11 21 531 Replacing All Main Crankshaft Bearing Shells (N62/N62TU)

Special tools required: 

• 00 2 590
• 00 9 120

Necessary preliminary tasks: 

• (engine dismantled)
• Clean components before installing.
• Preparatory tasks are described in the section REPLACING CRANKSHAFT .

Fig 1: Identifying Main Bearing Shells

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The letter (1) denotes the crankshaft construction stage.

S= Series

B= Construction stage 1

C= Construction stage 2

The numbers (2) denote the bearing shell classification for the relevant bearing position from 1 to 5 (main bearing cap).

1= yellow

2= green

3= violet

Fig 2: Identifying Crankshaft Construction Stage And Bearing Shell Classification

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The letters (1) denote the bearing shell classification for the relevant bearing position from 1 to 5 in the crankcase and is located on the transmission side in the Vee. The first letter on the left applies to the first bearing position at the front.

Y= yellow

G= green

V= violet

Fig 3: Identifying Bearing Shell Classification Letters

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Fig 4: Identifying Main Bearing Caps

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Fig 5: Identifying Thrust Bearing Stop Disk Surface

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Unscrew thread support bushings in main bearing caps.

Fig 6: Identifying Main Bearing Cap

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Checking main bearing clearance: 

To check crankshaft bearing clearance, use old main bearing screws.

There must be no oil in the blind holes (risk of cracking).

Do not twist crankshaft.

Fit special tool 00 2 590 (Plastigage Type PG 1) to the oilfree crankshaft.

Fig 7: Identifying Crankshaft Holes

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1. Tighten all screws on main bearing cover with jointing torque.
2. Tighten down all screws on main bearing caps with special tool 00 9 120 and torsion angle.

   Tightening torque: 11 11 2AZ  . See ENGINE BLOCK, CYLINDER CRANKCASE for specs.

   Fig 8: Identifying Special Tool

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   Remove main bearing cap.

   Read off main bearing play at width of flattened plastic thread with assistance of measurement scale.

   MAIN BEARING PLAY .

   • Remove plastic thread.
   • Lubricate bearing shells and bearing shells.
     Fig 9: Checking Main Bearing Play

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Tightening specifications for main bearing:

1. Tighten all screws on main bearing cover with jointing torque.
2. Unfasten screws on main bearing cover 5.
3. Strike back and front of crankshaft with plastic hammer to center thrust bearing (do not damage crankshaft).

   CHECK AXIAL PLAY .

   Check guide bearing shell, crankshaft and crankcase if necessary.

4. Tighten screws of main bearing cover 5 with jointing torque.
5. Tightening torque: 11 11 2AZ  . See ENGINE BLOCK, CYLINDER CRANKCASE for specs.
   Fig 10: Checking Axial Play

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   Tighten down all screws on main bearing caps with special tool 00 9 120 and torsion angle.

   Tightening torque: 11 11 2AZ  . See ENGINE BLOCK, CYLINDER CRANKCASE for specs.

   Tighten down thread support bushings (2).

   Tightening torque: 11 11 3AZ  . See ENGINE BLOCK for specs.

   Fig 11: Identifying Main Bearing Cap Screws

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   Replace flanged head screws (1) and tighten down.

   Tightening torque: 11 11 3AZ  . See ENGINE BLOCK for specs.

   Fig 12: Identifying Head Screws

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