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11 21 531 Replacing all crankshaft main bearings (N12)

WARNING: This page is about a different variant/trim than selected.

Special tools required: 

IMPORTANT: Modified assignment of bearings.
Bearing (1) is at the output end (clutch end)
Determine main bearing colors; the designations on the crankcase and crankshaft are always required and can only determined using the table.

Necessary preliminary tasks: 

Installation: 

Bearing shell (1) with lubricant groove must be fitted in crankcase upper section.

Bearing shell (2) without lubricant groove must be fitted in crankcase lower section (bedplate).

Fig 1: Identifying Bearing Shells
G04725449Courtesy of BMW OF NORTH AMERICA, INC.
IMPORTANT: Modified assignment of bearings.
Bearing (1) is at the output end (clutch end)

Bearings (1 to 5).

Bearing (2) is a guide bearing.

IMPORTANT: Clean sealing surfaces.
Do not  clean sealing faces with a metal-cutting tool.

Clean sealing faces with special tool 11 4 470 only.

Fig 2: Identifying Bearings
G05515529Courtesy of BMW OF NORTH AMERICA, INC.

Insert guide rings (1) in crankcase at bearing block (2) with groove facing outwards.

If necessary, attach with engine oil to crankcase.

Fig 3: Identifying Guide Rings
G05515530Courtesy of BMW OF NORTH AMERICA, INC.
IMPORTANT: Modified assignment of bearings.
Bearing (1) is at the output end (clutch end)

Bearings (1 to 5).

IMPORTANT: Clean sealing surfaces.

Do not  clean sealing faces with a metal-cutting tool.

Clean sealing faces with special tool 11 4 470 only.

Fig 4: Identifying Bearings
G05515531Courtesy of BMW OF NORTH AMERICA, INC.

Bearing classification on crankcase upper half: 

Bearing allocation 1-5: the designations on the crankcase and crankshaft are always required.

Refer to the table for the color code.

Example: 

Bearing 1. Letter P

Bearing 2. Letter K

Bearing 3. Letter I

Bearing 4. Letter N

Bearing 5. Letter N

Fig 5: Identifying Code (1 Of 6)
G05515532Courtesy of BMW OF NORTH AMERICA, INC.

Bearing classification on crankcase upper half: 

Bearing allocation 1-5: the designations on the crankcase and crankshaft are always required. 

Refer to the table for the color code.

Example: 

Bearing 1. Letter T

Bearing 2. Letter Q

Bearing 3. Letter Q

Bearing 4. Letter R

Bearing 5. Letter R

Fig 6: Identifying Code (2 Of 6)
G05515533Courtesy of BMW OF NORTH AMERICA, INC.
BEARING SPECIFICATION

Table overview of bearing classification: upper half
Identifying letter of crankshaft
Bearings 1-5 A B C d E G H I K M N P Q R S T U
Crankcase  A  Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw Sw Sw Sw Bl Bl Bl Bl
B  Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw Sw Sw Sw Bl Bl Bl
C  Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw Sw Sw Sw Bl Bl
D  Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw Sw Sw Sw Bl
E  Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw Sw Sw Sw
G  Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw Sw Sw
H  Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw Sw
I  Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw
K  Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw
M  Ge Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw
N  Ge Ge Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw
P  Ge Ge Ge Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw
Q  Or Ge Ge Ge Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr
R  Or Or Ge Ge Ge Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr
S  Or Or Or Ge Ge Ge Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr
T  Or Or Or Or Ge Ge Ge Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr
U  Or Or Or Or Or Ge Ge Ge Ge Ge Ge Ge Ge Gr Gr Gr Gr
X  Or Or Or Or Or Or Ge Ge Ge Ge Ge Ge Ge Ge Gr Gr Gr
Y  Or Or Or Or Or Or Or Ge Ge Ge Ge Ge Ge Ge Ge Gr Gr
Z  Or Or Or Or Or Or Or Or Ge Ge Ge Ge Ge Ge Ge Ge Gr
Crankshaft bearing colors:
BL= Blue.
SW=Black.
Gr= Green.
Ge Yellow.
Or Orange.

