Standard Procedure - Connecting Rod Bearing Fitting
Bearing oil clearance can also be determined by using Plastigage or equivalent. Refer to MEASURING BEARING CLEARANCE USING PLASTIGAGE .
| 1 - Crankshaft Main Bearing Journal Diameter Grade Markings |
| 2 - Connecting Rod Bearing Journal Diameter Grade Markings |
The connecting rod bearings are "select fit" to achieve a proper oil clearance of 0.040 - 0.078 mm (0.0016 - 0.0031 in.). Connecting rod bearing journal diameter grade markings are stamped into the nose of the crankshaft. These marks are read counterclockwise, corresponding with journal number 1, 2, 3 and 4. Select the bearing size that corresponds to the crankshaft markings for each rod bearing journal.
Connecting rod bearing journal diameter grade markings correspond to specific journal diameters. The chart below identifies the three crankshaft grade markings and their associated journal diameters.
| Crankshaft Marking | Journal Diameter mm (in.) |
|---|---|
| 1 | 49.966 - 49.972 mm (1.9672 - 1.9674 in.) |
| 2 | 49.960 - 49.966 mm (1.9669 - 1.9672 in.) |
| 3 | 49.954 - 49.960 mm (1.9667 - 1.9669 in.) |
| 1 - Rod Bearings |
Install the rod bearings in pairs. Do not mix sizes or use a new bearing half with an old bearing half.
Select the bearing size that corresponds to the crankshaft markings for each rod bearing journal.
| 1 - Color Code |
The connecting rod bearing shells are marked with a color code indicating bearing thickness size. The bearings are available in three different thickness sizes in order to achieve the desired oil clearance.
The chart below identifies the three connecting rod bearing sizes.
| Bearing Marking | Size mm (in.) |
|---|---|
| A (Purple) | 1.497 - 1.500 mm (0.0589 - 0.0591 in.) |
| B (Blue) | 1.500 - 1.503 mm (0.0591 - 0.0592 in.) |
| C (Green) | 1.503 - 1.506 mm (0.0592 - 0.0593 in.) |