|
Determine crankshaft bearing clearance (determine
bearing clearance with Plastigage)
Note: Crankshaft
bearing cap removed
Measure
Important: To prevent the thread
from breaking when the bearing cap is removed, de-grease the
crankshaft journal and lightly oil the bearing shell.
Do not rotate crankshaft
|
| 1. |
Cut "Plastigage" (deformable plastic thread) to length of
bearing width and place axially between crankshaft bearing journal
and bearing shell (arrow)
|
| 2. |
Fit bearing cover
Note: The bolt can be
reused for checking the crankshaft bearing clearance
| • |
Tighten 2x bolts 88.2 Nm
|
|
|
|
| 4. |
Compare width of flattened plastic thread (arrow) with the
measuring scale
Note: "Plastigage" is
available for various tolerance ranges
| • |
Perm. crankshaft bearing clearance: 0.030 to 0.058 mm
Note: Do not confuse
millimetre and inch information on measuring scale when reading off
value
|
|
|
|
| 5. |
Note the following when selecting the main bearing shells:
|
| 6. |
The main bearing shells are divided into three classes
| • |
The class is based on the bore diameter for the bearing shells
in the cylinder block and is indicated by one number per main
bearing journal in the cylinder block, see F4489 above
|
|
| 7. |
The internal diameter of the main bearing shells is based on
the external diameter of the main bearing journal
| • |
Depending on the diameter, the crankshaft cheeks are marked
with "-" or "- -"
|
| • |
The numbers (1 to 5) refer to the respective main bearing
journal
|
| • |
The (1) refers to the main bearing journal shown at the lower
left in figure F4489, the other to the respective right hand main
bearing journal
|
|
| 8. |
Using these identification codes, the bearing shells with the
corresponding bearing clearance can be selected 
|
|
|
|
