Connecting Rod: Description and Operation

Each piston is cast aluminum alloy and has two compression rings and one oil ring. The top compression ring is plated with hard chromium for improvement in abrasion resistance. The oil ring consists of two rails and one spacer.

The piston pin is offset 0.5 mm (0.02 inch) toward the thrust side. This allows a gradual change in thrust pressure against the cylinder wall as the piston travels through the bore. Piston pins are chromium steel and have a floating fit in the pistons and partially in the connecting rods. The connecting rods are made of forged steel and the rod bearings are of precession insert type.