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Yuchai J4200-1003190B Cylinder Head Assembly for Yutong Bus Spare Parts

The J4200-1003190B Cylinder Head Cover Assembly, commonly known as the valve cover, is an original equipment (OE) engine top cover designed specifically for Yuchai YC6J and YC6A series 6-cylinder electronically controlled common rail diesel engines. As a key sealing and functional component located on the upper section of the cylinder head, it prevents oil leakage from the valvetrain area while integrating an advanced positive crankcase ventilation (PCV) system with internal oil-gas separator (breather chamber).

Constructed from high-strength composite engineering plastic, this valve cover offers significant advantages over older aluminum designs—including reduced weight, improved vibration damping, and enhanced noise insulation (NVH performance)

It features a precision-molded design with integrated channels and baffles that separate oil mist from blow-by gases before they are recirculated into the intake system, helping reduce oil consumption and meet strict China VI / Euro V emission standards

Used across Yutong ZK6107/ZK6119, Higer KLQ6109, King Long XMQ6109, and other medium-duty trucks and special-purpose vehicles

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Model:
J4200-1003190B
Brand:
Yutong Bus Parts

Product Description

Attribute	Description
Part Number (OE)	J4200-1003190B / J42001003190B
Product Name	Cylinder Head Cover Assembly / Valve Cover
Common Names	Valve Room Cover, Rocker Cover, Oil Seal Cover
Application Engine	Yuchai YC6J, YC6A Series (6-Cylinder Common Rail Diesel)
Material Type	High-Strength Reinforced Composite Engineering Plastic
Alternative Material (Older Models)	Die-Cast Aluminum (e.g., early versions)
Integrated Function	Internal Oil-Gas Separator (Breather Chamber)
Sealing Method	Molded Rubber Gasket or Pre-Cut Elastomer Seal
Mounting Style	Bolt-on with multiple M6/M8 screws around perimeter
Design Standard	Meets GB/T 19055, ISO 6753, and Yuchai OE specifications

Parameter	Specification
Weight (Approx.)	1.8 – 2.5 kg (lighter than metal version)
Torque Requirement (Typical)	10 – 15 N·m (critical: over-tightening causes cracks)
Oil-Gas Separation Efficiency	>90% oil recovery rate under standard operating conditions
Temperature Resistance	-40°C to +130°C (resists thermal aging and deformation)
Vibration Damping (NVH)	Excellent; reduces mechanical noise from rocker arms and valves
Seal Compatibility	Requires genuine Yuchai rubber gasket (recommended replacement each time)
Ventilation Outlet Size	Standard hose port (Φ12–Φ16 mm) for PCV line connection
Service Life	8–10 years or 600,000 km under proper maintenance
Emission Compliance Support	Contributes to reduced oil consumption and cleaner crankcase emissions