Necessary preliminary work

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Remove ENGINE
Mount engine on assembly stand
Remove cylinder head. See LEFT CYLINDER HEAD and RIGHT CYLINDER HEAD .
Remove HUB FOR VIBRATION DAMPER
Removing LOWER TIMING CASE COVER
Removing oil pan See 1113020 REMOVING AND INSTALLING/REPLACING LOWER OIL SUMP SECTION (N63) and 1113010 REMOVING AND INSTALLING/REPLACING UPPER OIL SUMP SECTION (N63)
Remove OIL PUMP
Removing PISTON
Remove FLYWHEEL
Remove radial shaft seals. See RADIAL SHAFT SEAL IN LOWER TIMING CASE COVER and CRANKSHAFT RADIAL SEAL ON TRANSMISSION SIDE
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: Locating Main Bearing Caps Numbers

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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 Numbers

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

Fig 3: Removing Oil Pump Spacer Bolts With Special Tool 13 5 020

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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 threaded support sleeves (1).

Fig 5: Removing Threaded Support Sleeves

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

Fig 6: Identifying Collar Bolts (M8) Releasing 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: Identifying Collar Bolts (M11) Releasing Sequence

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Release screw for oil nozzle (1).

Tightening torque: 11 11 8 AZ .

Fig 8: Identifying 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 Fastening On Oil Nozzle

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Installation note:

Observe fastening in crankcase.

Fig 10: Locating Fastening In Crankcase

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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: Locating Main Bearing Caps Numbers

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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.

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

Fig 12: Identifying Main Bearing Caps Numbers

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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 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 Collar Bolts Head Mark

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

Tightening torque: 11 11 1AZ .

Fig 15: Securing Collar Bolt 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 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 Collar Bolts Head Mark

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

Fig 18: Securing Collar Bolt With Special Tool 00 9 120

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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 All Threaded Support Sleeves With 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 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 using special tool 00 2 010 .

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

Fig 21: Checking Crankshaft Breakaway Torque With 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 ENGINE - TECHNICAL DATA -- 750LI .

Fig 22: Checking Axial Play

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Assemble engine.