11 21 500 Replacing crankshaft (N57 Diesel)

WARNING: This page does not describe the selected car, but rather 50 other vehicles, including the 2016 BMW M5, 2016 BMW ActiveHybrid 5, 2016 BMW 550i xDrive, 2016 BMW 550i, and 2016 BMW 535i xDrive. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

IMPORTANT: Replace main and connecting rod bolts.
There must be no oil in the blind holes (risk of cracking) .
Do not wash off bolt coating.
Incorrect installation of the bearing caps will result in damage to the crankcase.

Necessary preliminary tasks:

Remove ENGINE .
Remove OIL PUMP .
Remove END COVER at rear.
REMOVING ALL PISTONS .

Remove both TIMING CHAINS .

NOTE: Bearing caps 1...7 are marked on the intake end.
Bearing cap 4 is installed as a thrust bearing.
Graphic at bearing seat number 2.

Release main bearing screw connections in sequence 14 to 1 on main bearing caps.

Fig 1: Main Bearing Cap Bolts Tightening/Loosening Sequence (N57)

Courtesy of BMW OF NORTH AMERICA, INC.

Remove main bearing caps 1...7.

Fig 2: Identifying Bearing Caps

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: With the assistance of a second person, remove crankshaft and carefully place to one side.
Pay attention to oil hole in bearing shell.
Pay attention to installation position of CRANKSHAFT MAIN BEARING SHELLS .

Fig 3: Identifying Bearing Caps

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Lubricate all bearing shells.

Install crankshaft.

Fit bearing caps 1 to 7 in such a way that the identification numbers always face towards the intake side .

Both locating grooves of bearing shells in crankcase and on bearing cap must be mounted on one side.

IMPORTANT: The crankcase will be damaged if the bearing caps are installed incorrectly or in the wrong position.

Damage to molding on crankcase.

Align all bearing caps.

Fit main bearing bolts.

Tighten main bearing bolts in sequence (1 to 14) (follow bolt tightening specifications).

Tightening torque: 11 11 1AZ .

Join all main bearing bolts (1) in sequence 1 to 14 with a torque wrench (2).

Fig 4: Main Bearing Cap Bolts Tightening/Loosening Sequence (N57)

Courtesy of BMW OF NORTH AMERICA, INC.

Tightening torque: 11 11 1AZ .

Fig 5: Identifying Main Bearing Bolts And Torque Wrench

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

To visually check the main bearing bolts, apply a marking (1) to the bolt head after joining the main bearing bolts for the first time.

Mark all main bearing bolts with a colored line (1) in the same axial direction.

Join all main bearing bolts in sequence 1 to 14 (second joining).

Tightening torque: 11 11 1AZ .

Visually check main bearing bolts.

Fig 6: Identifying Colored Lines In Axial Direction Across Heads Of Main Bearing Bolts

Courtesy of BMW OF NORTH AMERICA, INC.

Secure main bearing bolts with special tool 00 9 120 .

Tightening torque: 11 11 1AZ .

Visually check main bearing bolts.

Fig 7: Securing Main Bearing Bolts Using Special Tool (00 9 120)

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

If the screw connection at the main bearing bolts is concluded, check the colored lines.

All colored lines on the main bearing bolts must point in the same direction.

Fig 8: Verifying Direction Of Colored Lines On Heads Main Bearing Bolts

Courtesy of BMW OF NORTH AMERICA, INC.

Secure special tool 11 6 252 to bearing seat (7) with magnet.

Alternately slide crankshaft (2) in direction of arrow onto block.

Set special tool 11 6 251 to zero.

Check side clearance.

Fig 9: Checking Side Clearance Using Special Tools

Courtesy of BMW OF NORTH AMERICA, INC.

Determining crankshaft breakaway torque:

Insert all vibration damper bolts (1) by hand.

Rotate crankshaft in direction of arrow with special tool 00 2 010 in conjunction with special tool 11 6 480 .

Friction coefficient of crankshaft.

Fig 10: Rotating Crankshaft

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.