Connecting Rod Bearing Fitting
Bearing oil clearance can also be determined by using Plastigage® or equivalent. Refer to STANDARD PROCEDURE .
The connecting rod bearings are "select fit" to achieve proper oil clearance. Connecting rod bearing journal diameter grade markings (2) are stamped into the front crankshaft counterweight. These marks are read from left to right, corresponding with journal number 1, 2, 3, 4, 5, 6. 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.
Stop/Start engine applications may have an IROX® bearing coating. The red in color, IROX® bearing coating is used in Stop/Start engine applications in order to reduce friction and wear. If bearing replacement is necessary, compatible bearings must be used.
| Crankshaft Marking | Journal Size mm (in.) |
|---|---|
| 1 | 53.9910 - 53.9969 mm (2.1256 - 2.1258 in.) |
| 2 | 53.9970 - 54.0029 mm (2.1259 - 2.1261 in.) |
| 3 | 54.0030 - 54.0090 mm (2.1261 - 2.1263 in.) |
Install the rod bearings in pairs. Do not mix sizes or use a new bearing half with an old bearing half.
The connecting rod bearing shells (1) are marked with the bearing size (2) on the bearing lining surface. The bearings are available in three different sizes in order to achieve the desired oil clearance.
Rod bearing shells are available in three sizes. The chart below identifies the three bearing sizes.
| Bearing Marking | Size mm (in.) |
|---|---|
| 1 | 1.583 - 1.580 mm (0.0623 - 0.0622 in.) |
| 2 | 1.580 - 1.577 mm (0.0622 - 0.0621 in.) |
| 3 | 1.577 - 1.574 mm (0.0621 - 0.0620 in.) |