Rod Bearings
- Inspect journals for wear, taper and out-of-round. If specifications are exceeded, grind journals to undersize or replace crankshaft. See CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS under ENGINE SPECIFICATIONS.
- Inspect bearing shells for signs of fusion, pitting, burning or flaking. Standard bearings are unmarked or colored Green, Black, Yellow or Blue on edge of bearing. Undersized bearing is painted Red on edge of bearing. Undersize bearing thickness is .0632-.0636" (1.605-1.615 mm) at center of bearing.
- Check bearing clearance using Plastigage. Refer to the CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS . Standard connecting rod side play is .010-.015" (.25-.40 mm), with a service limit of .0157" (.40 mm).
- Connecting rod crank pin diameter is determined by letter ("A", "B" or "C") stamped on crank web No. 3. See Fig 1. Connecting rod large end bore diameter is stamped ("1", "2" or "3") on side of connecting rod. See the appropriate connecting rod tables for specific information.
CONNECTING ROD CRANK PIN DIAMETERS
| Letters Stamped On Web | In. (mm) |
|---|---|
| "A" | 1.9683-1.9685 (49.994-50.000) |
| "B" | 1.9680-1.9683 (49.988-49.994) |
| "C" | 1.9678-1.9680 (49.982-49.988) |
CONNECTING ROD MAIN BEARING CAP BORE DIAMETERS
| Number Stamped On Rod | In. (mm) |
|---|---|
| "1" | 2.0866-2.0868 (53.000-53.006) |
| "2" | 2.0868-2.0870 (53.006-53.012) |
| "3" | 2.0870-2.0873 (53.012-53.018) |
COLOR CODE FOR STANDARD CONNECTING ROD BEARINGS
| Color Painted | Thickness - In. (mm) |
|---|---|
| Green | .0583-.0585 (1.482-1.485) |
| Black | .0585-.0586 (1.485-1.488) |
| No Paint | .0586-.0587 (1.488-1.491) |
| Yellow | .0587-.0588 (1.491-1.494) |
| Blue | .0588-.0589 (1.494-1.497) |
STANDARD CONNECTING ROD BEARING APPLICATIONS
| Letter Stamped On Crank Web No. 3 | Numbers Stamped On Connecting Rod | Color |
|---|---|---|
| "A" | "1" | Green |
| "A" | "2" | Black |
| "A" | "3" | No Paint |
| "B" | 1 | Black |
| "B" | "2" | No Paint |
| "B" | "3" | Yellow |
| "C" | 1 | No Paint |
| "C" | "2" | Yellow |
| "C" | "3" | Blue |