Oil Pump: Service and Repair

11 41 000 Removing And Installing/Replacing Oil Pump (N63)

Special tools required:







IMPORTANT:
All adjusting procedures on the chain drive must be observed.
A timing chain which is tensioned too tautly can cause noises in the chain drive.
A timing chain that is too slack can cause the timing chain to jump.
Risk of damage in oil pump drive.







Necessary preliminary tasks:
- Drain engine oil.
- Remove lower oil sump section.







Unscrew nuts (2).
Tightening torque: 11 41 1 AZ.
Remove intake pipe (1).

Installation note:
Replace O-ring.







Release all nuts (1) using special tool 11 7 201.
Tightening torque 11 41 5 AZ.
Remove oil pump drive gear.

NOTE: Graphic shows engine removed







Unscrew nuts (1).
Release screws, remove oil pump (1) with aid of a second person.

Installation note:
Replace screws.
Tightening torque 11 41 2AZ.

NOTE: Graphic without top oil sump







Detach oil lines (1) upwards in direction of arrow.

NOTE: Graphic without top oil sump







Installation note:
Replace sealing rings (1).
Lightly oil sealing ring 1 (1).
Coat sealing ring (2) with suitable lubricant.







Installation note:
Replace O-ring (1) for oil feed line.







Fit oil lines (1) in direction of arrow.







Installation note:
When the oil pump is renewed, the oil deflector (2) must be modified.

Release screws (1).
Tightening torque: 11 41 6 AZ.







Fit special tool 11 8 920 on special tool 11 9 280.







IMPORTANT:
Left-hand thread on oil pump screw connection.
Do not grip oil pump drive with a pair of pliers risk of damage.







IMPORTANT: Nut (1) has left-hand thread.

Position special tool 11 8 920 on sprocket. Slacken nut (1).







Installation note:
Check mounting flats on pump shaft (1) for damage.







IMPORTANT: Nut (1) has left-hand thread.

Grip pump with assistance of a second person.
Secure nut (1) with special tool 00 9 120.
Tightening torque: 11 41 4 AZ







Join and secure nuts (1).
Tightening torque 11 41 2 AZ.

NOTE: Graphic without top oil sump







Install oil pump drive gear.
Secure all nuts (1) with special tool 11 7 201.
Tightening torque 11 41 5 AZ.







Adjust oil pump timing chain.
Pretension oil pump adjusting sleeve (1) with a hexagon socket wrench.
Adjustment value 10 mm +2.

NOTE: Graphic without top oil sump







Procedure on removed engine:
Upper oil sump has been removed.
Minimally preload timing chain (1) with special tool 51 0 342.
Read off measured value A on special tool 51 0 342 and note down.

IMPORTANT: Do not use force to preload timing chain (1).







Using a screwdriver (1), preload timing chain to minimal extent in direction of arrow.
Read off measured value B on special tool 51 0 342 and note down.

IMPORTANT: Do not use force preload timing chain.

Measured value A minus measured value B results in the adjustment value.
Adjustment value 10 mm +2.







Procedure on installed engine:
Upper oil sump has been installed.
Position drag pointer (1) of special tool 2 213 485 on oil pump chain.







Installation note:
Attachment point (1) N63 / S63.
Attachment point (2) N74.







IMPORTANT:
Do not use force preload timing chain.
Push drag pointer (1) to the left and right until value has been determined.
Adjustment value 10 mm +2.







Adjust oil pump timing chain.
Pretension oil pump adjusting sleeve (1) with a hexagon socket wrench.
Adjustment value 10 mm +2.

NOTE: Graphic without top oil sump







Join and secure screw (2).
Tightening torque 11 41 2 AZ.

NOTE: Graphic without top oil sump







Assemble engine.