Main Bearing Bore Standard Dimensions
| Engine 137. | |
| Basic bore diameter | 68.500-68.519 mm |
| Code Number 52, 1st Stage, (Blue) | 68.500-68.506 mm |
| Code number 54, 2nd Stage, (Yellow) | 68.506-68.513 mm |
| Code Number 56 3rd Stage, (Red) | 68.513-68.519 |
| basic bore width at fit bearing | 17.073-18.00 mm |
| permissible out of roundness and conicity of basic bore | 0.02 mm |