a multi - piece connecting rod is provided in which the piston pin bearing boss is divided along a transverse plane perpendicular to its bearing axis and is formed by extensions of two rod components provided with bearing holes while the crankpin bearing boss is divided along an axial plane through its bearing axis . for installation , the rod components are pivotable about the piston pin axis to open or unfold the crankpin end to receive the crankpin prior to closing and securing the rod components in their closed positions .