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Original Factory Yuchai 6J125 Engine Camshaft 630-1006015A Used for Yutong Bus

The 630-1006015A Engine Camshaft Assembly is an original equipment (OE) high-performance camshaft designed for Yuchai YC6J and YC6G series 6-cylinder diesel engines such as the YC6J190, YC6J210, and YC6J230. As the central control unit of the engine’s valvetrain system, it precisely governs the timing, duration, lift, and overlap of intake and exhaust valve events—directly influencing combustion efficiency, power output, fuel economy, and emissions performance.

Manufactured from high-strength alloy cast iron or forged alloy steel, this camshaft features induction-hardened lobes (HRC ≥55) to ensure exceptional wear resistance under high-load operation. Each lobe is ground on CNC cam grinders to meet strict dimensional tolerances required by modern Euro V/China VI emission standards.

Used across passenger coaches, medium-duty trucks, sanitation vehicles, and construction machinery, this camshaft supports quiet valve train operation and optimal cylinder filling when paired with the correct pushrods, tappets, and rocker arms.
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  • 630-1006015A

  • Yutong Bus Parts

Attribute Description
Part Number (OE) 630-1006015A / 6301006015A
Product Name Engine Camshaft Assembly
Common Names Diesel Camshaft, Valve Timing Shaft
Application Engine Yuchai YC6J Series (e.g., YC6J190, YC6J210, YC6J230), YC6G
Number of Cylinders 6-Cylinder Inline Configuration
Material Type High-Strength Alloy Cast Iron or Forged Alloy Steel
Hardening Process Surface Induction Hardening (Cold Quenching)
Lobe Hardness (HRC) ≥55 (extremely wear-resistant)
Shaft Features Axial Positioning Flange + Gear Mounting End
Drive Mechanism Gear-driven (from crankshaft via idler gear)
Design Standard Meets GB/T 18488, ISO 8178, and Yuchai OE specifications
凸轮轴-3


凸轮轴-1


Parameter Specification
Total Length (Approx.) ~750 mm (varies slightly by model)
Journal Diameter Tolerance ±0.005 mm (precision-ground for low friction and oil retention)
Cam Lobe Profile Optimized for Euro V/VI emissions: smooth ramp design reduces noise and impact
Valve Event Control Controls intake & exhaust valve opening/closing timing
Lift (Intake/Exhaust) Model-specific; typically 12–16 mm total lift (verify per engine variant)
Duration (Typical @ 1mm) Intake: ~230°–250° CA
Exhaust: ~235°–255° CA
Surface Finish (Ra) <0.8 μm (ultra-smooth finish for reduced scuffing)
Axial Play (End Float) 0.05 – 0.15 mm (controlled by thrust flange)
Service Life 600,000 km or 10,000+ hours under proper maintenance


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