2. Before installation check up coincidence of number of cylinders on a rod of a rod and a cover. When installing a new connecting rod, make sure that the grooves for holding the bearing shells are located on one side.
3. Check up working surfaces of a rod. If you find any mechanical damage or wear on the upper head, replace the connecting rod.
4. Using a special tool, measure the amount of bending and twisting of the connecting rod. Maximum permissible value: bending - 0.05 mm per 100 mm of length; twisting - 0.1 mm per 100 mm length. If the measurement result is not much different from the limit value, straighten the connecting rod with a press. If there is a significant discrepancy between the values, the connecting rod must be replaced.
Checking the clearance in the connecting rod bearing
5. Check up coincidence of labels on a rod and a cover.
6. Turn off 2 nuts of fastening of a cover of a rod bearing.
7. Remove the connecting rod bearing cap and bottom bearing.
8. Clean the connecting rod bearing and crankshaft journal.
9. Place a piece of plastic gauge on the crankshaft journal.
10. Install the connecting rod bearing cap and tighten the fastening nuts to nominal torque.
Note: Do not turn the crankshaft.
11. Remove the cover and lower bearing shell.
12. Using the control scale, measure the width of the flattened section of the gauge at its widest point. Nominal gap: 0.018-0.038mm. If the clearance exceeds the maximum allowable value, replace the connecting rod bearing with a new one with the same marking and recheck.
Attention: Machining of inserts or cover is not allowed.
13. If the clearance in the new bearings still does not meet the required value, select a larger or smaller insert (in accordance with the marking) and recheck.
Note: if the required clearance is not achieved by selecting the liners, replace the crankshaft.
Connecting rod marking
Label | Inner diameter, mm |
A | 48,000-48,006 |
b | 48,006-48,012 |
With | 48,012-48,018 |
1. Label of the size group of the connecting rod bearing bore
Crankshaft journal marking
Label | Neck diameter, mm |
A | 44,966-44,972 |
b | 44,960-44,966 |
With | 44,954-44,960 |
2. Letter marking of the size group of connecting rod journals
Connecting rod bearing marking
Class | Marking | Insert thickness, mm |
AA | Blue | 1,514-1,517 |
A | Black | 1,511-1,514 |
IN | - | 1,508-1,511 |
WITH | Green | 1,505-1,508 |
D | Yellow | 1,502-1,505 |
3. Letter marking of the liner
4. Color label