Crankshaft: Service and Repair

11 21 500 Replacing crankshaft (N14)

Special tools required:







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. 00 00 Excerpt From Company Standard BMW GS 90003-2
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).
Tightening torque: 11 11 1AZ
Tighten bolts (11 to 28).
Tightening torque: 11 11 2AZ.







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 1 240.







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.