Crankshaft Main Bearing: Service and Repair

Lower Bearing Bracket


The upper bearing bracket is bolted to the cylinder with two M8 multipoint bolts, which are found in the valley between the cylinder heads. These bolts must not be loosened under any circumstances, because it causes a deformation of the cylinder block which is no longer reparable.

• Secure the engine to the engine and transmission holder (VAS 6095) when working on it.

Special tools, testers and auxiliary items required

• Clamping Device (T10201)

• Torque Wrench (5-50 Nm) (V.A.G 1331)

• Torque Wrench (40-200 Nm) (V.A.G 1332)

Removing

- Remove the bolts for the lower bearing bracket.

- Install the clamping device (T10201) on the lower bearing bracket as shown.






- Tighten the bolts for the clamping device (T10201) to 20 Nm.

- Remove the lower bearing bracket.

Installing

- Install the clamping device (T10201) on the lower bearing bracket and tighten the bolts to 20 Nm.

- Check whether all bearing shells => [ (Item 4) Bearing Shell ] Description and Operation are lying properly in the bearing supports. Pay attention to the thrust washers => [ (Item 2) Thrust Washer ] Description and Operation.

- Carefully place the lower bearing bracket onto the cylinder block.

Tightening the main bearing bolts.

Main Bearing Bolt Tightening

- Tighten the main bearing bolts in three passes and in the sequence shown as follows (- arrow - points in driving direction).






1 - Tighten using A Torque Wrench:

1st pass = 35 Nm

2nd pass = 65 Nm

2 - Tighten Further using a Ratchet:

3rd pass = 180° (1/2) additional turn