Crankshaft: Service and Repair
Crankshaft Overview
If large quantities of metal particles or other deposits such as those caused by partial seizure of the crankshaft or connecting rod damage are found in the engine oil, clean the oil channels thoroughly and replace the engine oil cooler to prevent further damage.
Engine must not be set down on oil pan, because the fluid seal between lower and upper oil pan is otherwise damaged.
• Secure the engine on the engine and transmission holder (VAS 6095) with the universal mounting (VAS 6095/1) and the brackets (VAS 6095/1-4) when performing assembly work.
1 Crankshaft
• Checking the axial play. Refer to => [ Crankshaft Axial Clearance, Checking ] Crankshaft Axial Clearance, Checking.
• Checking the radial clearance. Refer to => [ Crankshaft Radial Clearance, Checking ] Crankshaft Radial Clearance, Checking.
• Do not rotate the crankshaft when measuring the radial play.
• Crankshaft dimensions, refer to => [ Crankshaft Dimensions ] Crankshaft Dimensions.
2 Alignment Sleeve
• Quantity: 2
• Inserted in the cylinder block.
3 Guide Frame
• Installing, refer to => [ Guide Frame, Installing ].
4 Bolt
• Always replace.
• Tightening sequence, refer to => [ Guide Frame, Installing ].
5 Thrust Washer
• Only on the 3rd crankshaft bearing.
• The lubricating grooves face outward.
• Pay attention to the locating point.
• Checking the crankshaft axial clearance. Refer to => [ Crankshaft Axial Clearance, Checking ] Crankshaft Axial Clearance, Checking.
6 Bearing Shell
• For the guide frame.
• Do not interchange used bearing shells (mark them).
• Bearing shells that are worn down to the nickel layer must be replaced.
• Insert new bearing shells for the guide frame with the proper color code. Refer to => [ Allocation of Crankshaft Bearing Shells for the Guide Frame ].
7 Torque Converter Centering Bushing
• For information regarding the centering bushing refer to => [ Torque Converter Centering Bushing ].
8 Alignment Pin
• Make sure the crankshaft fits correctly.
9 Thrust Washer
• Only on the 3rd crankshaft bearing.
• The lubricating grooves face outward.
• Pay attention to the locating point.
• Checking the crankshaft axial clearance. Refer to => [ Crankshaft Axial Clearance, Checking ] Crankshaft Axial Clearance, Checking.
10 Bearing Shell
• For the cylinder block, with a oil groove.
• Do not interchange used bearing shells (mark them).
• Insert new bearing shells for the cylinder block with the proper color code. Refer to => [ Allocation of Crankshaft Bearing Shells for the Cylinder Block ].
Guide Frame, Installing
- Replace the bolts - 1 through 16 -.
- Insert the alignment sleeves in the guide frame.
- Tighten the guide frame bolts in the following sequence:
- Tighten the bolts - 1 through 16 - to 30 Nm.
- Tighten the bolts - 1 through 16 - to 50 Nm.
- Tighten the bolts - 1 through 16 - an additional 90° (1/4) turn.
Allocation of Crankshaft Bearing Shells for the Cylinder Block
Bearing shells with the correct thickness are allocated to the cylinder block by the factory. Colored dots on the bearing shells serve to identify the bearing shell thickness.
• The - arrow - points to the belt pulley side.
Allocation of bearing shells to the cylinder block is identified with a letter by each bearing.
Allocation of Crankshaft Bearing Shells for the Guide Frame
• Bearing shells with the correct thickness are allocated to the bearing cap by the factory. Colored dots on the bearing shells serve to identify the bearing shell thickness.
• Allocation of the bearing shells to the crankshaft is identified with sequence of letters on the crankshaft side. The prefix "1" - arrow - indicates the color code for bearing cap 1.
Torque Converter Centering Bushing
• On partial and replacement engines, new as well as replacement crankshafts are delivered without the centering bushing - arrow -. The bushing must be installed before installing the drive plate.