11 21 500 Replacing crankshaft (S63)

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Special tools required:

IMPORTANT: Weight of crankshaft is approx. 20 kg.
Risk of injury from sharp crankcase edges.

Necessary preliminary work:

Remove engine. See REMOVING ENGINE FROM FRONT AXLE (M6, DUAL-CLUTCH TRANSMISSION) or REMOVING ENGINE FROM FRONT AXLE (M6, MANUAL TRANSMISSION) .
Mount engine on ASSEMBLY STAND .
Remove both cylinder heads. See REMOVING LEFT CYLINDER HEAD and REMOVING RIGHT CYLINDER HEAD .
Remove HUB FOR VIBRATION DAMPER
Remove OIL PUMP
Take off UPPER PART OF OIL SUMPS
Remove LOWER GEAR CASE COVER
Remove PISTONS
Remove FLYWHEEL
Remove RADIAL SHAFT SEALS
Remove TIMING CHAINS

Installation note:

Layout of main bearing caps.

All numbers must be read from the cylinder bank (5 to 8) (see arrows).

Fig 1: Identifying Main Bearing Caps

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Main bearing caps (1 to 5) opposite the output end on the timing chain drive.

Fig 2: Identifying Main Bearing Caps

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Release oil pump spacer bolts (1) with special tool 13 5 020 .

Fig 3: Releasing Oil Pump Spacer Bolts

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Release main bearing taper screw connection (1).

Release oil pump spacer pins (2).

Fig 4: Identifying Oil Pump Spacer Pins And Main Bearing Taper Screw Connection

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Release all thread support bushings (1).

Fig 5: Identifying Threaded Support Sleeves

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Release collar bolts (M8) in sequence 10 to 1.

Fig 6: Crankshaft Bolts (M8) Tightening/Loosening Sequence (S63)

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Release collar bolts (M11) in sequence 10 to 1.

Remove main bearing caps 1 to 5.

IMPORTANT: Remove crankshaft with a 2nd person, weight approx. 25 kg.

Lift out crankshaft and set down safely (secure against turning).

Fig 7: Crankshaft Bolts (M11) Tightening/Loosening Sequence (S63)

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Release screw for oil nozzle (1).

Tightening torque: 11 11 8AZ .

Fig 8: Identifying Screw For Oil Nozzle

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Installation note:

Check oil nozzle (1) for clear passage with compressed air.

Observe fastening on oil nozzle.

Fig 9: Locating Oil Nozzle

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Installation note:

Observe fastening in crankcase.

Fig 10: Identifying Installed Oil Nozzle

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Replace CRANKSHAFT MAIN BEARING SHELLS .

Installation note:

Observe arrangement of main bearing caps.

All numbers must be read from the cylinder bank (5 to 8) (see arrows).

Fig 11: Identifying Main Bearing Caps

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Main bearing caps (1) is opposite the output end on the timing chain drive.

Turn back all thread support bushings hand-tight.

Installation note:

Coat all bearing points with engine oil.

IMPORTANT: Install crankshaft with a 2nd person, weight approx. 25 kg.

Install crankshaft.

Fig 12: Identifying Main Bearing Caps

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Fit bearing caps (1 to 5).

Set down bearing caps positioned from 1 to 5.

Insert all collar bolts (M11) hand-tight.

Secure collar bolts (M11) in sequence (1 to 10).

Fig 13: Crankshaft Bolts (M11) Tightening/Loosening Sequence (S63)

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Installation note:

For a better overview of the screw connection quality, mark the head of all collar bolts after joining with a line (1) using an oil-proof marker pen.

Check angle tightening.

Fig 14: Identifying Mark On Collar Bolt Heads

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Secure collar bolt (1) with special tool 00 9 120 .

Tightening torque: 11 11 1AZ .

Fig 15: Tightening Collar Bolts Of Main Bearing Caps

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Insert all collar bolts (M8) hand-tight.

Secure collar bolts (M8) in sequence (1 to 10).

Fig 16: Crankshaft Bolts (M8) Tightening/Loosening Sequence (S63)

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Installation note:

For a better overview of the screw connection quality, mark the head of all collar bolts after joining with a line (1) using an oil-proof marker pen.

Check angle tightening.

Fig 17: Identifying Mark On Collar Bolt Heads

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Secure collar bolt (1) with special tool 00 9 120 .

Fig 18: Securing Collar Bolt

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Secure all threaded support sleeves (1) with special tool 11 4 350 .

Tightening torque: 11 11 3AZ .

Fig 19: Securing Threaded Support Sleeves

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Secure main bearing taper screw connection (1).

Tightening torque: 11 11 4AZ .

Secure oil pump spacer pins (2).

Tightening torque: 11 11 5AZ .

Fig 20: Identifying Oil Pump Spacer Pins And Main Bearing Taper Screw Connection

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Check crankshaft COEFFICIENT OF FRICTION .

Determine crankshaft breakaway torque with special tool 00 2 010 .

Rotate crankshaft at central bolt using special tool 00 2 010 .

If the breakaway torque is too high, it will be necessary to correct the BEARING CLEARANCE .

Fig 21: Rotating Crankshaft Central Bolt Using Special Tool 00 2 010

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Secure special tool 11 6 252 to crankcase with magnetic base.

Slide crankshaft in direction of arrow forwards as far as it will go.

Set special tool 11 6 251 to zero.

Slide crankshaft (1) in direction of arrow towards rear and determine value.

Check AXIAL PLAY .

Fig 22: Checking Axial Play

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Assemble engine.