Crankshaft: Description and Operation

Crankshaft Overview


• The upper bearing bracket is bolted to the cylinder with two M8 multipoint bolts, which are found in the valley between the cylinder heads. These bolts must not be loosened under any circumstances, because it causes a deformation of the cylinder block which is no longer reparable.

• The crankshaft, piston, and connecting rods must not be replaced! Only removal and installation of these components is permitted.

• Secure the engine to the engine and transmission holder (VAS 6095) when working on it.






1 Bearing Bracket, Lower

• Installed in a tensioned state.

• Removing and installing, refer to => [ Lower Bearing Bracket ] Service and Repair.

2 Thrust Washer

• For the lower bearing bracket.

3 Bolt

• Note the tightening sequence and specification, refer to => [ Main Bearing Bolt Tightening ] Service and Repair.

4 Bearing Shell

5 Crankshaft

• Axial play new: 0.07...00.17 mm, Wear limit: 0.37 mm.

• Check radial clearance using Plastigage 0.03...00.08 mm, Wear limit: 0.17 mm.

• Do not rotate the crankshaft when measuring radial play.

• Crankshaft dimensions, refer to => [ Crankshaft Dimensions ] Crankshaft Dimensions.

6 Bolt

• 8 Nm

7 Oil Spray Jet

• For piston cooling.

8 Bearing Shell

9 Cylinder Block

• With the upper bearing bracket.

• Checking the cylinder bore, refer to => [ Cylinder Bore, Checking ] Testing and Inspection.

• Piston and cylinder dimensions, refer to => [ Piston and Cylinder Dimensions ] [1][2]Specifications.

10 Engine Speed Sensor (G28)

• To remove, the right engine mount and bracket must be removed, refer to => [ Engine Mounts and Brackets ] Service and Repair.

11 Bolt

• 10 Nm

12 Thrust Washer

• For the upper bearing bracket.