Bearing classification on crankcase lower half: 

Bearing allocation 1-5: the designations on the crankcase and crankshaft are always required.

Refer to the table for the color code.

Example: 

Bearing 1. Letter P

Bearing 2. Letter K

Bearing 3. Letter I

Bearing 4. Letter N

Bearing 5. Letter N

Fig 7: Identifying Code (3 Of 6)
G05515532Courtesy of BMW OF NORTH AMERICA, INC.

Bearing classification on crankcase lower half: 

Bearing allocation 1-5: the designations on the crankcase and crankshaft are always required.

Refer to the table for the color code.

Example: 

Bearing 1. Letter T

Bearing 2. Letter Q

Bearing 3. Letter Q

Bearing 4. Letter R

Bearing 5. Letter R

Fig 8: Identifying Code (4 Of 6)
G05515533Courtesy of BMW OF NORTH AMERICA, INC.
BEARING SPECIFICATION

Table overview of bearing classification: lower half
Crankshaft
Bearings 1-5 A B C d E G H I K M N P Q R S T U
Crankcase  A  Gr Sw Sw Sw Sw Sw Sw Sw Sw Bl Bl Bl Bl Bl Bl Bl Bl
B  Gr Gr Sw Sw Sw Sw Sw Sw Sw Sw Bl Bl Bl Bl Bl Bl Bl
C  Gr Gr Gr Sw Sw Sw Sw Sw Sw Sw Sw Bl Bl Bl Bl Bl Bl
D  Gr Gr Gr Gr Sw Sw Sw Sw Sw Sw Sw Sw Bl Bl Bl Bl Bl
E  Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw Sw Sw Sw Bl Bl Bl Bl
G  Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw Sw Sw Sw Bl Bl Bl
H  Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw Sw Sw Sw Bl Bl
I  Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw Sw Sw Sw Bl
K  Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw Sw Sw Sw
M  Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw Sw Sw
N  Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw Sw
P  Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw Sw
Q  Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw Sw
R  Ge Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw Sw
S  Ge Ge Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw Sw
T  Ge Ge Ge Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr Sw
U  Or Ge Ge Ge Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr Gr
X  Or Or Ge Ge Ge Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr Gr
Y  Or Or Or Ge Ge Ge Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr Gr
Z  Or Or Or Or Ge Ge Ge Ge Ge Ge Ge Ge Gr Gr Gr Gr Gr
Crankshaft bearing colors:
BL= Blue.
SW=Black.
Gr= Green.
Ge Yellow.
Or Orange.

Example: Crankcase upper half: 

Combining the dots of the designations of the crankshaft and crankcase produces the following color combinations.

Bearing 1: The letters (P and T) produce in the crankcase upper half the color Ge= Yellow with lubricant groove.

Bearing 2: K and Q= Ge= Yellow.

Bearing 3: I and Q= Ge= Yellow.

Bearing 4: N and R= Gr= Green.

Bearing 5: N and R= Gr= Green.

Fig 9: Identifying Code (5 Of 6)
G05515529Courtesy of BMW OF NORTH AMERICA, INC.

Example: Crankcase lower half: 

Combining the dots of the designations of the crankcase and crankshaft produces the following color combinations.

Bearing 1: The letters P. and T. produce in the crankcase lower half the color Gr= Green without lubricant groove.

Bearing 2: K and Q= Gr= Green.

Bearing 3: I and Q= Gr= Green.

Bearing 4: N and R= Gr= Green.

Bearing 5: N and R= Gr= Green.

Fig 10: Identifying Code (6 Of 6)
G05515531Courtesy of BMW OF NORTH AMERICA, INC.

Install crankcase lower section.  

Assemble engine.

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