Piston And Connecting Rod
| ITEM | DESCRIPTION |
|---|---|
| 1 | Piston and connecting rod assembly - Cylinders 4-6. |
| 2 | Piston and connecting rod assembly - Cylinders 1-3. |
| 3 | Connecting rod bearing cap (quantity 6) |
| 4 | Bolts (quantity 12) |
| 5 | Connecting rod bearings (quantity 6) |
The piston crown incorporates a bowl to form the combustion chamber which promotes swirl and turbulence necessary for good combustion and improved emissions. In addition, the piston skirt has a molybdenum-coated surface, which reduces scoring of the cylinder bore and piston.
The piston also incorporates a gallery within the piston crown to enhance piston cooling. The pistons are supplied with oil by means of piston cooling oil jets located in the cylinder block oil gallery.
Each piston is installed on a gudgeon pin located in the small end bearing of the connecting rod and secured by 2 circlips.
| ITEM | DESCRIPTION |
|---|---|
| 1 | Ring gap oil control |
| 2 | Ring gap upper compression |
| 3 | Spiral joint oil control |
| 4 | Upper compression ring |
| 5 | Lower compression ring |
| 6 | Oil control ring |
| 7 | Ring gap lower compression |
Each piston has 3 piston rings. The top piston ring is a taper type and installed with the taper to the top of the piston.
All piston rings are marked 'top' to identify the direction of installation and must be spaced evenly around the piston.