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612630010055 Shacman Sinotruck HOWO FAW Foton Dongfeng Cunmmins Weichai Deuzt Truck Engine Spare Parts Cylinder Liner

The Weichai 612630010055 Cylinder Liner is an original equipment (OE) wet-type cylinder liner manufactured by Weichai Power Co., Ltd. — one of China’s leading heavy-duty diesel engine producers. Designed as a core component of large-displacement commercial vehicle engines, this liner forms the precise cylindrical chamber in which the piston reciprocates during combustion.

As a wet liner, it directly contacts engine coolant on its outer surface, enabling excellent heat dissipation and thermal stability — critical for reliable operation under high-load conditions. Widely used in WP12 series engines, this liner is factory-installed on flagship models from major Chinese OEMs such as Shacman (Delong), Sinotruk (HOWO), FAW Jiefang, Foton Auman, and various construction machinery platforms.
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  • 612630010055

  • Sinotruk HOWO Dongfeng FAW

Attribute Description
Product Name Wet Cylinder Liner / Cylinder Sleeve
Type Replaceable wet liner (direct coolant contact)
Material High-strength alloy cast iron with boron or chromium doping; high-phosphorus variant for enhanced wear resistance
Internal Surface Treatment Precision plateau honing with cross-hatch pattern to retain oil film and reduce friction
Cooling Method Direct water-cooled (wet liner design)
Sealing System Dual O-ring seals at top and bottom for watertight integration with cylinder block
Application Heavy-duty diesel engines requiring high thermal load capacity and serviceability
 缸套-2


 缸套-3


Parameter Specification
Part Number (OEM) 612630010055
Bore Diameter (Inner Diameter) 126.00 mm (standard bore)
Outer Diameter (OD) ~137.80 mm
Flange Diameter ~142 mm
Overall Length ~278–280 mm (varies slightly by revision); some references list 342 mm including flange extension depending on measurement method
Liner Protrusion (Standing Height) 0.05 – 0.12 mm above deck surface (must be measured after installation)
Surface Finish Cross-hatched plateau hone (~0.8–1.2 μm Ra) for optimal ring break-in and oil retention
Hardness Rockwell hardness HRC 50–60 (localized hardening on upper lip)
Thermal Conductivity Optimized for rapid heat transfer from combustion chamber to cooling system
Compatibility Standard Meets Weichai OE specifications for WP12 platform and associated powertrains


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