Piston: Description and Operation

Pistons
The pistons are made of light alloy and have grooves for two compression rings and one scraper ring.

The top compression ring is flat and coated with molybdenum, the lower compression ring, which is slightly wider than the top one, also has a scraper function. The scraper ring itself is in three parts.

The wrist pins are shrunk into the connecting rods-and are consequently not of fully-floating type.