Description And Operation
The connecting rods are in forged steel. The big end (cap) is split so that it can be separated.
The connecting rod weight class (1) is stamped on the outside surface of the connecting rod bearing cap.
The connecting rod half-bearings (upper and lower) are classified according to 3 tolerance classes. The reference tolerance class is stamped on the outside surface of the half-bearings themselves.
The pistons are made of cast aluminum alloy with a graphite coating.
Indentations on the piston crown allow for intake valve clearance. There is a hollow area "dish" at the center of the piston crown that helps create the right amount of turbulence to mix the fuel and air.
The pistons have the following features:
- Piston crown hollow area (dish)
- Clearance for intake valves
- Arrow that indicates the timing side
- Part number
- Class indication
Combustion chamber pressure is captured by two compression rings, the first groove compression ring (1) and the second groove compression ring (2). The ring that scrapes the oil from the cylinder walls, the oil control ring (3), is in the third groove.
The piston pin is held in its place by two circlips (4).