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This authentic Sinotruk HOWO exhaust valve (Part No: 082V04101-0539) is precision-engineered to exact OEM specifications, ensuring optimal engine performance and durability under extreme operating conditions. Designed for heavy-duty applications in HOWO trucks, this valve manages high-temperature exhaust gas expulsion, featuring heat-resistant alloy construction and precision machining to maintain seal integrity and prevent leakage. The specialized stem coating reduces wear and ensures smooth operation within the valve guide, while the hardened face resists erosion from continuous exposure to combustion gases. Ideal for engine overhauls and maintenance, this component is essential for maintaining exhaust system efficiency and compliance with emission standards.
Technical Specifications:
Material: Heat-resistant nickel-chromium alloy steel (21-4N) with stellited tip
Stem Diameter: 8.5 ± 0.01 mm
Head Diameter: 42.0 ± 0.05 mm
Overall Length: 118.5 ± 0.1 mm
Stem Hardness: 30-35 HRC
Face Angle: 45° precision ground
Temperature Resistance: -40°C to +900°C (intermittent)
Compatibility: HOWO A7, T7H series with WEICHAI WP10/WP12 engines
Surface Treatment: Nitrided stem with chromium-plated tip for enhanced wear and corrosion resistance
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Installation Notes
Pre-Installation Checklist:
1.Inspect Components: Verify part number (082V04101-0539) and check for straightness (roll on flat surface) and stem finish.
2.Cleanliness: Ensure valve guide and seat are free of carbon deposits and debris.
3.Measurement: Check valve stem-to-guide clearance (0.02-0.05 mm) and valve face runout (max 0.03 mm).
Installation Steps:
1.Lubrication: Apply clean engine oil to valve stem before insertion.
2.Insertion: Gently insert valve into guide, avoiding force to prevent stem damage.
3.Spring Installation: Install valve spring, retainer, and locks using proper compressor tool.
4.Lash Adjustment: Set valve clearance to 0.25-0.30 mm (cold engine) using feeler gauges.
Critical Warnings:
Never reuse old valves; replace in sets per cylinder.
Avoid lapping unless specified; some OEM valves are coated and require no lapping.
Verify valve seat concentricity (max 0.05 mm runout) before installation.
Post-Installation:
Run engine and listen for unusual valve train noises.
Re-check valve clearance after first 500 km of operation
