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- Wanda Plaza, Jinan, Shandong, China
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The WEICHAI WP12 Low Pressure Oil Pipe Group is a complete oil delivery conduit assembly engineered for the WP12 diesel engine platform. This comprehensive group supplies filtered, cooled engine oil from the oil filter and oil cooler to critical engine components such as the turbocharger, air compressor, and main oil gallery. Proper low-pressure oil circuit function is essential for component lubrication and cooling, and the WEICHAI WP12 Low Pressure Oil Pipe Group provides fleet operators and technicians with an OEM-grade solution for maintaining reliable oil flow at pressures typically between 350 and 550 kPa. For genuine replacement parts and comprehensive engine service components, always source from verified WEICHAI Engine Parts to guarantee OEM fitment, consistent quality, and long-term reliability.
The WEICHAI WP12 Low Pressure Oil Pipe Group is a comprehensive assembly of oil delivery conduits that transport filtered and cooled engine oil from the oil filter and oil cooler housing to various engine components operating at low to medium pressure. This assembly includes oil supply pipes, return pipes, connecting hoses, banjo fittings, sealing washers, and mounting hardware. Unlike high-pressure fuel lines, these low-pressure oil lines operate at system pressures typically between 350 and 550 kPa (3.5 to 5.5 bar), with a relief valve limiting maximum pressure to approximately 600 kPa to protect the oil cooler and filter housing.
The low-pressure oil circuit serves multiple critical functions. After the engine oil is drawn from the oil pan by the gerotor-type oil pump, it passes through the oil filter (full-flow) and the oil cooler before entering the main oil gallery. From there, the WEICHAI WP12 Low Pressure Oil Pipe Group directs oil to the turbocharger bearings for cooling and lubrication, to the air compressor for internal lubrication, and to various sensors and actuators. The return pipes then route oil back to the oil pan or to other components in the circuit. This ensures that every lubricated component receives clean, temperature-regulated oil at the correct flow rate.
The WEICHAI WP12 Low Pressure Oil Pipe Group is designed for the 11.596-liter inline-six WP12 engine used in heavy trucks (HOWO T7H, SHACMAN Delong F3000, FOTON Auman, Jiefang), construction machinery (loaders, excavators, bulldozers), marine propulsion, and stationary generator sets. The assembly is compatible with all WP12 variants from Euro III through Euro V emission standards, as well as China VI engines. Key components in this group include the oil supply pipe to the turbocharger (also known as the turbocharger oil feed pipe), the turbocharger oil return pipe, the air compressor oil supply and return pipes, and the main gallery-to-filter connecting pipes. The pipes are manufactured from corrosion-resistant steel tubing with precision-formed ends and sealing washers.
In addition to the basic pipe conduits, the complete WEICHAI WP12 Low Pressure Oil Pipe Group includes all necessary sealing components: copper or aluminum banjo bolt washers (often requiring replacement at every disassembly), O-ring seals for threaded connections, and gaskets for flanged joints. Some variants also include heat shielding sleeves for pipes routed near exhaust components to prevent oil coking from high temperatures. Replacement low-pressure oil pipe groups are available as complete kits or as individual pipes, allowing workshops to replace only damaged sections rather than the entire low-pressure oil circuit.
For marine applications, the WEICHAI WP12 Low Pressure Oil Pipe Group is supplied with additional corrosion-resistant coatings to withstand saltwater exposure. For construction machinery operating in high-vibration environments, the pipes feature reinforced ends and additional support brackets to prevent fatigue cracking. The group’s flow capacity is engineered to match the WP12’s oil pump output, which is typically 50-60 liters per minute at rated engine speed, with the oil cooler capable of dissipating sufficient heat to maintain oil temperature below 110°C.
