BMW 7 Series: Replacing Crankshaft (N63)

Notes

IMPORTANT: Weight of crankshaft is approx. 20 kg.

Risk of injury from sharp edge of housing.

Necessary preliminary work

• Remove ENGINE
• Mount engine on assembly stand
• Remove cylinder head
• Remove HUB FOR VIBRATION DAMPER
• Removing LOWER TIMING CASE COVER
• Removing oil pan
• Remove OIL PUMP
• Removing PISTON
• 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. 117: Locating Main Bearing Caps Numbers

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

Fig. 118: Identifying Main Bearing Caps Numbers

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

Fig. 119: Removing Oil Pump Spacer Bolts With Special Tool 13 5 020

Release main bearing taper screw connection (1).

Release oil pump spacer pins (2).

Fig. 120: Identifying Main Bearing Taper Screw Connection And Oil Pump Spacer Pins

Release all threaded support sleeves (1).

Fig. 121: Removing Threaded Support Sleeves

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

Fig. 122: Identifying Collar Bolts (M8) Releasing Sequence

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. 123: Identifying Collar Bolts (M11) Releasing Sequence

Release screw for oil nozzle (1).

Tightening torque: 11 11 8 AZ.

Fig. 124: Identifying Oil Nozzle

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

Observe fastening on oil nozzle.

Fig. 125: Locating Fastening On Oil Nozzle

Installation note: Observe fastening in crankcase.

Fig. 126: Locating Fastening In Crankcase

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. 127: Locating Main Bearing Caps Numbers

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.

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

Fig. 128: Identifying Main Bearing Caps Numbers

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. 129: Identifying Collar Bolts (M11) Tightening Sequence

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. 130: Identifying Collar Bolts Head Mark

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

Tightening torque: 11 11 1AZ.

Fig. 131: Securing Collar Bolt With Special Tool 00 9 120

Insert all collar bolts (M8) hand-tight.

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

Fig. 132: Identifying Collar Bolts (M8) Tightening Sequence

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. 133: Identifying Collar Bolts Head Mark

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

Fig. 134: Securing Collar Bolt With Special Tool 00 9 120

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

Tightening torque: 11 11 3 AZ.

Fig. 135: Securing All Threaded Support Sleeves With Special Tool 11 4 350

Secure main bearing taper screw connection (1).

Tightening torque: 11 11 4 AZ.

Fig. 136: Identifying Main Bearing Taper Screw Connection And Oil Pump Spacer Pins

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. 137: Checking Crankshaft Breakaway Torque With Special Tool 00 2 010

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. 138: Checking Axial Play

Assemble engine.

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