The 1000076563 Piston is an essential Sinotruk spare part specifically engineered for the high-torque, 400HP variants of the HOWO truck range. As a core component of the D12 engine’s combustion chamber, this piston is built to withstand peak cylinder pressures and extreme thermal cycling. Unlike aftermarket alternatives, the genuine 1000076563 features a specialized internal cooling gallery and a reinforced ring land area to prevent premature wear and blow-by in heavy-load conditions.
Technical Specifications:
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Part Name: Engine Piston (Standard Size)
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Part Number: 1000076563
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Engine Suitability: Sinotruk D12.42, D12.38, D12.40 (400HP Series)
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Material: High-Silicon Aluminum Alloy with Heat Treatment
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Diameter: 126 mm (Standard)
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Features: Integrated oil cooling gallery, graphite-coated skirt for reduced friction.
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Piston Pin Diameter: 50 mm (Precision ground)
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Weight: 3.2 kg
Practical Installation Advice for Mechanics:
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Check the “Top” Mark: Before fitting the 1000076563 piston, locate the directional arrow or “Top” stamp on the crown. It must point toward the front (fan end) of the engine to ensure correct valve clearance and combustion bowl alignment.
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Ring Orientation: Ensure the piston ring gaps are staggered at 120-degree intervals. Avoid placing any ring gap in line with the piston pin axis or the thrust side of the skirt.
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Wrist Pin Lubrication: Use a high-quality assembly lube or clean engine oil on the wrist pin and bush before insertion. It should be a smooth, thumb-push fit; never force the pin with a hammer.
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Clean the Cooling Jet: Since this 400HP piston relies on an internal cooling gallery, verify that the engine block’s oil cooling jets are clear and aimed correctly to spray into the piston’s intake port.
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Cylinder Liner Inspection: Always measure your liner bore for “out-of-round” wear. Installing a new genuine Sinotruk spare part like the 1000076563 into a worn liner will cause rapid ring failure.
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