11 21 500 Replacing crankshaft (N63)

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Special tools required:

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

See MAINTENANCE AND GENERAL INFORMATION - SPECIAL TOOLS .

See ENGINE - SPECIAL TOOLS (N54, N63) .

See FUEL SYSTEM - SPECIAL TOOLS .

IMPORTANT: Weight of crankshaft is approx. 20 kg.

Risk of injury from sharp crankcase edges.

Necessary preliminary tasks:

Remove engine .
Mount engine on assembly stand .
Remove cylinder head .
Remove hub for vibration damper .
Remove lower timing case cover.
Remove oil sump .
Remove oil pump .
Remove pistons .
Remove flywheel .
Remove radial shaft seals .
Remove timing chains .

Installation:

Layout of main bearing caps.

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

Fig 1: Numbers Must Be Read From The Cylinder Bank (5 To 8)

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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 pins (1) with special tool 13 5 020.

Fig 3: Release Oil Pump Spacer Pins

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Release main bearing taper screw connection (1).

Release oil pump spacer pins (2).

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

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Release all thread support bushings (1).

Fig 5: Identifying Thread Support Bushings

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

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

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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

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Release screw for oil nozzle (1).

Tightening torque: 11 11 8AZ, see 11 11 ENGINE BLOCK

Fig 8: Identifying Oil Nozzle Screw

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Installation:

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

Observe fastening on oil nozzle.

Fig 9: Identifying Oil Nozzle

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Installation:

Observe fastening in crankcase.

Fig 10: Identifying Crankcase Fastening

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Replace main crankshaft bearing shells .

Installation:

Observe arrangement of main bearing caps.

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

Fig 11: Identifying Arrangement Of 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:

Coat all bearing points with engine oil.

Fig 12: Identifying Main Bearing Caps

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

Install crankshaft.

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

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Installation:

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 Collar Bolts

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

Tightening torque: 11 11 1AZ, see 11 11 ENGINE BLOCK

Fig 15: Secure Collar Bolt (1) With Special Tool 00 9 120

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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

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Installation:

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 Collar Bolts

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

Fig 18: Identifying Collar Bolt With Special Tool

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Secure all thread support bushings (1) with special tool 11 4 350.

Tightening torque: 11 11 3AZ, see 11 11 ENGINE BLOCK

Fig 19: Tightening Support Bushings With Special Tool

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Secure main bearing taper screw connection (1).

Tightening torque: 11 11 4AZ, see 11 11 ENGINE BLOCK

Secure oil pump spacer pins (2).

Tightening torque: 11 11 5AZ, see 11 11 ENGINE BLOCK

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

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Check crankshaft coefficient of friction .

Determine crankshaft breakaway torque with special tool 00 2 010.

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

If the breakaway torque is too high, it will be necessary to correct the bearing clearance . See CRANKSHAFT WITH BEARING .

Fig 21: Rotating Crankshaft Central Bolt With Special Tool

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Secure special tool 11 6 252 with magnetic foot on crankcase.

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 Crankshaft End Play

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Assemble engine.