Crankshaft: Service and Repair
11 21 500 Replacing crankshaft (N54, N54T)Special tools required:
Important!
Aluminium screws/bolts must be replaced each time they are released.
Aluminium screws/bolts are permitted with and without colour coding (blue).
For reliable identification:
Aluminium screws/bolts are not magnetic.
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
^ Remove oil sump
^ Remove oil pump
^ Remove triangular drive for oil pump
^ Remove timing chain module
^ Remove cylinder head.
^ Remove flywheel
^ Removing all pistons
Release screws (1).
Tightening torque 11 13 5AZ.
Installation note:
Replace aluminium screws.
Remove oil deflector (2).
Release screws (1).
Tightening torque 11 11 2AZ.
Unfasten screws (2).
Tightening torque 11 11 3AZ.
Installation note:
Replace aluminium screws.
Release screws (1).
Tightening torque 11 11 4AZ.
Unfasten screws (2).
Tightening torque 11 11 2AZ.
Installation note:
Replace aluminium screws.
Release steel screws (1 to 14) from outside inwards.
Tightening torque 11 11 1AZ.
Release screws (1).
Tightening torque 11 11 3AZ.
Installation note:
Replace aluminium screws.
Remove crankshaft lower section in upward direction.
Remove both crankshaft seals (1).
Note:
Graphic shows N46.
Remove main bearing shells (2 and 3), replace if necessary.
Remove and install crankshaft (1) in direction of arrow.
Important!
Remove crankshaft with aid of a second person.
Weight of crankshaft approx. 25 kg.
Check guide sleeves (1) for damage and correct seating.
Reinstall crankshaft.
Installation note:
Lubricate all bearing points with engine oil.
Clean all sealing surfaces.
Note:
Graphic shows N46.
Tighten steel screws (1 to 14) from inside outwards.
Tightening torque 11 11 1AZ.
Tighten screws (2) from inside outwards.
Tightening torque 11 11 2AZ.
Tighten screws (1).
Tightening torque 11 11 4AZ.
Installation note:
Replace aluminium screws.
Tighten aluminium screws exclusively with special tool 00 9 120.
Important!
In the case of aluminium screws, jointing torque and angle of rotation must be observed without fail.
Set up stand with magnetic base on special tool 11 4 440.
Set up special tool 00 2 510 on stand.
Position special tool 00 2 510 on crankshaft.
Move crankshaft in direction of arrow.
Determine bearing play.
Installation note:
Always replace nozzles (1).
Drive in both nozzles (1) with special tool 11 9 360 on left and right into crankcase.
Installation note:
Crankshaft seal - replace front.
Crankshaft seal - replace rear.
Installation note:
Use primer 1.3 and liquid gasket 1.4.
Prepare liquid sealing compound (1) in special tool 11 4 370.
Screw on nozzle for injecting liquid gasket.
Slowly insert liquid sealing compound (1) with special tool 11 4 370 in direction of arrow.
Stop (seal off) escaping liquid sealing compound with primer 1.3. (Graphic shows N40).
Assemble engine.
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