Audi Workshop Service and Repair Manuals

Crankshaft - exploded view of components

1 -	Bearing shell

q	For cylinder block (with oil groove)

q	Do not interchange used bearing shells (mark positions)

q	Inserting bearing shells for cylinder block with correct colour-coding → Fig.

2 -	Chain sprocket

q	For oil pump chain

q	Renewing → Chapter

3 -	Bearing shell

q	For bearing cap (without oil groove)

q	Do not interchange used bearing shells (mark positions)

q	Inserting bearing shells for bearing cap with correct colour-coding → Fig.

4 -	Thrust washers

q	For bearing No. 3

q	Note location

5 -	65 Nm + 90° (1/4 turn) further

q

Renew

q	For measuring radial clearance of crankshaft, tighten to 65 Nm but not further

6 -	Bearing cap

q	Bearing cap 1: Pulley end

q	Bearing cap 3 with recesses for thrust washers

q	Bearing shell retaining lugs (cylinder block/bearing cap) must be on the same side

7 -	10 Nm + 90° (1/4 turn) further

q

Renew

q	Sender wheel must be renewed if bolts are loosened → Fig.

8 -	Needle bearing

q	For vehicles with manual gearbox

q	Extracting and driving in: open version → Chapter, closed version → Chapter

9 -	Sender wheel

q	For engine speed sender -G28-

q	Can only be installed in one position. Holes are off-set

q	Sender wheel must be renewed if bolts are loosened

q	Removing and installing → Fig.

10 -	Crankshaft

q	Axial clearance (new): 0.07 ... 0.23 mm

q	Axial clearance: wear limit: 0.30 mm

q	Check radial clearance with Plastigage

q	Radial clearance (new): 0.02 ... 0.04 mm

q	Radial clearance: wear limit: 0.15 mm

q	Do not rotate the crankshaft when checking the radial clearance

q	Crankshaft dimensions → Chapter

Removing and installing sender wheel –  Sender wheel -2- must always be renewed after slackening off bolts -1-.   Note t  If the countersunk bolts are tightened a second time, the seats for the bolt heads in the sender wheel will be deformed to such an extent that the bolt heads make contact with the crankshaft -3--arrows- and the sender wheel beneath the bolts will be loose. t  Sender wheel can only be fitted in one position because holes are offset. Tightening torque

Component	Nm
Sender wheel to crankshaft	10 + 90° 1)2)
l  1) Renew bolts. l  2) 90° = one quarter turn.

Allocation of crankshaft bearing shells for cylinder block Bearing shells of the correct thickness are assigned to the cylinder block at the factory. Coloured dots are used to identify the thickness of the bearing shells.   Note The -arrow- points in direction of travel. Letter codes on lower sealing surface of cylinder block indicate which bearing shell is to be fitted at each location.

Letter on cylinder block		Colour coding of bearing
B	=	Blue
R	=	Red
G	=	Yellow
S	=	Black
W	=	White

Matching crankshaft bearing shells to bearing caps t  Bearing shells of the correct thickness are assigned to the bearing caps at the factory. Coloured dots on the bearing shells are used to identify the bearing shell thickness. t  The correct allocation of bearing shells to crankshaft is indicated by a sequence of letters on the crankshaft flange. The number -1- indicates the colour code for bearing “No. 1”.

Letter on crankshaft		Colour coding of bearing
B	=	Blue
R	=	Red
G	=	Yellow
W	=	White