11 21 531 Replacing all crankshaft main bearings (N14)

Special tools required:

11 4 470

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:

Remove CRANKSHAFT .

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 Shell With And Without Lubricating Groove

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IMPORTANT: Modified assignment of bearings.
Bearing (1) is at the output end (clutch end)

Bearings (1 to 5).

Bearing (2) is a guide bearing.

Fig 2: Identifying Bearings

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

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 Guide Rings

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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 Bearings

Courtesy 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 Classification (1 Of 4)

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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 Bearing Classification (2 Of 4)

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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 Classification (3 Of 4)

Courtesy 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 Bearing Classification (4 Of 4)

Courtesy of BMW OF NORTH AMERICA, INC.

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

Courtesy 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

Courtesy 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 Oil Spray Nozzle And Screw

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Install CRANKCASE LOWER SECTION .

Assemble engine.