Original Cummins engine parts Idler gear C5664884 in stocked

As a critical component in the engine’s timing system, this idler gear features ultra-precise tooth manufacturing via CNC hobbing and grinding processes. The involute tooth profile has a pitch error of ≤0.02mm and a tooth runout of ≤0.03mm, ensuring smooth meshing with adjacent gears and minimizing transmission backlash to ≤0.05mm. This precision maintains the X15 engine’s valve timing accuracy within ±0.5° CA, synchronizing fuel injection and valve operation to optimize combustion efficiency. The stable meshing also reduces torsional vibration in the timing system by 40%, preventing premature wear of timing chains and extending their service life by 30%

Engineered to endure continuous dynamic loads and high temperatures in the engine compartment, the idler gear uses premium 42CrMo alloy steel as its base material, boasting a tensile strength of ≥1000MPa. It undergoes a rigorous heat treatment process: carburizing (case depth 1.0-1.2mm) to enhance surface hardness to HRC 58-62, followed by tempering to adjust the core hardness to HRC 32-38—balancing wear resistance and impact toughness. This combination enables the gear to withstand 150kN meshing force and 100 million load cycles without tooth chipping or deformation, ensuring a service life of ≥300,000km for X15 engines

Optimized to resist wear and corrosion from engine oil contaminants and high-temperature oxidation, the gear integrates multiple protective features. The tooth surface is polished to a roughness of Ra ≤0.4μm, reducing friction coefficient by 25% and minimizing abrasive wear from metal particles in the oil. A phosphating + electrophoretic coating (20μm thickness) covers the entire gear body, forming a barrier against rust and chemical corrosion from fuel additives and coolant. The gear also undergoes a nitriding treatment on the bore surface, enhancing wear resistance at the shaft interface. It passes 1500-hour neutral salt spray testing (ASTM B117) and 500-hour oil immersion testing (120℃) with no performance degradation

The idler gear is designed for efficient installation and long-term cost savings for fleet managers and repair shops. Its precision-machined bore and keyway ensure quick alignment with the idler shaft, reducing installation time by 40% compared to non-OE gears—two technicians can complete replacement in 90 minutes. The gear’s stable performance prevents timing system failures, avoiding costly valve-piston collisions (repair costs up to $10,000) and unplanned downtime. As a genuine Cummins part, it eliminates the need for aftermarket adjustments, ensuring compatibility with the original timing system. Backed by a 2-year/200,000km warranty, it reduces repeated replacement costs of low-quality alternatives and maintains the engine’s reliability for heavy-duty operations