Crankshaft: Service and Repair

11 21 500 Replacing crankshaft (N14)

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.





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





Release screws (28 to 11).
Release screws (10 to 1).





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





Remove both radial shaft seals (1).





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.





Important:
Do not clean sealing faces with a metal-cutting tool.

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





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





Apply sealing bead (1) to crankcase lower half (see picture) with Loctite 5970 sealing compound (see BMW Parts Service).
Installation:
Follow manufacturer's instructions (Loctite).





Apply sealing bead (1) to crankcase upper half (see picture) with Loctite 5970 sealing compound (see BMW Parts Service).
Installation:
Follow manufacturer's instructions (Loctite).





Insert crankshaft (1).

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





Lubricate all bearings from 1 to 5 with engine oil.
Install crankcase lower half.





Tighten bolts (1 to 10).

Tighten Main bearing screws, observe tightening specification
1AZ Main bearing screws, observe tightening specification.
M9x115
Jointing torque 30 Nm
Torque angle 150 °
Note: Replace screws

Tighten bolts (11 to 28).

Tighten Bedplate, observe tightening specification
2AZ Bedplate, observe tightening specification.
M6
Jointing torque 9 Nm
Note: Replace screws





Tighten bolts exclusively with special tool 00 9 120.

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





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





Drive cover sleeves firmly home with special tool 23 1240.





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.
Refer to Technical Data.





Replace radial shaft seal at front.
Replace radial shaft seal at rear.
Assemble engine.