11 21 500 Replacing crankshaft (N18)

Special tools required:

WARNING: Rotating components (danger of injury.).
It is absolutely essential to follow the procedure described below and the instructions on handling the special tools.

IMPORTANT: Jointing torque and angle of rotation must be observed without fail (risk of damage).

Necessary preliminary tasks:

Remove ENGINE .
Mount engine on ASSEMBLY STAND .
Remove VIBRATION DAMPER .
Removing OIL SUMP .
Remove OIL PUMP .
Remove TIMING CHAIN .
Remove CYLINDER HEAD .
Remove FLYWHEEL .

Release screws (1).

Tightening torque 11 13 3AZ .

Remove oil deflector (2).

Remove all PISTONS .

Fig 1: Identifying Oil Deflector Screws

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Risk of damage. on crankcase.

Drive out cover plates (1) with a cross-cut chisel (2).

Fig 2: Removing Cover Plates With Cross-Cut Chisel

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (28 to 11).

Release screws (10 to 1).

Fig 3: Lower Crankcase Bolts Tightening Sequence

Courtesy of BMW OF NORTH AMERICA, INC.

Release crankcase lower section in direction of arrow with a regular screwdriver (2) and an open-end spanner (1) at press-off lug.

Fig 4: Releasing Crankcase Lower Section With Regular Screwdriver

Courtesy of BMW OF NORTH AMERICA, INC.

Remove both radial shaft seals (1).

NOTE: Illustration N43.

Fig 5: Identifying Crankshaft Radial Seals

Courtesy of BMW OF NORTH AMERICA, INC.

Remove crankshaft (1).

IMPORTANT: Remove crankshaft with aid of a second person.
Weight of crankshaft approx. 19 kg.

Remove MAIN BEARING SHELLS , replace if necessary.

Fig 6: Identifying Crankshaft

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Do not clean sealing surfaces with a metal-cutting tool.

Clean sealing surfaces with special tools 11 4 471 and 11 4 472 .

Fig 7: Cleaning Sealing Surfaces With Special Tools (11 4 471) And (11 4 472)

Courtesy of BMW OF NORTH AMERICA, INC.

Check fitting bush (1) for damage and correct seating.

Fig 8: Identifying Fitting Bush

Courtesy of BMW OF NORTH AMERICA, INC.

Apply a sealing bead (1) on the lower crankcase section (see illustration) with Loctite 5970 sealing compound.

See OVERVIEW OF CONSUMABLES (2.2) .

Installation note:

Follow manufacturer's instructions (Loctite).

Fig 9: Identifying Crankcase Lower Section Sealing Bead

Courtesy of BMW OF NORTH AMERICA, INC.

Apply a sealing bead (1) on the upper crankcase section (see illustration) with Loctite 5970 sealing compound.

Installation note:

Follow manufacturer's instructions (Loctite).

Fig 10: Identifying Crankcase Upper Section Sealing Bead

Courtesy of BMW OF NORTH AMERICA, INC.

Insert crankshaft (1).

IMPORTANT: Rotating component (danger of injury.)
Insert crankshaft with aid of a second person.
Weight of crankshaft approx. 19 kg.

Fig 11: Identifying Crankshaft

Courtesy of BMW OF NORTH AMERICA, INC.

Lubricate all bearings from 1 to 5 with engine oil.

Install crankcase lower section.

Fig 12: Identifying Bearings For Lubrication

Courtesy of BMW OF NORTH AMERICA, INC.

Tighten bolts (1 to 10).

Tightening torque: 11 11 1AZ .

Tighten bolts (11 to 28).

Tightening torque: 11 11 2AZ .

Fig 13: Lower Crankcase Bolts Tightening Sequence

Courtesy of BMW OF NORTH AMERICA, INC.

Tighten bolts exclusively with special tool 00 9 120 .

IMPORTANT: Jointing torque and angle of rotation must be observed without fail.

Fig 14: Tightening Aluminum Screws Using Special Tool (00 9 120)

Courtesy of BMW OF NORTH AMERICA, INC.

To prevent oil leakage, apply a thin coating of Loctite 648 to cover sleeve (1) in area (2).

See OVERVIEW OF CONSUMABLES (2.3) .

Fig 15: Identifying Cover Sleeve Coating Area

Courtesy of BMW OF NORTH AMERICA, INC.

Knock in cover sleeves with special tool 23 1 240 as far as they will go.

Fig 16: Fitting Cover Sleeves With Special Tool (23 1 240)

Courtesy of BMW OF NORTH AMERICA, INC.

Determine crankshaft side clearance.

Affix special tool 11 6 252 with magnet.

Set special tool 11 6 251 to zero.

Press crankshaft in direction of arrow to the limit position.

Refer to TECHNICAL DATA .

Fig 17: Fixing Special Tool (11 6 252) With Magnet

Courtesy of BMW OF NORTH AMERICA, INC.

Replace radial shaft seal at FRONT .

Replace radial shaft seal at REAR .

Assemble engine.