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Crankshaft dimensions > < Removing and installing crankshaft

A3 Mk1

Crankshaft - exploded view of components
   
Crankshaft - exploded view of components
1 - Thrust washers
q   For bearing No. 3
q   Installation position: oil grooves face toward crank webs
2 - Bearing shell for cylinder block
q   With oil groove
q   Do not interchange used bearing shells (mark positions)
q   Install new bearing shells for the cylinder block with the correct coloured markings → Fig.
q   Note location
q   Check radial clearance with Plastigage
3 - Chain sprocket
q   For oil pump chain
q   Renewing → Chapter
4 - Crankshaft
q   Axial clearance when new: 0.07 ... 0.23 mm; Wear limit: 0.30 mm
q   Check radial clearance with Plastigage
q   Do not rotate the crankshaft when checking the radial clearance
q   Radial clearance when new: 0.017 ... 0.037 mm; Wear limit 0.07 mm
q   Crankshaft dimensions → Chapter
5 - Bearing shell for bearing cap
q   Without oil groove
q   Do not interchange used bearing shells (mark positions)
q   The crankshaft bearing shells in the bearing caps are only supplied as spare parts with “yellow” coloured markings.
q   Note location
q   Check radial clearance with Plastigage
6 - 40 Nm + 90° (1/4 turn) further
q   Renew
q   For measuring radial clearance of crankshaft, tighten to 40 Nm but not further
7 - Bearing cap
q   Bearing cap 1: Pulley end
q   Installation position: Bearing shell retaining lugs (cylinder block/bearing cap) must be on the same side.
8 - 10 Nm + 90° (1/4 turn) further
q   Renew
q   Sender wheel must be renewed if bolts are loosened → Fig.
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.

   
Removing and installing sender wheel
–  Sender wheel -2- must always be renewed after slackening off bolts -1-.
  Note
t  After fastening for a second time, attachment point of countersunk-head bolts in sender wheel is deformed to such an extent that bolt heads make contact with crankshaft -3--arrows- and sender wheel beneath bolts is loose.
t  Sender wheel can only be installed 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.

   
Allocation of crankshaft bearing shells for cylinder block
Bearing shells of the correct thickness are allocated to the cylinder block at the factory. Coloured dots on bearing shell are used to identify bearing shell thickness.
  Note
t  The -arrow- points to pulley end.
t  The markings are visible without removal of the sump.
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
B=Blue
G=Yellow
R=Red
W=White

  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