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Genuine Sinotruk HOWO 082V02503-6812 Piston Ring Set
This authentic Sinotruk HOWO piston ring set (Part No: 082V02503-6812) is engineered to exact OEM specifications, ensuring optimal engine performance and longevity for HOWO trucks. Designed for heavy-duty applications, this precision ring set provides critical sealing between the piston and cylinder wall, maintaining compression, controlling oil consumption, and reducing emissions under extreme operating conditions. The set includes compression and oil control rings manufactured from high-grade materials to withstand high temperatures and pressures, making it an essential replacement for engine overhauls and maintenance.
Technical Specifications:
Material: Top ring: Plasma-coated molybdenum steel; Second ring: Gray cast iron with chrome plating; Oil ring: Spring steel with chrome-faced rails
Diameter: 126.5 ± 0.05 mm (fits standard HOWO cylinders)
Ring Width: 1.5 mm (compression rings), 3.0 mm (oil ring)
Tension: Oil ring tension 35-45 N; Compression ring tension 20-30 N
Temperature Resistance: -40°C to +300°C continuous operation
Compatibility: HOWO A7, T7H series with WEICHAI WP10/WP12 engines
Surface Finish: Precision honed and polished (Ra ≤ 0.1 μm)
Manufacturing Standard: ISO 9001 certified, OEM tolerances
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Installation Notes
Pre-Installation Checklist:
1.Inspect Components: Verify part number (082V02503-6812) and check for shipping damage or corrosion.
2.Cylinder Preparation: Ensure cylinder walls are properly honed (cross-hatch pattern 45°) and cleaned.
3.Clearance Check: Measure ring end gap (0.25-0.40 mm for compression rings, 0.15-0.30 mm for oil ring) using feeler gauges.
4.Lubrication: Apply clean engine oil to rings and piston grooves before installation.
Installation Steps:
1.Ring Positioning: Install rings using proper ring expander tool, ensuring correct order and orientation (mark "TOP" facing upward).
2.Gap Staggering: Stagger ring end gaps 120° apart to prevent compression leakage.
3.Piston Installation: Carefully insert piston into cylinder using ring compressor tool.
4.Verification: Rotate crankshaft to ensure free movement without binding.
Critical Warnings:
Never reuse old piston rings – always replace with new sets per cylinder.
Avoid over-expanding rings during installation to prevent permanent deformation.
Verify ring side clearance (0.03-0.07 mm) to prevent ring sticking.
Post-Installation:
Prime oil system before initial startup.
Run engine at varying RPMs for initial ring seating (avoid prolonged idle).
Monitor oil consumption and compression after first 500 km of operation
