Cummins 6B5.9/6C8.3 Belt Tensioner 3922900 Parts Catalogue Ref No. Part Name Part No. Required 1 Belt Tensioner 3922900 1 Above is the introduction of the Cummins 3922900 Belt Tensioner, while if you need any other Cummins spare parts or complete Cummins engine, Please further consult our sales.