Overview - Crankshaft

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NOTE:

For assembly work, secure the engine on the Engine And Transmission Holder VAS6095. Refer to ENGINE, SECURING ON ENGINE AND TRANSMISSION HOLDER .

Fig 1: Crankshaft Assembly Component Location Overview

Courtesy of AUDI OF AMERICA, LLC

Sealing Flange, Belt Pulley Side
- Replacing. Refer to SEALING FLANGE WITH CRANKSHAFT SEAL, BELT PULLEY SIDE, REMOVING AND INSTALLING
Bolt
- Tightening specification and sequence. Refer to Figure
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
Alignment Sleeve
- Quantity: 4
- Insert into guide frame. Refer to Fig 4
Seal
- Replace
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.
Bolt
- Long, large shoulder
- For inner row of guide frame
- Replace
- Use old bolts to measure radial play.
- Tightening specification and sequence. Refer to Fig 5
Bolt
- Short, small shoulder
- For outer row of guide frame
- Tightening specification and sequence. Refer to Fig 5
Guide Frame
- With Oil Pressure Regulation Valve - N428-.Refer to Fig 8
- To remove, remove timing chain guide rail. Refer to -item 1-, OVERVIEW - TIMING MECHANISM DRIVE CHAIN
- Sealant application. Refer to Fig 4
- Oil Pressure Regulation Valve -N428-, emoving and Installing. Refer to Oil Pressure Regulation Valve -N428-, EMOVING AND INSTALLING .
Seal
- Replace
Thrust Washer
- Crankshaft bearing 3 only
- Installed position: the oil groove faces outside
- Note locating point in guide frame
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
Thrust Washer
- Crankshaft bearing 3 only
- Installed position: the oil groove faces outside
- Pay attention to the locating point on the cylinder block
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
Cylinder Block

Fig 2: Identifying Crankshaft Locking Bolt

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NOTE:

Replace the O-ring.

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

Fig 3: Identifying Oil Pressure Regulation Valve -N428-

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Connector
O-ring - replace
Bolt, 9 Nm
Oil Pressure Regulation Valve -N428-

Fig 4: Applying Sealant Beads To Clean Sealing Surfaces Of Guide Frame

Courtesy of AUDI OF AMERICA, LLC

-- 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

NOTE:

Replace any bolts that were tightened with an additional turn.

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

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

Step	Bolts	Tightening Specification/Additional Turn
1	-1 to 16-	50 Nm
2	-1 to 16-	Tighten 90° additional turn
3	-17 to 31-	20 Nm
4	-17 to 31-	Tighten 90° additional turn

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

Letter on Guide Frame		Color of Bearing
R	=	Red
G	=	Yellow
B	=	Blue
S	=	Black

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 transmission flange of crankshaft by a row of letters. The first letter of the row of letters represents bearing "1", he second letter is for bearing "2", tc.

Letter on Crankshaft		Color of Bearing
R	=	Red
G	=	Yellow
B	=	Blue
S	=	Black

Fig 8: Identifying Oil Pressure Regulation Valve -N428-

Courtesy of AUDI OF AMERICA, LLC