Remove timing chain - 11 31 051. Remove oil pan - 11 13 000. Take sprocket (1) off of oil pump. Lift off woodruff key (2) and oil seal (3). Note when fitting: Oil seal (3) can be omitted when installing.
Note when fitting: Adjust chain tension for oil pump drive with shims (1 and 2) so that the chain can be depressed unter slight thumb pressure. Coution! Be careful to install shims (1) with an oil bore correctly. Mount oil pump to holder (3) without tension.