Overview - Crankshaft

Fig 1: Overview Of Crankshaft Assembly Components

Courtesy of AUDI OF AMERICA, LLC

1. Sealing Flange, Belt Pulley Side
   • Removing and installing. Refer to SEALING FLANGE, REMOVING AND INSTALLING, BELT PULLEY SIDE .
2. Bolt
   • Tightening specification. Refer to Figure.
3. Crankshaft
   • Axial Play, Measuring. Refer to CRANKSHAFT, MEASURING AXIAL CLEARANCE .
   • Radial play, measuring. Refer to CRANKSHAFT, MEASURING RADIAL CLEARANCE .
   • Crankshaft Dimensions. Refer to CRANKSHAFT DIMENSIONS .
4. Alignment Sleeve
   • Quantity: 4
   • Insert into guide frame. Refer to Fig 4
5. Seal
   • Replace
6. Bolt
   • For guide frame to cylinder block sealing surfaces
   • There are different bolt lengths and bolt heads
   • Tightening sequence. Refer to Fig 5
7. Long Bolt, Large Shoulder
   • For inner row of guide frame
   • Tightening sequence. Refer to Fig 5
   • Use old bolts to measure radial play.
8. Short Bolt, Small Shoulder
   • For outer row of guide frame
   • Tightening 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 OVERVIEW - TIMING MECHANISM DRIVE CHAIN -item 1- "Guide Rail".
   • Sealant application. Refer to Fig 4
   • Oil Pressure Regulation Valve -N428-, Removing and Installing. Refer to Oil Pressure Regulation Valve -N428-, REMOVING AND INSTALLING .
10. Seal
    • Replace
11. Thrust Washer
    • Only on 3rd crankshaft bearing
    • Installed position: the oil groove faces outside
    • 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 the bearing shells worn down to the base layer
    • Note the installation position
    • Insert new bearing shells for guide frame with proper color marking. Refer to Fig 7.
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 the bearing shells worn down to the base layer
    • Note the installation position
    • Insert new bearing shells for cylinder block with proper color marking. Refer to Fig 6
15. Cylinder Block

Fig 2: Identifying Locking Bolt (Crankshaft)

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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. Connector
2. O-ring - replace
3. Bolt - 9 Nm
4. Oil Pressure Regulation Valve -N428-

Fig 4: Identifying Sealant Application

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-- 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 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: Guide Frame Bolts Tightening Sequence

Courtesy of AUDI OF AMERICA, LLC

-- 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 steps 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-.

Fig 6: 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: 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.
• 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.