11 21 531 Replacing all crankshaft main bearing shells (B48B)
Special tools required:
- 00 2 010
There must be no oil in the blind holes (risk of cracking) .
Do not wash off bolt 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 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 .
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
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) |
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:
| 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) |
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) |
Place main bearing shell (1) with lubricating groove in crankcase (see arrows).
Observe combination of colors or numbers according to the table.
Observe combination of colors or numbers according to the table.
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.
Install CRANKSHAFT .
Check SIDE CLEARANCE (AXIAL PLAY) .
If necessary, check guide bearing shells, crankshaft and engine block.
Rotate crankshaft (1) with special tool 00 2 010 in direction of arrow.
Check COEFFICIENT OF FRICTION OF CRANKSHAFT .
Required follow-up work:
Assemble engine.