Product introduction
The Cummins 4376246 pistons, as one of the most critical components of Cummins engines, are renowned worldwide for their exceptional durability, with the 5.9-liter and 6.7-liter models being particularly favored. Whether it's the early 5.9-liter Cummins pistons or the more powerful 6.7-liter Cummins pistons, their piston design directly impacts engine efficiency and reliability. Particularly noteworthy are the 24-valve models, commonly referred to as 24V Cummins pistons or 24-valve Cummins pistons, which significantly improve fuel efficiency and power output through optimized combustion chamber design and material processing. These high-performance piston components are core parts ensuring the stable operation of Cummins engines under harsh conditions and are also key to engine overhauls and performance upgrades.
Product Images
Product Parameters
| Parameter category | Detailed Description |
| Part number | 4376246 |
| Compatible engine | 24-valve 5.9L and 6.7L diesel engines |
| Materials and processes | Alloy cast iron or steel base, surface molybdenum diffusion/chromium plating treatment, wear resistance increased by 2.3 times |
| Sealing design | The structure of the deflector groove optimizes the distribution of engine oil, and the opening clearance is precisely controlled (side clearance 0.25-0.5mm, end clearance 0.04-0.1mm). |
| Performance parameter | The major overhaul cycle is 1.6 million kilometers. It is compatible with high-pressure common rail systems (with a pressure resistance of 1800bar) and meets the National VI B/ Euro VI D emission standards |
| Wear resistance | The combined treatment of plasma molybdenum diffusion and tungsten disulfide (WS2) reduces the coefficient of friction by 30% and shortens the running-in period by 60%. |
| Precision manufacturing | The laser honing process controls the cross mesh pattern, improving the sealing performance by 30% and making it suitable for harsh working conditions. |
Product Advantages
Combining graphite coating technology on the skirt improves friction reduction by 40%, and the nitriding treatment of the ring grooves achieves a hardness of HV800+, significantly extending the overall service life. The thickness is increased by 15%, allowing it to withstand 1800 bar of burst pressure. The internal cooling oil passage design reduces the top temperature by 80-120℃, avoiding the risk of top melting. The piston crown cavity is matched with the injector angle, optimizing fuel atomization efficiency and improving power output stability.
FAQ
Q: 1. What are the core materials and technological advantages of the Cummins 4376246 piston?
A: The graphite coating on the skirt reduces friction by 40%, and the ring grooves are nitrided to a hardness of HV800+. The chrome-plated compression rings (hardness HV900) reduce wear by 50%, the oil ring spring tension is 18-22N, and oil consumption is <0.1g/kWh.
Q: 2. Which engine models is this piston compatible with?
A: Designed specifically for 24-valve 5.9L/6.7L engines, suitable for cylinder bores Φ90mm-Φ160mm, meeting China VI B/Euro VI D emission standards.
Q: 3. How to prevent cylinder scoring?
A: Warm up at idle for 3 minutes after a cold start to ensure oil pressure builds up; check the ring assembly wear every 5000 hours.
Q: 4. What are the international shipping packaging requirements for the 4376246 piston?
A: Leak-proof sealed packaging, outer box labeled "Genuine Parts" with Chinese and English labels, precision parts filled with nitrogen for moisture protection, and accompanied by MSDS document.
Q: 5. What certifications are required for export to Europe and the United States?
A: CE certification (EU) or EPA compliance certificate (US), the document must match the actual product name and quantity.
Q: 6. What are the customs clearance document requirements?
A: Commercial invoice, packing list, certificate of origin, Cummins anti-counterfeiting label (scratch-off coating for verification).
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