Overview - Crankshaft

Fig 1: Crankshaft Assembly Exploded View

Courtesy of AUDI

1. Cylinder Block
2. Cylinder Block Bearing Shell
   • With oil groove
   • Replace any worn bearing shells
   • Crankshaft bearing shells identification (classification). Refer to MAIN BEARING SHELLS ALLOCATION .
   • Lubricate with engine oil
3. Crankshaft
   • For assembly work, secure the engine on the engine and transmission holder. Refer to ENGINE, SECURING TO ENGINE AND TRANSMISSION HOLDER .
   • Removing and Installing. Refer to CRANKSHAFT, REMOVING AND INSTALLING .
   • After removing, set it aside so that the sensor wheel -item 8-  OVERVIEW - CRANKSHAFT is not rested on and becomes damaged
   • If the crankshaft is being replaced, then the bearing shells must be reallocated to the bearing cap. Refer to MAIN BEARING SHELLS ALLOCATION .
   • Axial play, measuring. Refer to CRANKSHAFT, MEASURING AXIAL CLEARANCE .
   • Radial play, measuring. Refer to CRANKSHAFT, MEASURING RADIAL CLEARANCE .
   • Crankshaft dimensions. Refer to CRANKSHAFT DIMENSIONS .
4. Bearing Shell for Bearing Cap
   • Replace any worn bearing shells
   • Without oil groove
   • Crankshaft bearing shells identification (classification). Refer to MAIN BEARING SHELLS ALLOCATION .
   • Lubricate with engine oil
5. Bolt
   • Replace after removing
   • Use old bolts for the radial clearance measurement
   • Tightening specification and sequence. Refer to Fig 2.
6. Bearing Cap
   • Bearing cap allocation. Refer to Fig 3.
7. Bolt
   • 10 Nm +90°
   • Replace after removing
   • Replace the sensor wheel -item 8-  OVERVIEW - CRANKSHAFT every time the bolts are loosened. Refer to SENSOR WHEEL, REMOVING AND INSTALLING .
8. Sensor Wheel
   • For the Engine Speed Sensor -G28-
   • Only possible to install in one position
   • Replace the sensor wheel every time the bolts -item 7-  OVERVIEW - CRANKSHAFT are loosened
   • Removing and Installing. Refer to SENSOR WHEEL, REMOVING AND INSTALLING .
   • After replacing an adaptation must be preformed. Refer to PERFORM ADAPTATIONS AFTER COMPONENT REPLACEMENT .
9. Thrust Washers
   • For bearing 3
   • Lubricate with engine oil
10. Bolt
    • Replace after removing
    • Tightening Specifications and Sequence. Refer to Fig 2.

Crankshaft - Tightening Specification and Sequence

Fig 2: Crankshaft - Tightening Sequence

Courtesy of AUDI

• Replace bolts that were tightened with an additional turn after removing them.

-- Tighten the bolts in the steps in the sequence shown:

Bearing Cap Allocation

Fig 3: Bearing Cap Allocation

Courtesy of AUDI

The bearing caps are marked to the cylinder block to prevent them from being incorrectly installed.

• The tabs -arrows- on the bearing caps point toward the crankshaft bearing "3" on the intake side.