Crankshaft: Service and Repair
11 21 500 Replacing crankshaft (N63)Special tools required:
Important!
Weight of crankshaft is approx. 20 kg.
Risk of injury from sharp edge of housing.
Necessary preliminary work:
^ Remove engine
^ Mount engine on assembly stand
^ Remove cylinder head.
^ Remove hub for vibration damper
^ Removing lower timing case cover
^ Removing oil pan
^ Remove oil pump
^ Removing piston
^ Remove flywheel
^ Remove radial shaft seals
^ Remove timing chains
Installation note:
Layout of main bearing caps.
All numbers must be read from the cylinder bank (5 to 8) (see arrows).
Main bearing caps (1 to 5) opposite the output end on the timing chain drive.
Release oil pump spacer bolts (1) with special tool 13 5 020.
Release main bearing taper screw connection (1).
Release oil pump spacer pins (2).
Release all threaded support sleeves (1).
Release collar bolts (M8) in sequence 10 to 1.
Release collar bolts (M11) in sequence 10 to 1.
Remove main bearing caps 1 to 5.
Important!
Remove crankshaft with a 2nd person, weight approx. 25 kg.
Lift out crankshaft and set down safely (secure against turning).
Release screw for oil nozzle (1).
Tightening torque: 11 11 8 AZ.
Installation note:
Check oil nozzle (1) for clear passage with compressed air.
Observe fastening on oil nozzle.
Installation note:
Observe fastening in crankcase.
Replace crankshaft main bearing shells.
Installation note:
Observe arrangement of main bearing caps.
All numbers must be read from the cylinder bank (5 to 8) (see arrows).
Main bearing caps (1) is opposite the output end on the timing chain drive.
Turn back all threaded support sleeves hand-tight.
Installation note:
Coat all bearing positions with engine oil.
Important!
Install crankshaft with a 2nd person, weight approx. 25 kg.
Install crankshaft.
Fit bearing caps (1 to 5).
Set down bearing caps positioned from 1 to 5.
Insert all collar bolts (M11) hand-tight.
Secure collar bolts (M11) in sequence (1 to 10).
Installation note:
For a better overview of the screw connection quality, mark the head of all collar bolts after joining with a line (1) using an oil-proof marker pen.
Check angle tightening.
Secure collar bolt (1) with special tool 00 9 120.
Tightening torque: 11 11 1AZ.
Insert all collar bolts (M8) hand-tight.
Secure collar bolts (M8) in sequence (1 to 10).
Installation note:
For a better overview of the screw connection quality, mark the head of all collar bolts after joining with a line (1) using an oil-proof marker pen.
Check angle tightening.
Secure collar bolt (1) with special tool 00 9 120.
Secure all threaded support sleeves (1) with special tool 11 4 350.
Tightening torque: 11 11 3 AZ.
Secure main bearing taper screw connection (1).
Tightening torque: 11 11 4 AZ.
Secure oil pump spacer pins (2).
Tightening torque: 11 11 5 AZ.
Check crankshaft coefficient of friction.
Determine crankshaft breakaway torque with special tool 00 2 010.
Rotate crankshaft at central bolt using special tool 00 2 010.
If the breakaway torque is too high, it will be necessary to correct the bearing clearance.
Secure special tool 11 6 252 to crankcase with magnetic base.
Slide crankshaft in direction of arrow forwards as far as it will go.
Set special tool 11 6 251 to zero.
Slide crankshaft (1) in direction of arrow towards rear and determine value.
Check axial play.
Assemble engine.
