|
Check con-rod bearing play (with micrometer gauge
and internal measuring device)
Measure
Important: Do not swap over
con-rod bearing caps and con-rods during assembly and ensure the
mating surfaces are absolutely clean
|
| 1. |
Fit con-rod bearing cap (3) with con-rod bearing shells (2) to
con-rod (1)
Note: The old bolts can
be re-used for checking
| • |
Tighten 2x bolt 13 Nm + 60° +
15°
|
|
|
|
| 2. |
The average con-rod bearing diameter is measured with an
internal measuring device at the points I, Ii and III and
determined mathematically. Formula and example of calculation of
the average con-rod bearing diameter:
|
I
|
43.026 mm
|
|
|
+ II
|
43.027 mm
|
|
|
+ III
|
43.031 mm
|
|
|
|
129.084 mm
|
:3 = 43.028 mm
|
|
| 3. |
The average con-rod bearing diameter is 43.028 mm.
|
| 4. |
The con-rod bearing journal diameter is measured with a
micrometer at the points I and II. Formula and example of
calculation of the average con-rod bearing journal diameter:
|
|
I
|
42.977 mm
|
|
|
+
|
II
|
42.985 mm
|
|
|
|
|
85.962 mm
|
: 2 = 42.981 mm
|
|
|
|
| 5. |
The average con-rod bearing journal diameter is 42.981 mm.
|
| 6. |
Determine the con-rod bearing play using the average con-rod
bearing bore diameter and the average con-rod journal diameter.
|
|
Average con-rod bore diameter
|
43.028 mm
|
|
-
|
Average con-rod bearing journal diameter
|
42.981 mm
|
|
|
Con-rod bearing play
|
0.047 mm
|
|
| 7. |
The con-rod bearing play calculated in this example is 0.047
mm. The permissible con-rod bearing play is 0.013 mm to 0.061
mm.
|
|
