# Oil pump drive chain, replace. S14

Remove splash shield from below front of engine.
Drain engine oil.
Remove the eighteen 10mm bolts from the lower oil pan. |
Remove pan.
Remove timing chain. |
Remove nut from oil pump shaft and remove gear. |
Remove chain. |

### Installation:

Check gears for wear, replace if necessary. |
Tighten chain by increasing or decreasing base shim size until chain has approximately 2mm of movement at the center point between the two gears, with light finger pressure. |
Genuine BMW chains with green marks are longer than chains with red marks. |

###
Part numbers:

Oil pump chain | : | 11 41 1 716 988
Oil pump gear | : | 11 41 1 273 689
Crank gear | : | 11 21 1 308 467
Shim, 0.1mm | : | 11 41 1 250 427
Shim, 0.3mm | : | 11 41 1 250 428

### Torques:

Oil pump gear nut | : | 25 to 30 Nm (18 to 22 ft lbs.)

E30 M3 Repair Manual V2.7. Copyright ©1999-2001 Koala Motorsport & Brett Anderson