11 21 500 Replacing crankshaft (N63)

Special tools required: 

• 00 2 010
• 00 9 120
• 11 4 350
• 11 6 251
• 11 6 252
• 13 5 020

Necessary preliminary work: 

• Remove engine. See 11 00 050 REMOVING AND INSTALLING/REPLACING ENGINE (N63) .
• Mount engine on assembly stand. See 11 00 MOUNTING ENGINE ON ASSEMBLY STAND (N63) .
• Remove cylinder head.
• Remove HUB FOR VIBRATION DAMPER 
• Removing lower timing case cover
• Removing oil pan. See 11 13 020 REMOVING AND INSTALLING/REPLACING LOWER OIL SUMP SECTION (N63) and 11 13 010 REMOVING AND INSTALLING/REPLACING UPPER OIL SUMP SECTION (N63)
• Remove OIL PUMP
• Removing PISTONS 
• Remove FLYWHEEL 
• Remove radial shaft seals. See 11 14 141 REPLACING RADIAL SHAFT SEAL IN LOWER TIMING CASE COVER (N63) and 11 14 151 REPLACING CRANKSHAFT RADIAL SEAL ON TRANSMISSION SIDE (N63) .
• Remove TIMING CHAINS

Installation note: 

Layout of main bearing caps.

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

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 threaded support sleeves (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 (N63)

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

Remove main bearing caps 1 to 5.

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

Fig 7: Crankshaft Bolts (M11) Tightening/Loosening Sequence (N63)

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Release screw for oil nozzle (1).

Tightening torque: 11 11 8 AZ .

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 in illustration).

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 threaded support sleeves hand-tight.

Installation note: 

Coat all bearing positions with engine oil.

Install crankshaft.

Fit bearing caps (1 to 5).

Fig 12: Identifying Main Bearing Caps

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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 (N63)

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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 (N63)

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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 3 AZ .

Fig 19: Securing Threaded Support Sleeves Using Special Tool 11 4 350

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Secure main bearing taper screw connection (1).

Tightening torque: 11 11 4 AZ .

Secure oil pump spacer pins (2).

Tightening torque: 11 11 5 AZ .

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. See N63 ENGINE .

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. See N63 ENGINE .

Fig 22: Checking Crankshaft Axial Play

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Assemble engine.