Oil Pump: Service and Repair

Balance shaft module with oil pump, removing and installing

Special tools, testers and auxiliary items required





^ Connecting Pin T10027

Removing
- Remove oil pan.

CAUTION: Only turn over the engine at the crankshaft in direction of engine rotation (clockwise).

Note:
^ Turning over the engine is performed at the center bolt of the crankshaft.





- Bring camshaft gear to marking for TDC cylinder 1 by turning crankshaft. Marking on camshaft gear must align with arrow on toothed belt guard.





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





- Loosen bolt from oil pump chain sprocket. Counter-hold at center bolt for vibration damper.





- Release tension on chain rail using a screwdriver - arrow - and secure it using an Allen wrench - 1 -, across flats 3 mm.





- Remove chain sprocket of oil pump and disengage chain on differential shaft drive.





- Remove oil baffle, removing bolts - 1 and 2 -.





- Remove bolts - arrows - from balance shaft assembly from outside to inside and remove it.

Installing
^ Chain tensioner pre-tensioned

- Replace all balance shaft assembly bolts.
- Replace balance shaft assembly bolt gasket.





- Place intermediate plate as shown on to alignment bushings of differential shaft gear -arrows -.





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

Note:
^ Observe the different lengths of bolts.

Note:
^ Pay attention to centering sleeves.

Tightening Sequence:

- Install oil baffle, thereby inserting tabs into balance shaft assembly - arrows - and tightening bolt - 1 - to 21 Nm and bolts - 2 - to 9 Nm.

Note:
^ Turning over engine is performed at the center bolt of the crankshaft.





- Set engine to TDC at cyl. 1, by turning crankshaft in engine running direction at the central bolt of the crankshaft toothed belt sprocket. Marking on camshaft sprocket and marking on crankshaft must be positioned at TDC for cyl. 1 - arrows -.





- Set marking on chain sprocket of differential shaft - arrow - opposite alignment bore. Secure chain sprocket in this position using connecting pin T10027. Place chain on to differential shaft chain sprocket.
- Install oil pump chain sprocket with new bolt and tighten bolt by hand.

Note:
^ Oil pump chain sprocket fits only in one position. To install, only the oil pump must be turned.





- Remove connecting pin T10027 and Allen wrench - 1 -. Secure chain sprocket of oil pump. Counter-hold at center bolt for vibration damper.

The rest of assembly is basically a reverse of disassembling sequence.

- Install oil pan.





Bolt allocation for balance shaft housing
A - Hex collar bolt M7x40

B - Hex collar bolt M7x70 C - Hex collar bolt M7x90

D - Hex collar bolt M7x55

E - Sealing plug with O-ring

Pre-loading chain tensioner





- Pretension piston by hand - arrow -.





- Push chain rail in direction of - arrow - and secure it with an Allen wrench - 1 -, wrench diameter 3 mm.