Audi Workshop Service and Repair Manuals

Crankshaft - exploded view

1 -	Sealing flange (pulley end)

q	Removing and installing → Chapter

2 -

Bolt

q	Tightening torque → Fig.

3 -	Crankshaft

q	Measuring axial clearance → Chapter

q	Measuring radial clearance → Chapter

q	Crankshaft dimensions → Chapter

4 -	Dowel sleeve

q

4 x

q	Inserting in retaining frame → Fig.

5 -

Seal

q

Renew

6 -

Bolt

q	For sealing surfaces: retaining frame to cylinder block

q	Differing bolt lengths and bolt heads

q	Tightening sequence → Fig.

7 -	Bolt (long, large collar)

q	For retaining frame (inner row)

q	Tightening sequence → Fig.

8 -	Bolt (short, small collar)

q	For retaining frame (outer row)

q	Tightening sequence → Fig.

9 -	Retaining frame

q	With valve for oil pressure control -N428- → Fig.

q	To remove, detach guide rail → Item for drive chain for valve gear

q	Applying sealant → Fig.

q	Removing and installing valve for oil pressure control -N428- → Chapter

10 -

Seal

q

Renew

11 -	Thrust washer

q	Only fitted on 3rd crankshaft bearing

q	Installation position: oil grooves face outwards

q	Make sure it engages in retaining frame

12 -	Bearing shell

q	For retaining frame (without oil groove)

q	Mark used bearing shells for re-installation but not on bearing surface

q	Bearing shells worn down to base layer must be renewed

q	Note installation position

q	Install new bearing shells for retaining frame with correct coloured markings → Fig.

13 -	Not fitted

14 -	Bearing shell

q	For cylinder block (with oil groove)

q	Mark used bearing shells for re-installation but not on bearing surface

q	Bearing shells worn down to base layer must be renewed

q	Note installation position

q	Install new bearing shells for the cylinder block with the correct coloured markings → Fig.

15 -	Cylinder block

Plug for “TDC” marking - tightening torque   Note Fit new O-ring. –  Tighten plug -arrow- to 14 Nm.

Valve for oil pressure control -N428- 1 -  Electrical connector 2 -  O-ring - renew 3 -  Bolt, 9 Nm 4 -  Valve for oil pressure control -N428-

Applying sealant to retaining frame, position of dowel sleeves –  Clean sealing surfaces; they must be free of oil and grease. –  Apply beads of sealant -arrows- onto clean sealing surfaces of retaining frame as shown in illustration. l  The groove on the sealing surface must be completely filled with sealant. l  The beads of sealant must project 1.5 … 2.0 mm above the sealing surface. –  Fit seals -1- and -2-. –  Check that dowel sleeves -3 ... 6- are inserted in retaining frame at positions shown in illustration.

Installing retaining frame –  Renew bolts for retaining frame. –  Install long bolts in inner row on retaining frame. –  Tighten bolts -1 … 31- in 3 stages as follows: 1.  Tighten bolts in the sequence -1 ... 16- to 50 Nm. 2.  Turn bolts 90° further in the sequence -1 ... 16-. 3.  Tighten bolts for sealing surfaces (retaining frame / cylinder block) in the sequence -17 ... 31- to 23 Nm.

Matching crankshaft bearing shells to bearings in cylinder block t  Bearing shells of the correct thickness are matched to the bearings in the cylinder block at the factory. Coloured dots on the side of the bearing shells are used to identify the bearing shell thickness. t  The allocation of the bearing shells to the bearing positions in the cylinder block is indicated by a code letter at the relevant bearing on the retaining frame.

Code letter on retaining frame		Colour coding of bearing
R	=	Red
G	=	Yellow
B	=	Blue
S	=	Black

Matching crankshaft bearing shells to bearings in retaining frame t  Bearing shells of the correct thickness are matched to the bearings in the retaining frame at the factory. Coloured dots on the side of the bearing shells are used to identify the bearing shell thickness. t  The allocation of the bearing shells to the bearing positions in the retaining frame is indicated by a sequence of letters on the flywheel flange on the crankshaft. The first letter in the sequence stands for bearing “1”, the second letter for bearing “2”, etc.

Letter on crankshaft		Colour coding of bearing
R	=	Red
G	=	Yellow
B	=	Blue
S	=	Black