Oil Pump: Service and Repair

Oil Pump and Oil Pan Overview


If metal shavings or a large quantity of small metal particles are found when repairing an engine, this could indicate that the crankshaft and connecting rod bearings are damaged. To prevent further damage, perform the following steps after the repair:

• Thoroughly clean the oil passages

• Replace the oil spray jets

• Replace the oil cooler

• Replace the oil filter element






1 Bolt

• 15 Nm

2 Sealing Flange

• With the seal.

• Must be located on the alignment sleeves.

• Removing and installing, refer to => [ Sealing Flange, Belt Pulley Side ] Service and Repair.

• Install using silicone sealant (D 176 404 A2).

• Do not additionally oil or grease the sealing lip of the seal.

• Before installing, remove any remaining oil from the crankshaft journal with a clean cloth.

3 Chain Tensioner with Tensioning Rail

• 15 Nm

• When installing, pretension the spring and hook in.

4 Oil Dipstick

• Oil level must not be above the MAX. mark!

• Marks, refer to => [ Engine Oil Level, Checking ] Testing and Inspection.

5 Guide Tube

6 Guide Tube

7 Alignment Sleeves

8 O-ring

• Always replace.

9 Bolt

• 15 Nm

10 Suction Line

• Clean the strainer if contaminated.

11 Splash Wall

12 Bolt

• 15 Nm

13 Bolt

• 15 Nm

14 Oil Pan

• Removing and installing, refer to => [ Oil Pan ] Oil Pan.

• Clean the sealing surface before installing.

• Install using silicone sealant (D 176 404 A2).

15 Oil Drain Plug

• 30 Nm

• Always replace.

16 Bolt

• 10 Nm

17 Oil Level Thermal Sensor (G266)

• 3 pin connector, black.

• Checking, refer to the vehicle diagnostic tester.

18 Seal

• Always replace.

19 Oil Pump

• With a pressure relief valve, 12 bar.

• Before installing, check to be sure both alignment bushings are present (for centering oil pump/cylinder block).

• Check if the oil pump moves with difficulty.

• Replace it if it moves with difficulty.

20 Oil Pump Sprocket

21 Bracket

• For the oil level thermal sensor wiring harness.

22 Bolt

• 20 Nm + an additional 90° (1/4) turn.

23 Chain

24 Bolt

• 27 Nm

• Install without sealant.

25 Oil Spray Jet

• For cooling the piston, refer to => [ Oil Spray Jet and Pressure Relief Valve ].

Oil Spray Jet and Pressure Relief Valve





1. Bolt with pressure relief valve, 27 Nm

2. Oil spray jet (for piston cooling)


• When replacing the oil spray jet, pay attention to the correct allocation for the pistons. Refer to the Parts Catalog.

See the "caution" at the top.