Crankshaft Overview

Fig 1: Exploded View Of Crankshaft Assembly And Component Parts

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

1. Cylinder Block
   • Cylinder bore checking. Refer to CYLINDER BORE, CHECKING .
   • If the cylinder block is being replaced, then the bearing shells must be allocated again. Refer to MAIN BEARING SHELL ALLOCATION .
   • For the correct piston and cylinder dimensions, refer to PISTON AND CONNECTING ROD OVERVIEW .
2. Bearing Shell for the Cylinder Block
   • With a lubricating groove.
   • Do not interchange used bearing shells (mark them).
   • Crankshaft bearing shell, allocating. Refer to MAIN BEARING SHELL ALLOCATION .
3. Crankshaft
   • After removal, lay aside so that sensor wheel -8- is not rested on and becomes damaged.
   • If the crankshaft is being replaced, then the bearing shells must be allocated to the bearing cap. Refer to MAIN BEARING SHELL ALLOCATION .
   • Crankshaft bearing cap tightening sequence. Refer to Fig 2.
   • Crankshaft needle bearing, replacing. (vehicles with a Direct Shift Gearbox®). Refer to CRANKSHAFT NEEDLE BEARING .
   • Checking the axial play, refer to CRANKSHAFT AXIAL CLEARANCE, CHECKING .
   • Checking the radial play, refer to CRANKSHAFT RADIAL CLEARANCE, CHECKING .
   • Do not rotate the crankshaft when measuring the radial play.
   • Crankshaft dimensions, refer to CRANKSHAFT DIMENSIONS .
4. Bearing Shell
   • Without a lubricating groove.
   • Do not interchange used bearing shells (mark them).
   • Crankshaft bearing shell, allocating. Refer to MAIN BEARING SHELL ALLOCATION .
5. Bolt
   • Tightening sequence and specification, refer to Fig 2.
   • Always replace.
6. Bearing Cap
   • Bearing cap 1: Belt pulley side.
   • Retaining tabs on the bearing shells and cylinder block/bearing caps must align above one another.
7. Screw
   • 10 Nm + an additional 90° (1/4) turn.
   • Always replace.
   • Replace the sensor wheel every time the screws are loosened. Refer to CRANKSHAFT SENSOR WHEEL .
8. Sensor Wheel
   • For the engine speed sensor.
   • Only possible to install in one position - Bores are offset.
   • Replace the sensor wheel every time the screws are loosened. Refer to CRANKSHAFT SENSOR WHEEL .
9. Thrust Washers
   • For bearing 3.
10. Bolt
    • Tightening sequence, refer to Fig 2.
    • Always replace.

Fig 2: Crankshaft Bearing Cap Bolt Tightening Sequence and Specification

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Tighten the crankshaft bearing cap bolts in sequence -1 through 10- as follows:

1. Tighten the bolts -1 through 10- and the -arrows- by hand.
2. Tighten the bolts -1 through 10- to 65 Nm.
3. Tighten the bolts -1 through 10- an additional 90° (1/4) turn using a ratchet.
4. Tighten the bolts -arrows- to 20 Nm.
5. Tighten the bolts -arrows- an additional 90° (1/4) turn using a ratchet.