Auxiliary Drive Belt Tensioner

The MINI COOPER uses a torsional spring to apply load to the belt and a friction damper to reduce the pulsating vibrations from the engine.

Fig 1: MINI COOPER Belt Tensioner

Courtesy of BMW OF NORTH AMERICA, INC.

Workshop Hint 

Auxiliary belt should be replaced at 100,000 Miles on MINI COOPER and 60,000 Miles on Cooper S. Always refer to the .

Fig 2: MINI COOPER S Belt Tensioner

Courtesy of BMW OF NORTH AMERICA, INC.

The MINI COOPER S Spring travel stop uses a compression spring to apply to load to the belt and a hydraulic damper to control the engine pulsation.