Piston And Connecting Rod
| ITEM | DESCRIPTION |
|---|---|
| 1 | Circlip (2 off) |
| 2 | Bearing - Connecting rod small end |
| 3 | Connecting rod |
| 4 | Piston ring - Upper - Compression |
| 5 | Piston ring - Lower - Compression |
| 6 | Oil control ring |
| 7 | Piston |
| 8 | Piston pin |
| 9 | Bolt (2 off) |
| 10 | Connecting rod - Big end cap |
| 11 | Bearing shell - Lower - Connecting rod big end |
| 12 | Bearing shell - Upper - Connecting rod big end |
The connecting rods are manufactured from forged powder metal and have fracture split big end caps to ensure precision re-assembly for bearing shell alignment.
There are a number of grades of large end bearing available, each being color coded. By measuring the crankshaft pin journal and the large end diameter of the connecting rod, the correct thickness large end bearing shells can be selected to give the optimum clearance.
A choice of three piston diameters are available. The diameter of each piston is measured and precisely matched to each cylinder bore diameter. Each piston has a grade number, 1, 2 or 3, which corresponds to its measured diameter.
The connecting rod and piston are marked to ensure correct assembly with the marks facing the front of the engine. The top face of piston has an arrow which must also point towards the front of the engine.