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High Performance Original Other Bus Parts 1003321678 Piston Parts Bus Piston Ring Suitable for Yutong Buses

High Performance Original Other Bus Parts 1003321678 Piston Parts Bus Piston Ring Suitable for Yutong Buses

Part Number: 1003321678 is a high-performance piston ring set specifically engineered for Weichai's modern heavy-duty diesel engines, particularly the WP10H series. As a critical component in maintaining combustion efficiency and engine longevity, this piston ring assembly exemplifies Weichai’s leadership in internal combustion sealing technology as of 2026. Designed to meet stringent China VI emission standards, it supports extreme operating conditions with exceptional thermal stability, low friction, and minimal oil consumption. Suitable for heavy-duty commercial vehicles and large construction machinery, this ring set ensures reliable performance over an extended service life—up to 1.8 million kilometers B10 lifespan under proper maintenance.

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Model:
1003321678
Brand:
Yutong Bus Parts

Product Description

Attribute	Description
Part Number	1003321678
Product Type	Piston Ring Set (Three-Piece: Two Compression Rings + One Oil Ring)
Application Engine	Weichai WP10H Series Diesel Engine
Material – Top Ring	Nodular Cast Iron, PVD or Ceramic Coated Outer Surface
Material – Second Ring	Tapered Face Ring, Nodular Cast Iron
Material – Oil Ring	Spiral Spring-Expandable Rail, Chrome Plated or Nitrided Surface
Coating Technology	PVD / Ceramic Coating (Top Ring), Chrome/Nitride (Oil Ring)
Design Feature	Barrel Face (Top), Taper Face (Second), Spring-Loaded Oil Scraper
Emission Standard	Compliant with China VI (National 6) Regulations
Target Applications	Heavy-Duty Trucks, Cranes, Excavators, Construction Equipment
B10 Life Expectancy	Up to 1,800,000 km
Thermal Efficiency	Optimized for Weichai 53.09% High Thermal Efficiency Combustion System
Primary Function	Improved cylinder sealing, reduced blow-by, minimized oil consumption

Parameter	Specification
Ring Configuration	Three-Ring Set: – 1st Ring: Barrel-faced Compression Ring – 2nd Ring: Taper-faced Compression Ring – 3rd Ring: Spring-Expandable Oil Control Ring
Top Ring Material & Finish	Nodular cast iron, outer surface treated with PVD or ceramic coating for wear resistance at high temperatures and pressures
Second Ring Function	Secondary gas sealing and auxiliary oil scraping; tapered face design improves contact and oil control
Oil Ring Design	Three-piece oil ring with helical spring expander; surface chrome-plated or nitrided for durability and low oil consumption
Cylinder Bore Clearance	Minimum end gap: ~0.0035 inches per inch of bore diameter (e.g., ~0.014" for 4" bore)
Operating Temperature	Capable of sustained operation above 600°C at ring groove level
Friction Reduction	Advanced surface treatments reduce frictional losses by up to 12% vs. standard rings
Sealing Performance	Maintains gas tightness under peak firing pressure exceeding 220 bar