11 21 500 Replacing crankshaft (N12)

WARNING: This page is about a different variant/trim than selected.

Special tools required:

00 9 120
11 4 471
11 4 472
11 6 251
11 6 252
23 1 240

WARNING: Rotating components (danger or 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 pan.
Remove oil pump.
Remove timing chain.
Remove cylinder head.
Remove flywheel.

Release screws (1).

Tightening torque 11 13 5AZ

Remove oil deflector (2).

Remove all pistons.

Fig 1: Identifying Screws

Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 2: Identifying Cover Plates And Cross-Chisel

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (26 to 11).

Release screws (10 to 1).

Fig 3: Removal Sequence Of Screws

Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 4: Releasing Crankcase Lower Half

Courtesy of BMW OF NORTH AMERICA, INC.

Remove both radial shaft seals (1).

Fig 5: Identifying Radial Shaft 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 faces with a metal-cutting tool.

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

Fig 7: Cleaning Sealing Faces With Special Tools

Courtesy of BMW OF NORTH AMERICA, INC.

Check guide sleeves (1) for damage and correct seating.

Fig 8: Identifying Guide Sleeves

Courtesy of BMW OF NORTH AMERICA, INC.

Apply sealing bead (1) to crankcase lower half (see illustration) with Loctite 5970 sealing compound.

Installation:

Follow manufacturer's instructions (Loctite).

Fig 9: Identifying Sealing Bead

Courtesy of BMW OF NORTH AMERICA, INC.

Apply sealing bead (1) to crankcase upper half (see illustration) with Loctite 5970 sealing compound.

Apply a light coating of engine oil to bearings.

Fig 10: Identifying 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 half.

Fig 12: Identifying Bearings

Courtesy of BMW OF NORTH AMERICA, INC.

Tighten bolts (1 to 10).

Tightening torque 11 11 1AZ

Tighten bolts (11 to 26).

Tightening torque 11 11 2AZ

Fig 13: Tightening Sequence Of Crankshaft Bolts

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: Identifying Special Tool (00 9 120)

Courtesy of BMW OF NORTH AMERICA, INC.

To prevent oil leakage, apply a thin coating of Loctite 273 to cover sleeve (1) in area (2).

Fig 15: Identifying Cover Sleeve

Courtesy of BMW OF NORTH AMERICA, INC.

Drive cover sleeves firmly home with special tool 23 1 240.

Fig 16: Driving Cover Sleeves

Courtesy of BMW OF NORTH AMERICA, INC.

Determine crankshaft axial clearance.

Attach special tool 11 6 252 with magnet.

Set special tool 11 6 251 to zero.

Press crankshaft in direction of rotation up to stop.

Fig 17: Pressing Crankshaft

Courtesy of BMW OF NORTH AMERICA, INC.

Replace radial shaft seal at front.

Replace radial shaft seal at rear.

Assemble engine.