Replacing all crankshaft main bearing shells (B48 and B46 engine) (Cooper S and John Cooper Works)

Special tools required: 

• 00 2 010

Attention! 

Replace main bearing bolts.

There must be no oil in the blind holes (risk of cracking). 

Do not  wash off screw coating.

Incorrect assembly of the bearing caps will result in damage to the crankcase. 

Installation note: 

Main bearing shells and guide shells are still  classified by colors  or numbers  .

The classification of the main bearing shells and guide shells is being changed  to a classification exclusively  by numbers  .

The classification by colors  is dropped.

Preliminary work needed: 

• Remove CRANKSHAFT .

Enter the code letter on the crankcase  in the table.

K = Clutch side

Item numbers (5) to (1) describe the bearing seats 5 to 1. The code number is located on each of the crankshaft bearing caps. 

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Enter the key performance indicators on the crankshaft  in the table.

Item numbers (1) to (5) describe the bearing seats 1 to 5. The code number is located on each of the crankshaft bearing caps 

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Enter the code letters of the crankcase and the code numbers of the crankshaft.

Bearing seat 1	Code letter  on the crankcase	Key performance indicator  on the crankshaft
Bearing seat 2
Bearing seat 3
Bearing seat 4
Bearing seat 5

Use the table below to determine the colors  or numbers  of the main bearing shells  (1) with lubricating groove  in the crankcase  :

	A	B	C
1	Classification 1 (blue)	Classification 2 (green)	Classification 2 (green)
2	Classification 1 (blue)	Classification 2 (green)	Classification 3 (brown)
3	Classification 2 (green)	Classification 2 (green)	Classification 3 (brown)

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Use the table below to determine the colors  or numbers  of the guide bearing shells  (1) with lubricating groove  in the crankcase  :

	A	B	C
1	Classification 1 (blue)	Classification 2 (green)	Classification 2 (green)
2	Classification 1 (blue)	Classification 2 (green)	Classification 3 (brown)
3	Classification 2 (green)	Classification 2 (green)	Classification 3 (brown)

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Use the table below to determine the colors  or numbers  of the main bearing shells  (1) without  lubricating groove  in the crankshaft bearing cap  :

	A	B	C
1	Classification 1 (blue)	Classification 1 (blue)	Classification 2 (green)
2	Classification 2 (green)	Classification 2 (green)	Classification 2 (green)
3	Classification 2 (green)	Classification 3 (brown)	Classification 3 (brown)

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Use the table below to determine the colors  or numbers  of the guide bearing shells  (1) without  lubricating groove  in the crankshaft bearing cap  :

	A	B	C
1	Classification 1 (blue)	Classification 1 (blue)	Classification 2 (green)
2	Classification 2 (green)	Classification 2 (green)	Classification 2 (green)
3	Classification 2 (green)	Classification 3 (brown)	Classification 3 (brown)

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Place main bearing shell (1) with  lubricating groove in crankcase (see arrows).

Observe combination of colors or numbers according to the table.

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Observe combination of colors or numbers according to the table.

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Insert main bearing shell (1) with no  lubricating groove in the crankshaft bearing cap (see arrows).

Observe combination of colors or numbers according to the table.

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Install CRANKSHAFT .

Check SIDE CLEARANCE . .

If necessary, check guide bearing shells, crankshaft and crankcase.

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Rotate crankshaft (1) with special tool 00 2 010 in arrow direction.

Check crankshaft COEFFICIENT OF FRICTION .

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Required follow-up work: 

Assemble engine.