11 21 500 Replacing crankshaft (M57T2)

Necessary preliminary tasks:

IMPORTANT: Replace main bearing and conrod bearing bolts.
Replace main bearing and conrod bearing shells.

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

Release screws.

Remove reinforcement shell (1).

Fig 1: Locating Reinforcement Shell Screws

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Check crankshaft axial clearance.

Axial clearance. See appropriate CRANKSHAFT AND BEARINGS in ENGINE - TECHNICAL DATA

If the permitted axial clearance is exceeded:

Fig 2: Checking Crankshaft Axial Clearance

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Release screw connections on main bearing from outside to inside.

Remove main bearing caps 1...7.

IMPORTANT: Remove camshaft and carefully place to one side.

Fig 3: Identifying Main Bearing Caps

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NOTE: Bearing caps 1...5 are marked on exhaust side.
Bearing caps 6 and 7 are not marked.
Bearing cap 6 is installed as a guide bearing.

IMPORTANT: Pay attention to oil hole in bearing shell.
Pay attention to installation position of crankshaft bearing shells.

Fig 4: Identifying Main Bearing Cap

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Installation:

Coat bearing shells with oil.

Install crankshaft.

Fit bearing caps 1...7 so that grooves of bearing shell guide are on one side.

Align bearing cap exactly.

Fig 5: 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 6.
Strike back and front of crankshaft with plastic hammer to center thrust bearing (do not damage crankshaft).
Tighten screws of main bearing cover 6 with jointing torque.
Tighten down all screws on main bearing caps with special tool 00 9 120 to angle of rotation.
Tightening specification, see 11 11 1AZ in 11 11 ENGINE BLOCK

Fig 6: Tightening Main Bearing Screw Using Special Tool (00 9 120)

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Check axial play See appropriate CRANKSHAFT AND BEARINGS in ENGINE - TECHNICAL DATA

Fig 7: Checking Axial Play

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Assemble engine.