Haval engine piston - 1004011XEC71

⚙️ Part Name: Engine Piston Assembly

🔢 Original Part Number (OEM): 1004011XEC71

• 🔄 Common interchange/alternative numbers: GW4C20 piston family (e.g., 1004011AEC01 / 1004011XEC01 depending on engine class and modification and standard STD clearance size).

• 📍 Location: Inside the cylinders of the engine block (machine cylinder), connected to the connecting rod (arm/con-Rod).

🔧 Mechanical function and role:

• It receives the explosive force resulting from the combustion of the air and fuel mixture inside the combustion chamber and converts it into a straight linear motion that is transmitted through the arm to the crank as a rotational motion.
• It maintains tight pressure in the combustion chamber and prevents leakage of gases or oil in cooperation with piston rings.
• Designed from heat-treated aluminum alloys to withstand the extreme temperatures and pressures generated by the turbocharger.

🚘 Compatibility and motors:

• ⚙️ Engine type: Great Wall/Haval 2.0L GW4C20 / GW4C20B turbo petrol engines
• 🚙 Compatible models (GWM / Haval / Tank):
  • Haval H9
  • Haval H6
  • Haval H8
  • Tank 300 (2.0T petrol engine)
  • Great Wall Poer / P-Series (Gasoline)

⚠️ Key signs of damage or the need for replacement:

• 💨 Blue/grey smoke coming out of the exhaust (oil vaporization or burning due to corrosion of the piston walls or piston rings).
• 📉 A noticeable and persistent shortage of engine oil and a severe decrease in cylinder compression (Low Compression).
• 🔊 Piston slap is a light metallic clicking sound that increases when the engine is cold or under load.
• 💥 Breakage or melting of the piston edges as a result of violent knocking or high engine temperature.

💡 Technical Tip: When overhauling the engine and changing the pistons, the diameter and integrity of the cylinder wall must be accurately measured, the clearance weight must be checked, and the piston rings and connecting rod bearing set must be replaced with each new piston.