11 41 050 Removing and installing/replacing oil suction pump (S65)

WARNING: This page is about a different car, the 2011 BMW M3, 2010 BMW M3, 2009 BMW M3, and 2008 BMW M3. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Excessively low or high play between the gearwheel pairs results in failure of the oil supply.

Necessary preliminary tasks:

Remove ENGINE OIL SUMP .
Remove OIL PUMP .

Release screws (1).

Tightening torque. 11 41 3AZ .

Remove oil pump (2).

Fig 1: Identifying Oil Pump And Screws

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Replacing gear wheels

Necessary preliminary tasks:

Remove VIBRATION DAMPER .
Remove RADIAL SHAFT SEAL at front.

Mount special tool 11 6 254 on crankcase.

Secure special tool 11 6 252 with magnetic base to special tool 11 6 254.

NOTE: Special tool 11 6 254 can only be secured to the crankcase with one screw.

Picture shows (S85).

Fig 2: Securing Special Tool (11 6 252) With Magnetic Base To Special Tool (11 6 254)

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IMPORTANT: The oil pump chain of the oil suction pump must be removed.
The chain tensioner must not exert any tension on the oil suction pump.

Align special tool 11 6 251 with its measuring shaft (2) vertically to gearwheel (1).

Turn oil suction pump gearwheel (1) to stop.

Fig 3: Turning Oil Suction Pump Gearwheel

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Set special tool 11 6 251 to zero.

Turn oil suction pump gearwheel (1) in direction of arrow to stop.

Fig 4: Turning Oil Suction Pump Gearwheel

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Backlash on oil suction pump min. 0.06 to max. 0.08 mm.

If necessary, correct oil suction pump adjustment.

Fig 5: Measuring Oil Suction Pump Backlash

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Adjust oil suction pump (2) with a rubber mallet on pump housing in direction of arrow.

Tightening torque 11 41 3AZ .

Fig 6: Adjusting Oil Suction Pump

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Assemble engine.