The Connecting rod and piston set is the heart of the combustion process in the HOWO 7 6X4 Dump Truck engine, converting the energy of fuel combustion into mechanical work. This precision-engineered assembly consists of the connecting rod, bearing bushes, piston, piston rings, piston pin, and snap rings, all working in perfect synchrony to deliver reliable power and efficiency. For a complete listing of all engine components and their specifications, refer to the Sinotruk Catalog which provides detailed cross-references and original equipment numbers.
This Connecting rod and piston kit includes the Connecting rod assembly, Upper connecting rod bearing bush, Lower connecting rod bearing bush, Piston, Piston ring component, Piston pin, and Piston pin snap ring. Each component is manufactured to exacting tolerances, ensuring that the piston moves smoothly within the cylinder, the rings seal combustion pressure, and the connecting rod transfers force to the crankshaft with minimal friction and wear.
The Connecting rod and piston assembly is designed to withstand extreme temperatures and pressures during combustion. The connecting rods are forged from high-strength steel, while the pistons are cast from a lightweight aluminum alloy with a low-expansion coefficient. The bearing bushes provide a low-friction interface between the connecting rod and the crankshaft and piston pin, and the piston rings ensure proper compression and oil control.
Regular inspection and replacement of the Connecting rod and piston components is essential for maintaining engine performance. Worn bearings or rings can lead to loss of compression, increased oil consumption, and even catastrophic engine failure. Using genuine or high-quality replacement parts ensures that the engine operates at its original specification, delivering the power and fuel economy that the HOWO 7 6X4 Dump Truck is known for.
The Connecting rod assembly is a forged steel component that connects the piston to the crankshaft, transmitting the force of combustion to the rotating assembly. It features a precision-machined big end and small end, with oil passages that lubricate the bearing surfaces. The connecting rod is designed to withstand high compressive and tensile loads, and it is balanced to reduce vibration and ensure smooth engine operation.
The Upper connecting rod bearing bush is a half-shell bearing that fits into the big end of the connecting rod. It is made of steel-backed with a thin layer of bearing alloy, such as copper-lead or aluminum-tin, that provides a low-friction surface for the crankshaft journal. This bearing bush is designed to support the radial loads from combustion and inertia, and it includes a locating tang to prevent rotation within the rod.
The Lower connecting rod bearing bush is the matching half-shell bearing that sits in the connecting rod cap. Together with the upper bush, it forms a complete bearing surface for the crankshaft journal. It is identical in construction to the upper bush, with a precision-bored inner diameter that provides the correct oil clearance. Both bushes are replaced as a matched set to ensure consistent bearing clearance and load distribution.
The Piston is a lightweight aluminum alloy casting that reciprocates within the cylinder, compressing the air-fuel mixture and transmitting combustion force to the connecting rod. It features a complex ring belt with grooves for compression and oil control rings, and a piston pin bore that is precision-honed for a tight fit with the piston pin. The piston skirt is designed to reduce friction and noise while maintaining proper cylinder wall contact.
The Piston ring component is a set of rings that fit into the grooves on the piston. It typically includes two compression rings and one oil control ring. The compression rings seal the combustion chamber, preventing gas leakage past the piston, while the oil control ring scrapes excess oil from the cylinder wall, returning it to the sump. These rings are made from cast iron or steel with specialized coatings for reduced wear and improved sealing.
The Piston pin is a hardened steel cylindrical pin that connects the piston to the connecting rod small end, allowing the piston to pivot as the connecting rod changes angle during rotation. It is a press-fit or floating type, depending on the design, and features a smooth surface finish to reduce friction. The piston pin is retained by snap rings on each end, preventing axial movement.
The Piston pin snap ring is a spring-steel retaining ring that fits into a groove inside the piston pin bore. It prevents the piston pin from moving sideways and contacting the cylinder wall. These snap rings are designed for easy installation and removal, and they provide a secure, rattle-free retention of the piston pin under all operating conditions.
| No. | Part No. | Description |
|---|---|---|
| 1 | 161500030009 | Connecting rod assembly |
| 2 | VG1560037034 | Upper connecting rod bearing bush |
| 3 | VG1560037033 | Lower connecting rod bearing bush |
| 4 | VG1560037011A | Piston |
| 5 | VG1560030050 | Piston ring component |
| 6 | VG1560030013 | Piston pin |
| 7 | VG1560030012 | Piston pin snap ring |
Premium material selection and forging quality. Our connecting rods are forged from high-strength steel, and pistons are cast from a specialized aluminum alloy with a low coefficient of thermal expansion. This ensures dimensional stability and fatigue resistance, even under the high cylinder pressures and temperatures encountered in heavy-duty dump truck operation.
Precision machining and balancing. Each connecting rod and piston assembly is balanced to within strict tolerances, reducing engine vibration and extending bearing life. The bearing bushes are precision-bored to provide the correct oil clearance, and the piston ring grooves are machined to exact depths and angles for optimal ring sealing.
Advanced coating technology for reduced friction. The piston skirts are coated with a dry film lubricant, and the piston rings feature a chrome or nitriding layer that minimizes wear on the cylinder walls. This reduces oil consumption and extends the interval between overhauls, lowering overall operating costs.
Trusted by fleets and rebuilders worldwide. Our Connecting rod and piston kits are used by major engine rebuilders and truck fleets to restore engine performance to original factory specifications. The consistent quality and exact fit of our components ensure that rebuilt engines deliver the same power, fuel economy, and reliability as new units.
Our online catalog provides comprehensive access to genuine SINOTRUK parts for all major vehicle lines — including HOWO, Sitrak, Steyr, and Yellow River series trucks. You can browse detailed specifications, original part numbers, and exploded-view diagrams for every assembly. Whether you are performing routine maintenance or planning a major overhaul, the catalog helps you quickly identify the correct components for your vehicle. When you become a SINOTRUK customer, we offer complimentary full‑access catalog services, ensuring you always have the latest product data and interchangeability information at your fingertips to support efficient fleet management and accurate parts ordering.
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