2. Remove the protective cover of the oil pump sprocket, for which, depending on the version, unscrew the bolts that secure it, or release the cover from the clamps.
3. Loosen the nut and remove the sprocket with the chain.
4. Unscrew the pump mounting bolts and remove it.
5. If necessary, compress the retaining split ring and remove the pressure reducing valve.
6. Installation is carried out in the reverse order. Adjust the chain tension to the value A = 10±2 mm, turning the threaded sleeve in the oil pump with a rod wrench.
[Original publication posted on the website BMWman]