Crankshaft: Service and Repair

11 21 500 Replacing Crankshaft (N16)

Special tools required:







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







IMPORTANT: The 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.







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







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







Release crankcase lower section in direction of arrow with a regular screwdriver (2) and an open-end spanner (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 crankshaft with aid of a second person. Weight of crankshaft approx. 19 kg.







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

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







Apply sealing bead (1) to crankcase lower section (see picture) with Loctite 5970 sealing compound (see BMW Parts Service).

Installation note:
Follow manufacturer's instructions (Loctite).







Apply sealing bead (1) to crankcase upper section (see picture) with Loctite 5970 sealing compound (see BMW Parts).
Apply a light coating of engine oil to bearings.







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 section.
Position crankcase lower section using two dowel pins on the crankcase upper section.







Tighten bolts (1 to 10).
Tightening torque: 11 11 1AZ.
Tighten bolts (11 to 28).
Tightening torque: 11 11 2AZ.







Only use special tool to secure bolts 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 648 to cover sleeve (1) in area (2).







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







Determine side clearance of crankshaft.
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.







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