11 21 531 Replace all crankshaft main bearing shells (M57T2-SCR)

Special tools required: 

• 00 2 590
• 00 9 120

Necessary preliminary work: 

• Remove ENGINE 
• Remove CYLINDER HEAD .
• Remove THE GEAR CASE  at front
• Remove RADIAL SHAFT SEAL  at rear
• Remove OIL PUMP 

Fig 1: Locating Grinding Stage Mark Of Crankshaft

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Installation note: 

When exchanging bearing shells (also exchange crankshafts), classification of bearing shell allocation in the crankcase is discontinued.

Only fit yellow  bearing shells into the crankcase.

Fig 2: Locating Yellow Bearing Shells Into Crankcase

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Fig 3: Identifying Guide Bearing Shell In Engine Block

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The crankshaft is marked with yellow, green or white paint, depending on the tolerance of the main bearing journal.

Fig 4: Locating Crankshaft Marks

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Installation note: 

The bearing shell classification for the bearing cap is marked on the crankshaft in yellow, green or white paint.

Fig 5: Locating Bearing Shell

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The bearing shells are marked with yellow, green or white paint.

1. Bearing shell
2. Guide bearing

Observe grinding stage of main bearing journals. See 1121 CRANKSHAFT AND BEARINGS (M57T2, TOP/SCR, D30) .

Fig 6: Locating Bearing Shell And Guide Bearing

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Main bearing cap 6 is a guide bearing.

Fig 7: Identifying Main Bearing Cap 6 In Guide Bearing

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Check the main bearing clearance on the crankshaft.

Install crankshaft, fit special tool 00 2 590 (Plastigage type PG1) on the oil-free crankshaft.

Do not twist crankshaft.

Fig 8: Checking Main Bearing Clearance On Crankshaft

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Install main bearing cap so that grooves in main bearing shell guide are on one side.

Align main bearing cap flush with side of bearing seat.

Fig 9: Locating Main Bearing Shell Guide Grooves

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Tightening specifications for main bearing:

1. Tighten screws to jointing torque.
2. Tighten down bolts with special tool 00 9 120 to angle of rotation.

   Tightening torque: 11 11 1AZ .

   Fig 10: Tightening Main Bearing Bolts Using Special Tool 00 9 120

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Remove main bearing cap and read off radial clearance at width of flattened plastic thread (Plastigage) with assistance of measuring scale.

If necessary, to correct bearing clearance, fit new bearing shells with a different color coding.

Fig 11: Checking Main Bearing Cap Radial Clearance

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Overview:

Color code/shaft diameter/bearing strength

• Ge = yellow
• Gn = green
• Ws = white

1. Crankshaft
2. Bearing clearance
3. Bearing shells: Yellow, green, white
4. Bearing cap
   Fig 12: Identifying Color Code/Shaft Diameter/Bearing Strength

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Install main bearing cap so that grooves in main bearing shell guide are on one side.

Align main bearing cap flush with side of bearing seat.

Fig 13: Locating Main Bearing Shell Guide Grooves

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Tightening specifications for main bearing:

1. Tighten all screws on main bearing cap with jointing torque.
2. Loosen the screws on the main bearing cap 4.
3. Strike back and front of crankshaft with plastic hammer to center guide bearing (do not damage crankshaft).
4. Tighten bolts of main bearing cap no. 4 to jointing torque.
5. Tighten down all screws on main bearing caps with special tool 00 9 120 to angle of rotation.

   Tightening torque: 11 11 1AZ .

   Fig 14: Tightening Screws On Main Bearing Cap

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Check side clearance. See 1121 CRANKSHAFT AND BEARINGS (M57T2, TOP/SCR, D30) .

If necessary, check guide bearing shells, crankshaft and engine block.

Fig 15: Checking Guide Bearing Shells Side Clearance

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Assemble engine.