Crankshaft: Service and Repair
Crankshaft Overview
• To perform assembly work, secure the engine using the bracket for V6 FSI engine, Audi A6 (VAS 6095/1-5) on the engine and transmission holder (VAS 6095). Refer to => [ Engine, Securing to Engine and Transmission Holder ] Procedures.
1 Sealing Flange (belt pulley side)
• Removing and installing, refer to => [ Sealing Flange with Crankshaft Seal, Belt Pulley Side ] Service and Repair
2 Bolt
• Tightening specification, refer to => [ Ribbed Belt Pulley Side Sealing Flange - Tightening Specifications and Sequence ] Ribbed Belt Drive Overview
3 Crankshaft
• Measuring axial play, refer to => [ Axial Clearance, Measuring ] Testing and Inspection
• Radial clearance, measuring, refer to => [ Radial Clearance, Measuring ] Radial Clearance, Measuring
• Crankshaft dimensions, refer to => [ Crankshaft Dimensions ] [1][2]Crankshaft, Engine
4 Alignment Bushing
• Quantity: 4
• Insert into guide frame, refer to => [ Sealant Application for Guide Frame, Position of Alignment Bushings ]
5 Gasket
• Replace
6 Bolt
• For guide frame to cylinder block sealing surfaces
• Varying bolt lengths and bolt heads
• Tightening sequence, refer to => [ Installing Guide Frame ]
7 Long Bolt, Large Shoulder
• For inner row of guide frame
• Tightening sequence, refer to => [ Installing Guide Frame ]
8 Short Bolt, Small Shoulder
• For outer row of guide frame
• Tightening sequence, refer to => [ Installing Guide Frame ]
9 Guide Frame
• To remove, remove timing chain guide rail => [ (Item 1) Guide Rail ] Timing Mechanism Drive Chain Overview
• Sealant application, refer to => [ Sealant Application for Guide Frame, Position of Alignment Bushings ]
• Oil pressure regulation valve, removing and installing, refer to => [ Oil Pressure Regulation Valve (N428) ] Oil Pressure Regulation Valve (N428)
10 Seal
• Replace
11 Thrust Washer
• Only at 3rd crankshaft bearing
• Installed position: lubricating grooves face outward
• Note locating point in guide frame
12 Bearing Shell
• For guide frame without lubricating groove
• Mark used bearing shells for reinstallation but not on the running surface
• Replace bearing shells that have worn down to the nickel layer
• Pay attention to the installed position
• Insert new bearing shells for guide frame with proper color marking, refer to => [ Allocation of Crankshaft Bearing Shells for Guide Frame ]
13 Not Installed
14 Bearing Shell
• For cylinder block with oil groove
• Mark used bearing shells for reinstallation but not on the running surface
• Replace bearing shells that have worn down to the nickel layer
• Pay attention to the installed position
• Insert new bearing shells for cylinder block with proper color marking, refer to => [ Allocation of Crankshaft Bearing Shells for Cylinder Block ]
15 Cylinder Block
"TDC" Marking Locking Bolt - Tightening Specification
• Replace the O-ring.
- Tighten the locking bolt - arrow - to 14 Nm.
Oil Pressure Regulation Valve (N428)
1. Electrical harness connector
2. O-ring - replace
3. Bolt - 9 Nm
4. Oil pressure regulation valve (N428)
Sealant Application for Guide Frame, Position of Alignment Bushings
- Clean the sealing surfaces; they must be free of oil and grease.
- Apply sealant beads - arrows - to the clean sealing surfaces on the guide frame as shown in the illustration.
• The groove of the sealing surface must be completely filled with sealant.
• The sealant beads must be 1.5 to 2.0 mm above the sealing surface.
- Position seals - 1 and 2 -.
- Check if the alignment bushings - 3 through 6 - are inserted at the locations in the guide frame as shown in the illustration.
Installing Guide Frame
- Replace the guide frame bolts.
- Insert the long bolts in the inner row of the guide frame.
- Tighten the bolts - 1 through 31 - in 3 stages as follows:
- Tighten the bolts to 50 Nm in the following sequence: - 1 to 16 -.
- Tighten the bolts an additional 90° in the following sequence: - 1 to 16 -.
- Tighten the bolts for the guide frame sealing surfaces on the cylinder block to 23 Nm in the following sequence: - 17 to 31 -.
Allocation of Crankshaft Bearing Shells for Cylinder Block
• Bearing shells with the correct thickness are allocated to the cylinder block in the factory. Colored dots on sides of bearing shells serve for identifying bearing shell thickness.
• Allocation of bearing shells to cylinder block is marked by a letter on the respective bearing on guide frame
Allocation of Crankshaft Bearing Shells for Guide Frame
• Bearing shells with the correct thickness are allocated to the guide frame in the factory. Colored dots on the sides of the bearing shells serve for identifying bearing shell thickness.
• Allocation of bearing shells to guide frame is marked on flywheel flange of crankshaft by a row of letters. The first letter of the row of letters represents bearing "1", the second letter is for bearing "2", etc.
