Oil Pump: Service and Repair

11 41 000 - Removing and installing / replacing oil pump (S85)





Necessary preliminary tasks:
- Removing oil pan Service and Repair.





Release screws (1).

Installation:
Replace screws.
Clean threads before installation.





Release screw (1).
Release screw (2).
Detach oil pipes from oil pump.





Installation:
Replace sealing ring (1).
To aid installation, apply a thin coat of engine oil to sealing ring (1).
Clean all sealing surfaces.





Release screw (2).
Fold sliding rail (3) downwards.
Unscrew nut (1).
Remove sprocket wheel from shaft.

Installation:
If reusing the sprocket wheel, check dihedron for damage and if necessary replace.





Important!
Chain tensioner piston may fall out.

Remove piston (1) in direction of arrow.





Installation:
Arrangement, chain tensioner, oil pump.

1. - Base valve
2. - Spring
3. - Piston





Release screw (1) on oil pump.





Release screws (1).
Remove oil pump (2).

Installation:
Check dihedron on oil pump shaft (3) for damage, replace oil pump if necessary.
Clean thread of oil pump shaft (3) with suitable means.





Important!
Two different versions of oil pump are fitted with different tightening torques.

Place sprocket wheel (1) with chain (3) on oil pump shaft (2).

Rotate oil pump shaft (2) with a screwdriver in direction of arrow until dihedrons of oil pump shaft and sprocket wheel are flush.
Coat thread (2) with Loctite 648 (refer to BMW Parts Service).





Tighten nut (1).
Tightening torque: 11 41 1AZ 11 41 Oil Pump with Strainer and Drive.





Installation:
Check tensioning travel of chain tensioner.

Slide caliper gauge (1) as far as it will go on reverse side of sliding rail.

Adjust caliper gauge (1) to tensioning rail.

Note:
Checking dimension: 72.5 to 80 mm.
If the dimension 80 mm is exceeded, shims Removing and Installing / Replacing VANOS High-Pressure Pump (S85) must be fitted on the VANOS high-pressure pump.





Assemble engine.