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Yuchai 6J125 Engine Accessories Piston J3200-1004015 Used for Yutong Bus

Part Number: J3200-1004015 is a high-performance diesel engine piston designed specifically for heavy-duty applications in Yuchai’s (Guangxi Yuchai Machinery Co., Ltd.) advanced YC6J series engines. Engineered to withstand extreme combustion pressures and thermal loads, this piston delivers exceptional durability, efficiency, and reliability under continuous high-load operation. Featuring an optimized Ω-shaped combustion chamber, precision ring grooves, and advanced surface treatments, it supports direct injection systems and meets stringent emission standards. Widely used in commercial trucks, buses, agricultural machinery, and power generation units, this component represents Yuchai's commitment to innovation and performance in modern internal combustion technology as of 2026.
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  • J3200-1004015

  • Yutong Bus Parts

Attribute Detail
Part Number J3200-1004015
Product Name Diesel Engine Piston
Brand Compatibility Yuchai (Guangxi Yuchai Machinery)
Engine Series YC6J Series (e.g., YC6J125Z-T20, YC6J125Z-T21)
Material High-Silicon Aluminum Alloy
Surface Treatment - Crown: Anodized Oxidation Coating
– Skirt: Graphite or Molybdenum Coated
Weight (Net) Approximately 1.2 kg – 1.5 kg
Application Type Heavy-Duty Commercial Vehicles, Agricultural Equipment, Power Generators
Design Purpose High-Load, Long-Life Operation with Low Friction and Thermal Stability
活塞-3


活塞-2


Parameter Specification
Combustion Chamber Type Omega-shaped (ω), deep bowl design for direct fuel injection; promotes efficient air-fuel mixing and complete combustion
Ring Groove Configuration Three-Ring System:
– Top Ring: Trapezoidal groove (anti-carbon lock design)
– Second Ring: Taper-faced compression ring groove
– Bottom Ring: Oil Control Ring (three-piece or two-rail type)
Piston Pin Design Full-floating type with press-fit into connecting rod bushing; compatible with heavy-duty piston pins
Pin Diameter Standardized for YC6J platform (~28–30 mm typical; exact size depends on variant)
Thermal Management Crown anodization improves heat resistance; skirt coating reduces friction and scuffing during cold start
Expansion Control High-silicon aluminum alloy minimizes thermal expansion, maintaining optimal cylinder clearance
Recommended Cylinder Liner Finish Plateau honed surface with proper roughness (Ra 0.8–1.2 μm) for ring seating


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