Connecting Rod Bearings
NOTE:
There are three sizes of standard connecting rod bearings, each size is marked with an A, B or C. Replacement connecting rod bearings should have the same letter as the letter stamped on the connecting rod cap. See Fig 1 and STANDARD CONNECTING ROD BEARING SIZES tables.
Measure connecting rod bearing clearance using Plastigage method. Replace bearings or grind crankshaft if clearance is greater than .0031" (.078 mm). Regrind crankshaft to .010" (.25 mm) undersize if taper or out-of-round is greater than .0004" (.010 mm). Connecting rod journal diameter for undersize is 2.0748-2.0752" (52.699-52.710 mm).
STANDARD CONNECTING ROD BEARING SIZES
| Application | In. (mm) | |
|---|---|---|
| Connecting Rod Cap Letter A | ||
| Big End Inside Diam. | 2.2047-2.2050 (56.000-56.006) | |
| Crank Pin Diameter | 2.0861-2.0866 (52.988-53.000) | |
| Bearing Thickness | .0584-.0586 (1.484-1.488) | |
| Connecting Rod Cap Letter B | ||
| Big End Inside Diam. | 2.2050-2.2052 (56.006-56.012) | |
| Crank Pin Diameter | 2.0861-2.0866 (52.988-53.000) | |
| Bearing Thickness | .0586-.0587 (1.488-1.492) | |
| Connecting Rod Cap Letter C | ||
| Big End Inside Diam. | 2.2052-2.2054 (56.012-56.018) | |
| Crank Pin Diameter | 2.0861-2.0866 (52.988-53.000) | |
| Bearing Thickness | .0587-.0589 (1.492-1.496) | |
| Connecting Rod Cap Letter .25 O/S | ||
| Big End Inside Diam. | 2.2047-2.2054 (56.000-56.018) | |
| Crank Pin Diameter | 2.0748-2.0752 (52.701-52.711) | |
| Bearing Thickness | .0640-.0644 (1.626-1.636) | |