The S85 Oil Pump is chain driven from the VANOS High Pressure Pump. The drive chain has a stationary and tensioning guide which wear over the life of the engine. It is prudent preventive maintenance to replace the chain guides and tensioning spring if you are already in the oil pan for other maintenance.
The following parts are included:
- 1) Oil Pump Drive Chain Tensioning Spring 11 41 7 835 445
- 1) Oil Pump Drive Chain Stationary Guide 11 41 7 837 576
- 1) Oil Pump Drive Chain Tensioning Guide 11 41 7 835 156