Crankshaft Overview

Fig 1: Identifying Crankshaft Overview

Courtesy of AUDI OF AMERICA, LLC

1. Sealing Flange (belt pulley side)
   • Removing and installing, refer to SEALING FLANGE WITH CRANKSHAFT SEAL, BELT PULLEY SIDE 
2. Bolt
   • Tightening specification and sequence, refer to Figure
3. Crankshaft
   • Axial play, measuring, refer to CRANKSHAFT, MEASURING AXIAL PLAY 
   • Radial clearance, measuring, refer to CRANKSHAFT, MEASURING RADIAL PLAY 
   • Crankshaft dimensions, refer to CRANKSHAFT DIMENSIONS 
4. Alignment Bushing
   • Quantity: 4
   • Insert into guide frame, refer to Fig 4
5. Gasket
   • Replace
6. Bolt
   • For guide frame to cylinder block sealing surfaces
   • There are different bolt lengths and bolt heads
   • Tightening specification and sequence, refer to Fig 5
7. Long Bolt, Large Shoulder
   • For inner row of guide frame
   • Replace
   • Tightening specification and sequence, refer to Fig 5
8. Short Bolt, Small Shoulder
   • For outer row of guide frame
   • Tightening specification and sequence, refer to Fig 5
9. Guide Frame
   • With oil pressure regulation valve -N428-, refer to Fig 3
   • To remove, remove timing chain guide rail, refer to item 1: TIMING MECHANISM DRIVE CHAIN OVERVIEW
   • Sealant application, refer to Fig 4
   • Oil Pressure Regulation Valve -N428-, removing and installing, refer to Oil Pressure Regulation Valve -N428-
10. Seal
    • Replace
11. Thrust Washer
    • Crankshaft bearing 3 only
    • Installed position: the oil groove faces outside
    • Note locating point in guide frame
12. Bearing Shell
    • For guide frame without lubricating groove
    • Replace any worn bearing shells
    • Pay attention to the installed position
    • Insert new bearing shells for guide frame with proper color marking, refer to Fig 7
13. Thrust Washer
    • Crankshaft bearing 3 only
    • Installed position: the oil groove faces outward
    • Note locating point in guide frame
14. Bearing Shell
    • For cylinder block with oil groove
    • Replace any worn bearing shells
    • Pay attention to the installed position
    • Insert new bearing shells for cylinder block with proper color marking, refer to Fig 6
15. Cylinder Block

Fig 2: Identifying Locking Bolt -Arrow-

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-- Tighten the locking bolt -arrow- to 14 Nm.

Fig 3: Identifying Oil Pressure Regulation Valve -N428-

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1. Electrical harness connector
2. O-ring - replace
3. Bolt, 9 Nm
4. Oil pressure regulation valve -N428-

Fig 4: Identifying Sealant Application For Guide Frame And Position Of Alignment Bushings

Courtesy of AUDI OF AMERICA, LLC

-- Clean any oil or grease off the sealing surfaces.

-- Apply sealant beads -arrows- to the clean sealing surfaces on the guide frame as shown in the illustration.

• The groove of 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 alignment bushings -3 through 6- are inserted at the locations in the guide frame as shown in the illustration.

Fig 5: Identifying Guide Frame Bolts Tightening Sequence

Courtesy of AUDI OF AMERICA, LLC

-- Insert the long bolts in the inner row of the guide frame.

-- Tighten the bolts in 3 steps in the sequence shown:

Fig 6: Identifying Allocation Of Crankshaft Bearing Shells For Cylinder Block

Courtesy of AUDI OF AMERICA, LLC

• 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

Fig 7: Identifying Allocation Of Crankshaft Bearing Shells For Guide Frame

Courtesy of AUDI OF AMERICA, LLC

• Bearing shells with the correct thickness are allocated to the guide frame in the factory. Colored dots on sides of bearing shells serve for identifying bearing shell thickness.
• The allocation of the bearing shells for the guide frame is identified by a series of letters on the crankshaft flywheel flange. The first letter of the row of letters represents bearing "1", the second letter is for bearing "2", etc.