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Crankshaft dimensions > < Removing and installing crankshaft

A3 Mk1

Crankshaft - exploded view of components
   
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   From approx. 05.2000 onwards: install new bearing shells for the cylinder block with the correct coloured markings → Fig.
2 - Drive 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   From approx. 05.2000 onwards: the crankshaft bearing shells in the bearing caps are only supplied as spare parts with “yellow” colour-coding.
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 - 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.
9 - 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 (holes are off-set).
Tightening torque
  A13-0150
ComponentNm
Sender wheel to crankshaft10 + 90° 1)2)
l  1) Renew bolts.
l  2) 90° = one quarter turn.

   
From approx. 05.2000 onwards: allocation of crankshaft bearing shells for cylinder block
From approx. 05.2000 onwards, bearing shells of the correct thickness are matched to the bearings in the cylinder block at the factory. Coloured dots are used to identify the thickness of the bearing shells.
  Note
The -arrow- points to pulley end.
Letter codes on lower sealing surface of cylinder block indicate which bearing shell is to be fitted at each location.
  A13-0405
Letter on cylinder blockColour coding of bearing
S=Black
R=Red
G=Yellow

  Note
The crankshaft bearing shells in the bearing caps are only supplied as spare parts with “yellow” coloured markings.
   

Crankshaft dimensions > < Removing and installing crankshaft