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Connecting Rod: Service and Repair





Install piston to rod as shown. Pistons are available in standard and oversizes of 0.010 and 0.020 inches.





Each 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, 4 or I, II, III, or IIII) indicating the range.

You may find any combination of 1, 2, 3, or 4/I, II, III, or IIII in any engine.

Normal Bore Size: 51.0 mm (2.01 in)

Note: Reference numbers or bars are for big end bore size and do not indicate the position of the rod in the engine. Inspect connecting rod for cracks and heat damage.