11 24 571 Replacing all connecting rod bearing shells (N20)

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:

00 2 590 .
00 9 120 .
83 30 0490 190
83 30 0 490 504

IMPORTANT: Modified procedure:
All crank pins are connected with the crankshaft.
The Blue/Red connecting rod bearing shell colors are no longer fitted in combination.

Necessary preliminary tasks:

Remove oil sump. See OIL SUMP (RWD) or OIL SUMP (AWD) .

IMPORTANT: All crankshaft crank pins are classified.
The identification (2) is located on the first crank web.
The first code letter (2) from the left is the first cylinder towards the control chain side

Optional classifications (2) per connecting rod

On the connecting rod and connecting rod bearing cap:

r. Connecting rod = Yellow.

Connecting rod bearing cap = Red.

b. Connecting rod = Violet.

Connecting rod bearing cap = Blue

Fig 1: Identifying Main Bearing Classification ID Codes And Code Letters For Crankcase Lower Section

Courtesy of BMW OF NORTH AMERICA, INC.

Example:

Possible classification: b r r r

Cylinder 1: Classification b

Violet (connecting rod)/\Blue (connecting rod bearing cap)

Cylinder 2: Classification r

Yellow (connecting rod)/Red (connecting rod bearing cap)

Cylinder 3: Classification r

Yellow (connecting rod)/Red (connecting rod bearing cap)

Cylinder 4: Classification r

Yellow (connecting rod)/Red (connecting rod bearing cap)

Release connecting rod bolts (1).

Remove connecting rod bearing cap (2).

Fig 2: Identifying Connecting Rod Bearing Cap And Bolts

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Risk of damage to cylinder wall and to crankshaft.

Gently release connecting rod from crankshaft.

Remove connecting rod bearing shells (1 and 2).

Use new connecting rod bearing shells according to code letter.

Installation note:

Pay attention to guide lugs during installation.

Fig 3: Identifying Connecting Rod Bearing Shells

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: All crankshaft crank pins are classified.

If the connecting-rod bearing must be checked:

Piston in BDC position.

To determine the connecting rod bearing play, make sure that the bearing positions are clean and free from oil and grease.

Fit special tool 00 2 590 (Plastigage type PG 1) to oil-free crankshaft.

Fit connecting rod bearing cap so that pairing letters match up.

Order number: 83 30 0490 190

Fig 4: Fitting Bearing Cap

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Do not distort connecting rods or crankshaft.

It is possible to use the old connecting rod bolts if the connecting-rod bearing play requires checking.

Tighten down connecting rod bolts with special tool 00 9 120 .

Tightening torque 11 24 1AZ .

Order number: 83 30 0 490 504

Fig 5: Tightening Connecting Rod Bolts Using Special Tool (00 9 120)

Courtesy of BMW OF NORTH AMERICA, INC.

Unscrew connecting rod bearing cap. Read off connecting rod bearing play at width of flattened Plastigage on measurement scale.

CONNECTING ROD BEARING PLAY .

Remove Plastigage
Coat crankshaft and connecting rod bearing shells with oil
Install new connecting rod bolts and tighten down with special tool 00 9 120 .

Fig 6: Measuring Radial Clearance
Courtesy of BMW OF NORTH AMERICA, INC.

Tightening torque 11 24 1AZ .

Assemble engine.