Crankshaft Overview

Fig 1: Crankshaft Assembly Overview

Courtesy of AUDI OF AMERICA, LLC

1. Bolt
   • Replace
   • 65 Nm plus an additional 90° (¹ /₄ turn)
2. Bearing Cap
   • Bearing cap 1: Belt pulley side
   • Retaining tabs of bearing shells and cylinder block/bearing caps must lie above one another
3. Bolt
   • Replace
   • 10 Nm plus an additional 90° (¹ /₄ turn)
   • Replace sensor wheel every time bolts are loosened, refer to Fig 2
4. Needle Bearing
   • For vehicles with manual transmission
   • Pulling out and driving in, refer to NEEDLE BEARING FROM CRANKSHAFTS 
5. Sensor Wheel
   • For engine speed (RPM) sensor -G28-
   • Only possible to install in one position - Bores are offset
   • Replace sensor wheel every time bolts are loosened
   • Removing and installing, refer to Fig 2
6. Crankshaft
   • After removal, place in such a way that it does not rest on sensor wheel -5- and damage it
   • Axial clearance, refer to CRANKSHAFT, MEASURING AXIAL PLAY 
   • Radial clearance, refer to CRANKSHAFT, MEASURING RADIAL PLAY 
   • Do not turn crankshaft when measuring radial play
   • Crankshaft dimensions, refer to CRANKSHAFT DIMENSIONS 
7. Thrust Washers
   • For bearing 3
8. Bearing Shell for Cylinder Block
   • With lubricating groove
   • Do not interchange used bearing shells (mark)
   • Classification for replacement part ordering, refer to NEEDLE BEARING FROM CRANKSHAFTS 
9. Chain Sprocket
   • For chain for oil pump
   • Removing and installing, refer to CHAIN SPROCKET 
10. Bearing Shell
    • Without lubricating groove
    • Do not interchange used bearing shells (mark)
    • The crankshaft bearing shells in the bearing caps are only available as a replacement part with a "yellow" color marking.

Fig 2: Identifying Attachment Points, Countersunk Screws, Crankshaft & Sensor Wheel

Courtesy of AUDI OF AMERICA, LLC

-- Always replace sensor wheel -2- whenever bolts are removed -1-.

• Tightening specifications, refer to CRANKSHAFT OVERVIEW 

Fig 3: Identification Of Crankshaft Bearing Shells For Cylinder Block (Gradual Introduction) - Engine Codes AEG, AVH, AZG, BEV

Courtesy of AUDI OF AMERICA, LLC

From the factory, the upper bearing shells are allocated to the cylinder block with the correct thickness. Colored spots serve to identify the bearing thicknesses.

The letters marked on the lower sealing surface of the cylinder block identify which bearing thickness must be installed in which location.