| Detailed Technical Parameters of Heavy Truck Engine Four Supporting Systems |
| parameter category | specific project | technical indicators | Test Standard |
| piston assembly | material | Eutectic aluminum silicon alloyZL109 | GB/T 1173 |
| Top hardness | HB120-150 | GB/T 231.1 |
| Pin hole diameter | φ40±0.005mm | GB/T 1800.2 |
| weight deviation | ±2g | / |
| piston ring | The first ring material | QT700-2 | GB/T 1348 |
| Toroidal coating | Molybdenum based alloy, thickness0.1-0.15mm | JB/T 6016 |
| Radial pressure | First Ring:0.15-0.25MPa | QC/T 284.1 |
| Second Ring:0.10-0.20MPa |
| Oil ring: 0.05-0.15MPa |
| Light leakage | ≤25° | GB/T 1149.5 |
| cylinder liner | material | Boron alloy cast iron | GB/T 9439 |
| inner diameter size | φ107.000-107.035mm | GB/T 1800.2 |
| hardness | HB220-280 | GB/T 231.1 |
| Mesh angle | 25°±5° | QC/T 284.2 |
| Roundness error | ≤0.015mm | GB/T 1184 |
| piston pin | material | 20Cr | GB/T 3077 |
| surface hardness | HRC58-64 | GB/T 230.1 |
| outer diameter dimension | φ39.995-40.000mm | GB/T 1800.2 |
| performance metrics | assembly clearance | 0.03-0.05mm | QC/T 284.3 |
| Oil consumption | <0.15g/kWh | GB/T 19055 |
| durability | 2000 hour bench test | GB/T 18297 |
| service life | ≥ 500000 kilometers | Actual road test |
