Oil Pump with Balance Shaft Drive

Oil Pump with Balance Shaft Drive

Special tools, testers and auxiliary items required

• Connecting pin (T10027)

• Flat scraper

• Silicone sealant (D 176 404 A2)

Removing

- Remove the oil pan. Refer to => [ Oil Pan ] Oil Pan.

- Remove the chain guard. Disengage the locking lugs through the openings - arrows - if necessary using a small screwdriver.





- Remove the oil pump chain sprocket bolt. The center bolt of the vibration damper can be counter held.





CAUTION!
The chain sprocket driving the balance shafts must not be loosened!

- Release the tension on the tensioning rail using a screwdriver in the - direction of the arrow - and secure it using an 3 mm hex wrench - 1 -, across the flats.





- Remove the oil pump chain sprocket and remove the chain from the balance shaft drive.





- Loosen the oil pump with balance shaft bolts working from the outside toward inside and remove it. Oil pump with balance shaft assembly overview. Refer to => [ Oil Pump with Balance Shaft Drive Assembly Overview ] Oil Pump with Balance Shaft Drive Assembly Overview.





- Remove the intermediate plate.

Installing and Adjusting

• Preload the chain tensioner.

• Note the expiration date of the sealing compound.

• Differential shaft gear with intermediate plate and oil pan must be installed and tightened immediately after application of silicon sealant.

- Remove the sealant residue from the cylinder block with a flat scraper.

- Cut the tube nozzle at the front marking (nozzle diameter approximately 3 mm).

- Apply the silicon sealant to a clean sealing surfaces of the new intermediate plate as shown.





Note the following points:

• The sealant bead must be 2 to 3 mm thick.

• Sealant bead must continue to the inner side of the bolt holes - arrows -.

• Sealant bead must be on the cylinder block. No sealant is necessary on the oil pan.

• Sealant bead must not be thicker than specified. Otherwise, excess sealant could get into the oil pan and clog the strainer in the intake side of the oil pump.

- Place the intermediate plate as shown onto the alignment pins - arrows - of balance shaft drive.





- Install the oil pump with balance shaft gear and intermediate plate. Tighten the bolts - arrows - from the inside toward the outside.





• Tightening specification: 15 Nm + 90° (1/4) additional turn

• Note the different length of bolts, refer to => [ Balance Shaft Gear Bolt Allocation ].

- Turn the crankshaft to set cylinder 1 at Top Dead Center (TDC).





- Set the mark on the balance shaft chain sprocket - arrow - opposite alignment bore. Secure the chain sprocket in this position using the (T10027). Place the chain onto the balance shaft chain sprocket.





- Install the oil pump chain sprocket and tighten the bolt by hand.

• The oil pump chain sprocket fits only in one position. To install, only the oil pump must be turned.

- Remove the (T10027) and 3 mm hex wrench - 1 -. Tighten the oil pump chain sprocket bolt.





• Tightening specification: 20 Nm + 90° (1/4) additional turn

- Center bolt of the vibration damper can be counter held.

Balance Shaft Gear Bolt Allocation





A M7 x 40
B M7 x 70
C M7 x 90
D M7 x 55
E Sealing plug with O-ring

The rest of the assembly is basically a reverse of the removal sequence.

- Install the oil pan. Refer to => [ Oil Pan ] Oil Pan.

Chain Tensioner Pre-Tensioning

- Preload the piston - arrow - by hand.





- Push the tensioning rail in the - direction of the arrow - and secure it with a 3 mm hex wrench - 1 - across flats.