11 21 531 Replacing all main crankshaft bearing shells (M57T2)

Necessary preliminary tasks:

Remove engine
Remove CYLINDER HEAD .
Remove TIMING CASE at front
Remove RADIAL SHAFT SEAL at rear
Remove OIL PUMP

IMPORTANT: Replace main bearing screws.
Do not wash off bolt coating.

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

IMPORTANT: Check grinding size of crankshaft.

Fig 1: Locating Grinding Stage Of Crankshaft

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Installation

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: Identifying Bearing Shells

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NOTE: The axial guide on the crankshaft is fitted to bearing point 6.

Insert pilot bearing shell in the engine block.

Fig 3: Identifying Guide Bearing Shell

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

Fig 4: Locating Marks On Crankshaft

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Installation

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

Fig 5: Locating Mark On Bearing Shell

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

Bearing shell
Guide bearing

Observe grinding stage of main bearing journals.

Fig 6: Locating Bearing Shell Marks

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NOTE: Main bearing caps 1 to 5 are marked on exhaust side.
The main bearing caps 6 and 7 are not marked.
Main bearing cap 6 is a guide bearing.

Fig 7: Identifying Main Bearing Cap

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Check clearance on main crankshaft bearing.

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

Do not twist crankshaft.

Fig 8: Locating Main Bearing Clearance Of 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.

NOTE: To check main bearing clearance, use the old main bearing screws.
Wash and oil main bearing bolts.

Fig 9: Locating Grooves On Main Bearing Shell Guide

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Tightening specifications for main bearing:

Tighten screws to torque.
Tighten down bolts with special tool 00 9 120 to angle of rotation.
Tightening torque, see 11 11 1AZ in 11 11 ENGINE BLOCK

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

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

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

Fig 11: Locating Radial Clearance Reading On Width Of Flattened Plastic Thread

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Summary:

Colour code/shaft diameter/bearing strength

Ge = yellow
Gn = green
Ws = white

Crankshaft
Bearing clearance
Bearing shells: Yellow, green, white
Bearing cover

Fig 12: Identifying Bearing Clearance

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NOTE: Remove plastic thread.
Coat main bearing shells and crankshaft with engine oil.

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 Grooves On Main Bearing Shell Guide

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Tightening specifications for main bearing:

Tighten all screws on main bearing cover with jointing torque.
Unfasten screws on main bearing cover 4.
Strike back and front of crankshaft with plastic hammer to center guide bearing (do not damage crankshaft).
Tighten screws of main bearing cover 4 with jointing torque.
Tighten down all screws on main bearing caps with special tool 00 9 120 to angle of rotation.
Tightening torque, see 11 11 1AZ in 11 11 ENGINE BLOCK

Fig 14: Tightening Main Bearing Screw Using Special Tool (00 9 120)

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Check axial play.

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

Fig 15: Checking Axial Play

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Assemble engine.