Original Cummins engine parts piston C5665712 in stocked

Built as the core component of the engine’s combustion chamber, this piston is crafted from high-strength 4032 forged aluminum alloy, boasting a tensile strength of 450MPa and yield strength of 380MPa. It undergoes a T6 heat treatment process (solution annealing + artificial aging) to enhance hardness (HB 120-140) and fatigue resistance, enabling it to withstand 20MPa maximum combustion pressure (common in X15 full-load operation). The forging process eliminates internal pores and defects, ensuring uniform material density—reducing the risk of piston cracking by 70% compared to cast pistons. This robust material ensures the piston’s service life reaches ≥300,000km under heavy-duty working conditions

Engineered to optimize combustion efficiency, the piston features a deep bowl-shaped combustion chamber with a 18:1 compression ratio (matched to X15 engine requirements). The chamber’s smooth, streamlined contour promotes turbulent fuel-air mixing, increasing combustion completeness by 10% and reducing unburned fuel emissions. A 2mm chamfered edge on the chamber mouth prevents carbon deposit accumulation, maintaining consistent compression over time. The piston’s top land is shortened to 8mm, reducing crevice volume and improving thermal efficiency—translating to a 5% boost in engine power (from 500hp to 525hp) and a 3-4% reduction in fuel consumption for long-haul trucks

Optimized to endure high temperatures and friction, the piston integrates advanced cooling and wear-resistant features. A closed-loop oil cooling gallery runs through the piston crown, circulating engine oil to reduce crown temperature by 40℃ (from 350℃ to 310℃) during full load. The piston skirt is coated with a 0.05mm-thick molybdenum disulfide (MoS₂) layer, reducing friction coefficient by 30% and minimizing wear against the cylinder liner. The piston ring grooves are reinforced with cast iron inserts (HRC 55-60), preventing groove wear from the compression rings. These features ensure stable performance even in dusty mining or high-temperature desert environments

The piston undergoes ultra-precision machining to ensure reliable performance and cost savings. The skirt features a barrel-shaped design with a taper of 0.05mm, ensuring uniform clearance (0.03-0.05mm) with the cylinder liner—reducing cold-start noise and oil consumption. The piston pin bore is honed to a surface roughness of Ra ≤0.1μm, ensuring smooth rotation with the connecting rod and preventing pin seizure. As a genuine Cummins part, it eliminates the need for aftermarket adjustments, reducing installation time by 40%. By preventing piston-related failures (e.g., seizure, cracking), it avoids expensive engine overhauls (costing up to $15,000) and unplanned downtime. Backed by a 2-year/250,000km warranty, it provides long-term value for fleet operators