mm, M16x50mm and 2xM10x35mm. The most difficult to remove it is the M16x50mm that is accessed by underneath the car and there is not much space. You need to be patient and use a long wrench.
Size of serpentine Belt for Mini Cooper S 2006
This is OEM belt size for Mini Cooper S 2006 R53 prod. 10/2005:13.88mm 6PK1388
This is the OEM size for Mini Cooper JCW: 13.74mm 6PK1374
I use on Mini Cooper S 2006 a 15% reduction pulley. The belt that fits perfect is:
13.60 mm (NAPA 25-K060535 or BANDO 6PK1360)
I already have used both but by the construction and material I prefer BANDO.