11 21 505 Sealing crankcase lower section (N20, N26)

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2016 BMW 328i xDrive, 2016 BMW 328d xDrive, 2015 BMW 328i xDrive, 2015 BMW 328d xDrive, and 2014 BMW 328i xDrive. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

IMPORTANT: Changed procedure.
It is not necessary to remove the cylinder head and the crankshaft.

Necessary preliminary tasks:

Remove ENGINE .
Mount ENGINE on assembly stand.
Remove left and right engine support arm.
Remove oil sump . See 11 13 000 REMOVING AND INSTALLING, SEALING OR REPLACING OIL SUMP (N20, N26) or 11 13 000 REMOVING AND FITTING, SEALING OR REPLACING THE OIL SUMP (N20 ALL-WHEEL DRIVE VEHICLE) .
Remove VIBRATION DAMPER .
Remove COUNTERBALANCE SHAFT .

Release hose clamp (1) and detach coolant hose.

Tightening torque: 11 51 3AZ

Unfasten plug connection (2) and disconnect.

Release screws (3) and remove coolant pump.

Tightening torque: 11 51 2AZ

Fig 1: Coolant Pump And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw (1).

Tightening torque: 11 42 6AZ .

Remove oil return line (2).

Installation note:

Replace O-ring.

Remove vent line (3).

Fig 2: Oil Return Line And Screw

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: The dowel hole for the TDC setting is on the exhaust side below the exhaust manifold.

Rotate engine at central bolt and secure flywheel in position with special tool 11 0 300.

Fig 3: Securing Flywheel With Special Tool (11 0 300)

Courtesy of BMW OF NORTH AMERICA, INC.

Secure flywheel with special tool (1) 11 9 260 .

NOTE: Ensure that special tool 11 9 260 is fully engaged in the flywheel gearing.

Fig 4: Dual-Mass Flywheel With Special Tool (11 9 260)

Courtesy of BMW OF NORTH AMERICA, INC.

Automatic transmission:

Release flywheel bolts (1).

Release special tool (2).

Remove flywheel (3).

Fig 5: Removing Flywheel Bolts

Courtesy of BMW OF NORTH AMERICA, INC.

Manual gearbox:

IMPORTANT: Position crankshaft at TDC.

Fig 6: Flywheel Bolts

Courtesy of BMW OF NORTH AMERICA, INC.

Remove dual-mass flywheel.

Secure flywheel with special tool 11 9 260 .

Release flywheel bolts with special tool 11 4 180 /

IMPORTANT: Magnet wheel (1) is magnetic.
Keep magnet wheel (1) in a plastic bag away from swarf.

Fig 7: Magnet Wheel

Courtesy of BMW OF NORTH AMERICA, INC.

Remove magnet wheel (1) from crankshaft.

Installation note:

Check the fitting sleeve for damage.

Note the installation position of the magnet wheel.

Release screw on pulse sensor (1).

Slide PULSE SENSOR (2) upwards.

Fig 8: Screw On Pulse Sensor

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 9: Crankcase Bolts And Line

Courtesy of BMW OF NORTH AMERICA, INC.

Release all crankcase bolts (1) along line (2).

Fig 10: Crankcase Lower Section Bolts Tightening/Loosening Sequence (N20)

Courtesy of BMW OF NORTH AMERICA, INC.

Release crankcase bolts M10 in sequence 10 to 1.

Release crankcase lower section (1) from crankcase upper section (2) with suitable tool (3)

Remove crankcase lower section (1) upwards.

IMPORTANT: Do not rotate crankshaft without crankcase lower section (1) (risk of damage) .

Fig 11: Releasing Crankcase Lower Section From Crankcase Upper Section Using Tool

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Timing chain is preloaded.
Do not raise crankshaft.

Carefully remove radial shaft seal (1).

Catch escaping engine oil with a cloth (2).

Fig 12: Removing Radial Shaft Seal

Courtesy of BMW OF NORTH AMERICA, INC.

Carefully remove radial shaft seal (1) towards front.

Catch escaping engine oil with a cloth (2).

Fig 13: Catching Escaping Engine Oil Using Cloth

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Protect crankcase against sealant residues with a cloth (1).
Remove sealing compound residues (1) with special tool 11 4 470 .

Fig 14: Cloth For Protect Crankcase

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Check durability of sealing compound, do not use sealing compound that has expired.

Maximum processing time of the SEALING COMPOUND 2.2 10 minutes.

Fig 15: Crankcase Lower Section Sealing Compound Applying Areas

Courtesy of BMW OF NORTH AMERICA, INC.

Apply sealing compound in the stated areas with a width of 2.0 to 2.6 mm.

Fit crankcase lower section (watch fitting bushes).

Fig 16: Fitting Crankcase Lower Section

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 17: Crankcase Lower Section Bolts Tightening/Loosening Sequence (N20)

Courtesy of BMW OF NORTH AMERICA, INC.

Screw in all M10 crankcase screws in the sequence 1 to 10 and tighten with JOINTING TORQUE .

Identify all M10 crankcase bolts with a colored marking (1) for checking.

Fig 18: Crankcase Bolts With Colored Mark

Courtesy of BMW OF NORTH AMERICA, INC.

Retighten all screws using special tool 00 9 120 , observing the specified sequence.

Tightening torque: 11 11 1AZ .

Installation note:

After tightening all screws, the colored mark must be aligned in the same way.

Fig 19: Tightening Screws Using Special Tools (00 9 120)

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 20: Crankcase Screws And Line

Courtesy of BMW OF NORTH AMERICA, INC.

Insert all crankcase screws (1) and tighten from the inside to the outside.

Tightening torque: 11 11 2AZ .

IMPORTANT: The following text describes the installation and sealing between the engine block and crankshaft seal at the front.
The engine block will not be leak proof at the outside of the crankshaft seal if you fail to comply with the individual work steps and the work sequence.

Connect supporting sleeve (1) to special tool 2 212 822 .

Position radial shaft seal (2) carefully in direction of arrow on special tool 2 212 822 .

Fig 21: Positioning Radial Shaft Seal On Special Tool (2 212 822)