Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Rod Bearing Selection
- Inspect each connecting rod for cracks and heat damage.
Connecting Rod Big End Bore Code Locations
- Each connecting rod falls into one of four tolerance ranges (from 0 to 0.024 mm (0.0009 in), in 0.006 mm (0.0002 in) increments) depending on the size of its big end bore. It's then stamped with a number or bar (1, 2, 3, or 4) indicating the range. You may find any combination of 1, 2, 3, or 4 in any engine.
If the codes are indecipherable because of an accumulation of dirt and dust, do not scrub them with a wire brush or scraper. Clean them only with solvent or detergent.
Normal Bore Size: 43.0 mm (1.69 in)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Connecting Rod Journal Code Location
- The connecting rod journal codes are stamped on the crankshaft.
- Use the big end bore codes and the rod journal codes to select appropriate replacement bearings from the following table.NOTE: Color code is on the edge of the bearing.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.