How to Select Connecting Rod Bearing

HOW TO SELECT CONNECTING ROD BEARING






When New Connecting Rod and Crankshaft are Used
Check pin diameter grade number (0, 1, or 2) stamped in front of crankshaft, and select connecting rod bearing of same grade number.

NOTE: There is no grading for connecting rod big end inner diameter.


When Crankshaft and Connecting Rod are Reused
1. Measure dimensions of the big end inner diameter of connecting rod and outer diameter of crankshaft pin individually.
2. Confirm the big end inner diameter of connecting rod is within the standard value.
3. Apply the measured dimension to the "Connecting Rod Bearing Selection Table".
4. Determine the grade of crankshaft pin diameter grade by comparing the measurement with the values under the crankshaft pin outer diameter of the "Connecting Rod Bearing Selection Table".
5. Select the connecting rod bearing of the same grade.

Connecting Rod Bearing Selection Table:

Undersize Bearings Usage Guide
When the specified oil clearance is not obtained with standard size connecting rod bearings, use undersize (US) bearings.

When using undersize bearing, measure the bearing inner diameter with bearing installed, and grind the crankshaft pin so that the oil clearance satisfies the standard.

Bearing undersize table:

CAUTION: In grinding the crankshaft pin to use undersize bearings, keep the fillet R (All crankshaft pins).