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L4700-11041B0 High Pressure Oil Pipe Is Suitable for Yuchai Engine diesel Engine Parts High Pressure Oil Pipe

L4700-11041B0 High Pressure Oil Pipe Is Suitable for Yuchai Engine diesel Engine Parts High Pressure Oil Pipe

The L4700-11041B0 High-Pressure Fuel Pipe Assembly is an original equipment (OE) precision fuel line manufactured by Guangxi Yuchai Machinery Co., Ltd., designed to deliver high-pressure diesel from the common rail or injection pump to the second cylinder injector on Yuchai YC6L and YC6M series heavy-duty diesel engines.

As a vital component of the engine’s common rail injection system, this pipe operates under extreme conditions—carrying fuel at pressures exceeding 1,600–2,000 bar (23,000–29,000 psi) during each injection cycle. It features precision-formed seamless steel tubing with spherical metal-to-metal sealing ends and high-strength threaded nuts, ensuring leak-free performance and long-term reliability.

Used across commercial trucks, buses, construction machinery, and power generation units, this fuel pipe ensures accurate fuel metering, stable combustion, and low-noise operation. Its exact curvature and length are engineered to match the cylinder head layout of YC6L/M platforms, minimizing stress and vibration fatigue.

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Model:
L4700-11041B0
Brand:
Yutong Bus Parts

Product Description

Attribute	Description
Part Number (OE)	L4700-11041B0
Product Name	No. 2 Cylinder High-Pressure Fuel Pipe / High-Pressure Injector Line
Common Names	HP Fuel Tube, Common Rail Injector Pipe, Diesel Injection Line
Application Engine	Yuchai YC6L Series (e.g., YC6L-33, YC6L-42), YC6M Series
Target Cylinder	Second Cylinder (Firing Order: B0 = Cylinder #2)
Material	Cold-drawn seamless stainless steel tube
Connection Type	Dual spherical seat with internal nut (metal-to-metal seal)
Sealing Method	ISO 8434-1 compliant ball-seat interface
Weight (Approx.)	0.4 – 0.6 kg
Design Standard	Meets GB/T 19055, ISO 8434, and Yuchai OE specifications

Parameter	Specification
Maximum Operating Pressure	Up to 2,000 bar (29,000 psi) peak injection pressure
Burst Pressure Rating	>3,000 bar (tested during production)
Tensile Strength	≥700 MPa
Pipe Diameter (OD)	Typically Φ6 mm or Φ8 mm (varies by engine model)
Wall Thickness	~1.5 – 2.0 mm (high-pressure integrity)
Length & Bend Profile	Custom-bent to fit YC6L/YC6M cylinder head geometry
Vibration Resistance	Designed to withstand continuous pulsation without fatigue cracking
Service Life	Lifetime design; replace only if damaged or leaking
Installation Torque (Typical)	25 – 35 N·m (follow Yuchai official workshop manual)