11 21 531 Replacing all crankshaft main bearing shells (B48AO0)

Special tools required: 

• 00 2 010

Installation note: 

Main bearing shells and guide shells are still  classified by color  or number  .

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

The classification via colors  is omitted.

Necessary preliminary work: 

• Remove CRANKSHAFT 

Enter the code letter on the crankcase  in the table.

K = Clutch side

The item numbers (5) to (1) describe the bearing seats 5 to 1. The code is located on the crankshaft bearing caps  .

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Enter the identification numbers on the crankshaft  in the table.

The position numbers (1) to (5) describe the bearing seats 1 to 5. The code is located on the crankshaft bearing caps 

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Enter the code letters of the crankcase and the identification 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

Determine the colors  or numbers  of the main bearing shells  (1) with the lubricating groove  in the crankcase  using the following table:

	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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Determine colors  or numbers  of the guide bearing shells  (1) with lubricating groove  in the crankcase  using the following table:

	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)

Determine colors  or numbers  of the main bearing shells  (1) without the lubricating groove  in the crankshaft bearing cap  using the following table:

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	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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Determine the colors  or numbers  of the main bearing shells  (1) without the lubricating groove  in the crank bearing cap  using the following table:

	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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Place main bearing shell (1) without  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 .

Check guide bearing shells, crankshaft and crankcase if necessary.

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

Check CRANKSHAFT  coefficient of friction.

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Required follow-up work: 

Assemble engine.