Con-rod Bearing Play, Check (Determine Bearing
Play with Micrometer and Inside Micrometer)
Note: Con-rod and
crankshaft are removed.
Install
Con-rod bearing cap with con-rod bearing shell to con-rod
– tightening torque 25 Nm / 18 lbf. ft. + 30°.
The bolts can be reused for checking the con-rod bearing
play.
Measure
Formula for calculating the average con-rod bearing
diameter:
|
I + II + III
|
|
3
|
Example:
|
I
|
|
42.738 mm
|
|
II
|
|
42.732 mm
|
|
III
|
+
|
42.741 mm
|
|
|
|
128.211 mm
|
divided by 3 = 42.737 mm
|
The average con-rod bearing diameter is 42.737 mm.
|
|
The con-rod bearing journal diameter is measured with a
micrometer at points I and II and then calculated.
Formula for calculating the average con-rod bearing journal
diameter:
|
I + II
|
|
2
|
Example:
|
I
|
|
42.729 mm
|
|
II
|
+
|
42.725 mm
|
|
|
|
85.454 mm
|
divided by 2 = 42.727 mm
|
The average con-rod bearing journal diameter is 42.727 mm.
|
|
The con-rod bearing play is calculated
from the difference in diameter between the con-rod bearing bore
and the con-rod bearing journal.
Example:
|
Average con-rod bearing diameter
|
42.737 mm
|
Average con-rod bearing journal diameter
|
- 42.727 mm
|
|
|
|
0.010 mm
|
Permissible con-rod bearing play: 0.019 to 0.071 mm.
|