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11 21 531 Replacing all crankshaft main bearings (N14)

WARNING: This page is about a different variant/trim than selected.
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
G04751107Courtesy 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.

Fig 2: Identifying Bearings
G04796207Courtesy of BMW OF NORTH AMERICA, INC.

Clean sealing faces with special tool 11 4 470 only.

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 Crankcase Guide Rings
G04789742Courtesy 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.

Fig 4: Identifying Bearing
G04796209Courtesy of BMW OF NORTH AMERICA, INC.

Clean sealing faces with special tool 11 4 470 only.

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 Bearing Color Code Mark
G04796210Courtesy 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 Letters Of Crankcase Bearing
G04796211Courtesy of BMW OF NORTH AMERICA, INC.
COLOR CODE FOR BEARINGS CLASSIFICATION ON UPPER HALF

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 Bearing Color Code Mark
G04796210Courtesy 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 Letters Of Crankcase Bearings
G04796211Courtesy of BMW OF NORTH AMERICA, INC.
COLOR CODE FOR BEARINGS CLASSIFICATION ON LOWER HALF

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 Bearings
G04796207Courtesy 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 Bearings
G04796209Courtesy of BMW OF NORTH AMERICA, INC.

Check spray nozzle (2) for damage, replace if necessary.

Release screw (1).

Tightening torque: 11 11 8AZ .

Remove oil spray nozzle (2).

Installation: 

Oil spray nozzle (2) is turned when screw (1) is tightened and then rests with its upper corner against crankcase.

Fig 11: Identifying Spray Nozzle And Screw
G04789750Courtesy of BMW OF NORTH AMERICA, INC.

Install CRANKCASE LOWER SECTION .

Assemble engine.

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