|
Check crankshaft bearing play (with micrometer
gauge internal measuring device)
Note: Cylinder block
base plate and crankshaft removed
Measure
| 1. |
Attach cylinder block base plate to cylinder block
Note: To prevent thread
from breaking when removing cylinder block base plate, remove
grease from con-rod journal and lightly oil crankshaft bearing
bearing shell. Do not rotate crankshaft.
| • |
Tighten 10x bolt M8 (inner) 25 Nm +
60°
Note: The old bolts can
be used for the measuring process
|
| • |
Tighten 12x bolt outer (M6) 10 Nm +
60°
Note: The old bolts can
be used for the measuring process
|
|
| 2. |
The average crankshaft bearing bore diameter is measured using
an internal measuring device at points I, II and III and then
determined by calculation.
|
| 3. |
Formula and example of calculating the average crankshaft
bearing bore diameter:
|
I
|
50.022 mm
|
|
|
+ II
|
50.018 mm
|
|
|
+ III
|
50.014 mm
|
|
|
|
150.054 mm
|
: 3 = 50.018 mm
|
|
| 4. |
The average crankshaft bearing bore diameter is 50.018 mm.
|
|
|
| 5. |
The crankshaft bearing journal diameter is measured with a
micrometer gauge at the points I and II
|
| 6. |
Formula and example of calculating the average crankshaft
journal diameter:
|
I
|
50.004 mm
|
|
|
+ II
|
49.998 mm
|
|
|
|
100.002 mm
|
: 2 = 50.001 mm (average bearing journal diameter)
|
|
| 7. |
The average crankshaft bearing journal diameter is 50.001
mm.
|
| 8. |
Determine the bearing play using the average crankshaft bearing
bore diameter and the average crankshaft bearing journal
diameter
|
|
average crankshaft bearing bore diameter
|
50.018 mm
|
|
-
|
Average crankshaft journal diameter
|
50.001 mm
|
|
|
Bearing play
|
0.017 mm
|
|
| 9. |
The crankshaft bearing play determined is 0.017 mm in this
example
|
| 10. |
Permissible crankshaft bearing play: 0.007 to 0.031 mm
|
|
|
|
