Large End Bore Size

Each rod falls into one of four tolerance ranges (from 0 to 0.024 mm (0.0009 inch), in 0.006 mm (0.0002 inch) increments) depending on the size of its big end bore. It's then stamped with a number (1, 2, 3, or 4) indicating the range. You may find any combination of 1, 2, 3, or 4 in any engine.

Normal Bore Size: 48.0 mm (1.89 inch)


Note: for more information see Testing and Inspection / Selection and Bolt Inspection.