Crankshaft, Assembly Overview
Crankshaft, Assembly Overview
• Secure engine to assembly stand using Engine and Transmission Holder (VAS 6095) when performing repair work => [ Engine, Securing on Assembly Stand ] Engine, Securing on Assembly Stand.
1 Cylinder block
• If the cylinder block is being replaced, then the bearing shells must be re-allocated => [ Allocation of the crankshaft bearing shells (classing) ]
2 Bearing shell for cylinder block
• With lubricating groove
• do not interchange used bearing shells (mark)
• Crankshaft bearing shell identification => [ Allocation of the crankshaft bearing shells (classing) ]
3 Crankshaft
• after removal, place in such a way it does not rest on sensor wheel - item 5 - and damage it
• If the crankshaft is being replaced, then the bearing shells must be re-allocated to the bearing cover => [ Allocation of the crankshaft bearing shells (classing) ]
• Axial clearance => [ Crankshaft, Measuring Axial Play ] Crankshaft, Measuring Axial Play
• Radial clearance => [ Crankshaft, Measuring Radial Play ] Crankshaft, Measuring Radial Play
• do not turn crankshaft when measuring radial play
• Crankshaft dimensions => [ Crankshaft Dimensions ] [1][2]Crankshaft, Engine
• Removing and installing => [ Sensor Wheel, Removing and Installing ]
4 Bearing shell
• Without lubricating groove
• do not interchange used bearing shells (mark)
• Crankshaft bearing shell identification => [ Allocation of the crankshaft bearing shells (classing) ]
5 Bolt
• Observe tightening sequence => [ Crankshaft, tightening sequence ]
• Replace
6 Bearing cap
• Bearing cap 1: Belt pulley side
• Retaining tabs of bearing shells and cylinder block/bearing caps must lie above one another
7 Bolt
• 10 Nm + 1/4 turn (90 °)
• Replace
• replace sensor wheel every time bolts are loosened => [ Sensor Wheel, Removing and Installing ]
8 Sensor wheel
• for engine speed (rpm) sensor (G28)
• Only possible to install in one position - Bores are offset
• replace sensor wheel every time bolts are loosened
• Removing and installing => [ Sensor Wheel, Removing and Installing ]
9 Thrust washers
• For bearing 3
10 Bolt
• Observe tightening sequence => [ Crankshaft, tightening sequence ]
• Replace
Crankshaft, tightening sequence
- Tighten the crankshaft bolts in - 1 to 5 - sequence:
1. Tighten the bolts - 1 through 10 - and - arrows - by hand.
2. Tighten the bolts - 1 through 10 - to 65 Nm.
3. Tighten the bolts - 1.. 10 - an additional 90° using a rigid wrench.
4. Pre-tighten the bolts - arrows - to 20 Nm.
5. Tighten the bolts - arrows - 90° further using a rigid wrench.
Sensor Wheel, Removing and Installing
- Remove engine.
- Remove the crankshaft sealing flange => [ Transmission-Side Sealing Flange, Removing and Installing ] Transmission-Side Sealing Flange, Removing and Installing.
- Remove the upper section of the oil pan => [ Oil Pan, Upper Section, Removing and Installing ] Oil Pan, Upper Section, Removing and Installing.
- Remove the balance shaft timing chain => [ Balance Shaft Timing Chain, Removing and Installing ] Balance Shaft Timing Chain, Removing and Installing.
- Remove the connecting rod bearing cover.
- Remove the crankshaft bearing cover.
- Remove the crankshaft and then remove the sensor wheel.
- Always replace sensor wheel - 2 - whenever bolts are removed - 1 -.
• After tightening a second time, the attachment point of the countersunk screws of the sensor wheel are so deformed that the screw heads lie on the crankshaft - 3 - - arrows - and the sensor wheel is loose underneath the screws.
• Installation of sensor wheel is only possible in one position - the bores are offset.
• Tightening specifications => [ Crankshaft, Assembly Overview ] Crankshaft, Assembly Overview
Allocation of the crankshaft bearing shells (classing)
The bearing shells are allocated to the cylinder block with the correct thickness at the factory. Colored spots serve to identify the bearing thicknesses.
The code letters on the lower contact surface or on the top of the cylinder block identify which bearing shell and where it must be mounted on the cylinder block (upper bearing shell).
The code letters on the crankshaft identify which bearing shells and where they must be installed in the bearing cover (lower bearing shell).
The first letter is for bearing cover one, the second for bearing cover two, etc.
Cylinder block:
The identification of the cylinder block may be located either on the oil pan sealing surface or on the top (transmission side) of the cylinder block.
The identification on the cylinder block is for the upper bearing shell.
- Note the letters and then match it to the color identification in the table.
Crankshaft:
The identification on the crankshaft is for the lower bearing shell.
- Note the letters and then match it to the color identification in the table.
