Forged Aluminum Engine Spare Parts Piston Kit 4376335 For 6B5.9 Excavator

Piston 4376335 is a forged aluminum piston engineered for heavy-duty turbo diesel engines. It is commonly used in the overhaul of large excavators, mining dump trucks, and concrete pump power units.

• Streamlined Combustion Bowl Profile The curved inner chamber is calibrated to match the injector spray angle. It creates an organized fuel swirl for efficient combustion, minimizes carbon deposition, and reduces black smoke emission at low engine speeds.
• Grain Refinement Treatment on Ring Groove Zones Special heat treatment refines the metal structure around the ring grooves. It boosts surface hardness and fatigue resistance against repeated friction, preserving groove geometry and cylinder sealing performance over long service hours.
• Micro-Dimple Oil Storage Texture on Skirt Fine recessed pockets on the piston skirt hold a persistent lubricating oil film. This prevents direct metal contact between the skirt and liner and greatly reduces scuffing risk during cold starts.
• Double-Radius Transition for Pin Bore Ends Smooth curved transitions on both sides of the wrist pin hole distribute impact stress evenly. This eliminates stress concentration cracks and improves fatigue life under fluctuating heavy vibration loads.
• Weight Grading and Sorting Inspection Each piston is weighed precisely and grouped within a tight tolerance. The weight difference between pistons for one engine is strictly limited, ensuring good dynamic balance and lowering engine vibration.

This aftermarket piston offers excellent interchangeability. It can be supplied separately or as a complete set with piston pin, circlips, and rings. When assembled with cylinder liner kits, it delivers durable and stable performance under continuous heavy loads at quarry and construction sites.