REMOVAL & INSTALLATION
Except 325 Series, 524td, 528e,1600, 2000, 2002 and M3 Models
- Remove the oil pan. On the 318i and M3, only the lower section of the pan need be removed.
- Remove the bolts retaining the sprocket to the oil pump shaft and remove the sprocket.
On 4-cylinder engines:
- Remove the oil pump retaining bolts and lower the oil pump from the engine block.
- Check the installed location of the O-ring seal, between the housing and the pressure safety line and make sure it is installed so it will seal properly.
- Tighten the sprocket retaining nut to 18-22 ft. lbs. (23-29 Nm).
- Be sure that the oil bore in the shim(s) is correctly positioned during the oil pump installation. If there is a lot of play in the drive chain, add one or more shims. The drive chain should give slightly under light thumb pressure.
On 6-cylinder engines:
- Remove the oil pump retaining bolts and lower the oil pump from the engine block. On 6-cylinder. engines, there are 3 bolts at the front and 2 bolts attaching the rear of the oil pickup to the lower end of a support bracket. It is necessary to remove all 5 bolts.
- Do not loosen the chain adjusting shims from the 2 mounting locations.
- Add or subtract shims between the oil pump body and the engine block to obtain a slight movement of the chain under light thumb pressure.
- Install the oil pump in the reverse order of removal. Tighten the bolts to 16 ft. lbs. (21 Nm).
- On 6-cylinder engines, after the main pump mounting bolts are tightened, loosen the bolts at the bracket on the rear of the pick-up, allowing the pick-up to assume its most natural position. This will relieve tension on the bracket. Tighten the oil pump mounting bolts to 16 ft. lbs. (21 Nm) and the sprocket bolts to 19 ft. lbs.
- Remove the oil pan as outlined in this section.
- Remove the 3 retaining bolts for the oil pump drive sprocket and pull off the sprocket.
- Open the lockplates for the pickup tube mounting bolts at the main bearing cap. Remove the 2 bolts for the support mount and the 2 oil pump retaining bolts. Lower the oil pump down and out of the car, taking care not to lose the O-ring in the oil pump housing.
Reverse the above procedure to install, observing the following installation notes:
- Adjust the oil pump drive chain tension so that the chain may be depressed under light thumb pressure. If the proper tension cannot be achieved with either of the replacement lengths of chain, shims (compensating plates) may be installed between the pump housing and the block to take up the slack. When installing shims, always make sure that the oil hole is not blocked. Use a new O-ring when possible.
- After tightening the pump mounting bolts to 16 ft. lbs. (21 Nm), loosen the pickup tube support bracket and retighten the bracket bolts so that the bracket is tension-free.
- Raise the vehicle and support it. Drain the engine oil.
- Remove the front lower splash guard.
- Unfasten the electrical terminal from the oil sending unit.
- Remove the flywheel cover.
- Remove the 3 oil pan bolts: one on one side and 2 on the other and lower the oil pan. Remove the oil pump bolts and take out the oil pump and oil pan.
Installation is the reverse of removal. Installation notes:
- Clean the gasket surfaces and use a new gasket on the oil pan.
- Positioning the pump for installation of its mounting bolts, guide the pump driveshaft into the hole in the center of the drive gear. Tighten the bolts to 16 ft. lbs. (21 Nm).
- Coat the joints on the ends of the front engine cover with a universal sealing compound.
- Install the sending unit wire and the engine oil.
On the diesel, the pump comes down as the oil pan is removed. Refer to the Oil Pan Removal and Installation procedure for details.