11 21 535 Replacing all crankshafts and bearing shells of the counterbalance shaft (W20)

Necessary preliminary tasks:

Remove bearing frame.

Installation note:

The number and letter combination produces a bearing shell pairing.

Bearing shell (1) with lubricating groove

Bearing shell (2) without lubricating groove.

IMPORTANT: Adhere to bearing position as specified in the table.

Fig 1: Identifying Bearing Shell With/Without Lubricant Groove

Courtesy of BMW OF NORTH AMERICA, INC.

Main bearing classification of crankcase, crankshaft:

Code numbers 1, 2 or 3 are used for the upper section of the crank case.

For the respective bearing seat assignment (2), the code numbers

2 2 2 are printed on the bearing frame.

Main bearing classification of crankcase, counterbalance shaft:

Code numbers 1 or 2 are used for the upper section of the crank case.

For the respective bearing seat assignment (1), the code numbers 1 2 1 are printed on the bearing frame.

For the respective bearing seat assignment (3), the code numbers 2 1 1 are printed on the bearing frame.

Fig 2: Identifying Bearing Frame Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Main bearing classification of bearing frame, crankshaft:

Crankshaft code letters A, B or C are used.

Bearing seat assignment 1 to 3; the first bearing position is located on the actuator drive.

Fig 3: Identifying Crankshaft Code Letters And Bearing Seat Assignment

Courtesy of BMW OF NORTH AMERICA, INC.

Counterbalance shaft bearing frame:

Counterbalance shaft code letters A or B are used.

Bearing seat assignment 1 to 3; the first bearing position is located on the actuator drive side.

Fig 4: Identifying Counterbalance Shaft Code Letters And Bearing Seat Assignment

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

The number and letter combination produces a bearing shell pairing.

IMPORTANT: Engine damage will result if an insufficiently small radial clearance is determined.
If a large radial clearance is determined, this can lead to noise in crankshaft drive.

Code numbers on bearing frame:

Code number 1 = bearing shell (1), yellow, with lubricating groove and without lubricating groove.

Code number 2 = bearing shell (1), brown, with lubricating groove and without lubricating groove.

Code number 3 = bearing shell (1), blue, with lubricating groove and without lubricating groove.

Code letters on the crankshaft:

Code letter A = bearing shell (2), blue, without lubricating groove.

Fig 5: Identifying Bearing Shell With/Without Lubricant Groove

Courtesy of BMW OF NORTH AMERICA, INC.

Code letter B = bearing shell (2), brown, without lubricating groove.

Code letter C = bearing shell (2), yellow, without lubricating groove.

IMPORTANT: Bearing shell (1) with lubricating groove at bearing seat 2.

Fig 6: Identifying Bearing Shell

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Bearing of crankshaft in crankcase (1) .

Installation example: Crankshaft:

Crankcase/bearing frame.

With code number 2 on the bearing frame and code letter A on the crankshaft , a bearing shell with the color brown is required for the upper section of the crankcase and a bearing shell with the color blue is required for the bearing frame .

Fig 7: Identifying Bearing Classification

Courtesy of BMW OF NORTH AMERICA, INC.

For examples, see above.

Bearing 1: 2 and A in brown and blue.

Bearing 2: 2 and A the colors brown with lubricating groove and blue without lubricating groove.

Bearing 3: 2 and A in brown and blue.

CRANKCASE AND BEARING FRAME DESCRIPTION

(1/A) crankcase/yellow	(1/B) crankcase/yellow	(1/C) crankcase/yellow
(1/A) bearing frame/blue	(1/B) bearing frame/brown	(1/C) bearing frame/yellow

(2/A) crankcase/brown	(2/B) crankcase/brown	(2/C) crankcase/brown
(2/A) bearing frame/blue	(2/B) bearing frame/brown	(2/C) bearing frame/yellow

(3/A) crankcase/blue	(3/B) crankcase/blue	(3/C) crankcase/blue
(3/A) bearing frame/blue	(3/B) bearing frame/brown	(3/C) bearing frame/yellow

Installation example: Counterbalance shafts

Crankcase/bearing frame.

Installation note:

Bearing of counterbalance shafts in crankcase (2) .

Fig 8: Identifying Bearing Classification

Courtesy of BMW OF NORTH AMERICA, INC.

With code number 1 on the bearing frame and code letter B on the counterbalance shaft , a bearing shell with the color red is required for the upper section of the crankcase and a bearing shell with the color red is required for the bearing frame .

For examples, see above.

Bearing 1: 1 and B in red and red.

Bearing 2: 2 and B in blue and red.

Bearing 3: 1 and B in red and red.

Bearing 1: 2 and B in blue and red.

Bearing 2: 1 and B in red and red.

Bearing 3: 1 and B in red and red.

CRANKCASE AND BEARING FRAME DESCRIPTION