piston rings

Each piston is provided with five or six piston rings fitted in chromium plated grooves in the crown. The two or three topmost rings are narrow rings having diagonal cuts, while the next two are broad and provided with overlapping end joints. The lowest ring is an oil distributor ring.

The pistons are cooled by oil supplied from the forced lubrication system. The cooling oil is admitted through the pipe, from which the oil is led to the cooling spaces of the piston through telescopic pipes or articulated pipe, and round the internal pipes of the piston rods.