|
Check con-rod bearing clearance (use micrometer
and internal measuring device)
Note: Con-rod and
crankshaft have been removed.
Measure
Important: Measure this without
the bearing shells.
|
| 1. |
Mount the con-rod bearing cap on the con-rod without the
bearing shell
Note: It is not
necessary to replace the bolts for the measuring procedure.
| • |
Tighten 2x bolts 20 Nm + 40°
|
|
| 2. |
The mean con-rod base bearing diameter is determined by
measuring at points I, II and III and computing the result.
|
| 3. |
Formula for calculating the mean con-rod bearing diameter:
|
Example:
|
|
|
|
|
I
|
45.734 mm
|
|
|
|
II
|
45.738 mm
|
|
|
|
III
|
45.744 mm
|
|
|
|
|
137.216 mm
|
: 3 =
|
45.739 mm
|
|
| 4. |
The mean con-rod base diameter is 45.739 mm.
|
|
|
| 5. |
The con-rod bearing journal diameter is determined by measuring
at points I and II with a micrometer and computing the mean.
|
| 6. |
Formula for calculating the mean con-rod bearing journal
diameter
|
Example:
|
|
|
|
|
I
|
42.594 mm
|
|
|
|
II
|
42.596 mm
|
|
|
|
|
85.190 mm
|
: 2 =
|
42.595 mm
|
|
| 7. |
The mean con-rod bearing journal diameter is 42.595 mm.
|
|
|
| 8. |
The con-rod bearing clearance is calculated using the
difference between the con-rod base hole and con-rod bearing
journal diameters and the thickness of the con-rod bearing
shells
|
Example:
|
|
|
Mean diameter of con-rod base
|
45.739 mm
|
|
Mean diameter of con-rod bearing journal
|
- 42.595 mm
|
|
Clearance without bearing shells
|
3.144 mm
|
| |
|
|
Clearance without bearing shells
|
3.144 mm
|
|
Thickness of 2 bearing shells (red)
|
- 2x 1.549 mm
|
|
Con-rod bearing clearance
|
0.046 mm
|
|
| 9. |
Permissible bearing clearance: 0.030
– 0.062 mm
|
|