Every genuine WEICHAI WP12 Low Pressure Oil Pipe Group undergoes 100% pressure testing (typically at 2.0 bar or higher) and dimensional inspection. Counterfeit low-pressure oil pipes often use inferior steel with inconsistent wall thickness or incorrect end forming, leading to leaks, cracks, or flow restriction. Some counterfeit assemblies also omit critical sealing washers or use incorrect grade materials that cannot withstand engine vibration and temperature cycling. Always source from authorized distributors to guarantee proper material composition, precise fitment, and leak-free operation.
| NO. | Part NO | Description |
|---|---|---|
| 1 | 1000338242 | Low Pressure Oil Pipe Group (WP12.430E50, Complete) |
| 2 | 612630030013 | Oil Pipe (Low Pressure Supply Line) |
| 3 | 612630030037 | Pipe Oil Air Compressor (Twin-Cylinder Compressor Supply) |
| 4 | 612630010038 | Oil Pipe Assembly (Main Gallery Connecting Line) |
| 5 | 612600111721 | Turbocharger Oil Return Pipe |
| 6 | 612600112505 | Turbocharger Oil Feed Pipe (Supply Line) |
| 7 | 1000979668 | Injector Oil Return Pipe / Fuel Return Pipe Assembly |
| 8 | 1001234702 | Turbocharger Oil Feed Pipe Fitting (Connector) |
| 9 | 1004220386 | Fuel Return Pipe Assembly (Low Pressure Circuit) |
| 10 | 1004220388 | Fuel Return Pipe Assembly (Alternate Configuration) |
| 11 | 612630111049 | Turbocharger Bracket with Oil Passage |
| 12 | 1000365412 | Oil Pipe Mounting Bracket / Clamp |
| 13 | 612600080819 | Injector Return Oil Pipe Assembly |
| 14 | 612600081630 | Pipe Clamp Assembly (For Low Pressure Lines) |
| 15 | 612630110373 | Engine Oil Pipe (General Purpose Low Pressure Line) |
Our WEICHAI WP12 Low Pressure Oil Pipe Group is manufactured from high-grade corrosion-resistant steel tubing with precision-formed ends. The material selection provides excellent resistance to oil degradation, vibration fatigue, and thermal cycling across the engine’s full operating range from -35°C to 120°C.
Each pipe is bent to exact OEM specifications using CNC tube bending equipment, ensuring proper routing around engine components and maintaining correct flow rates. The internal diameters are optimized to deliver adequate oil volume to turbochargers, air compressors, and other components without pressure drop.
Our low-pressure oil pipe group includes all necessary sealing components: copper or aluminum banjo bolt washers, O-ring seals for threaded connections, and gaskets for flanged joints. Each seal is manufactured to withstand oil temperatures up to 150°C and repeated thermal cycles without hardening or leaking.
Our pipes are manufactured using original WP12 engine drawings, ensuring banjo bolt holes align perfectly with component ports and mounting brackets match factory locations. No modifications required for installation on HOWO T7H, SHACMAN Delong F3000, FOTON Auman, Jiefang, and other WP12-powered vehicles.
Each WEICHAI WP12 Low Pressure Oil Pipe Group includes all required mounting brackets, clamps, banjo bolts, and sealing washers. No need to source separate hardware or risk using incorrect sealing components that could cause leaks.
We stock complete low-pressure oil pipe groups and individual components in warehouses across Asia, Europe, and the Americas. Express shipping options minimize downtime for fleet operators.
Unlike generic aftermarket oil pipes that use low-grade steel tubing prone to corrosion and fatigue cracking, our WEICHAI WP12 Low Pressure Oil Pipe Group is manufactured to original equipment specifications. The tubing is drawn from high-strength material with consistent wall thickness and undergoes a stress-relief annealing process after bending to eliminate residual stresses that could lead to cracking under vibration. The pipe ends are precisely formed to accept banjo bolts with proper sealing washer contact, preventing the leaks that plague cheap replacements.
Furthermore, our low-pressure oil pipe group includes high-quality copper or aluminum sealing washers that are annealed to the correct hardness for proper compression. Many low-cost kits use washers that are either too hard (failing to seal) or too soft (extruding under torque). Our sealing washers are batch-tested for material composition and hardness, ensuring a leak-free seal every time. For pipes routed near exhaust components, we include heat shielding sleeves to prevent oil coking from radiant heat.
Technical documentation included with the WEICHAI WP12 Low Pressure Oil Pipe Group provides correct banjo bolt torque specifications (25-35 Nm for M12 banjo bolts, 20-30 Nm for M10 threaded fittings), sealing washer orientation instructions (ensure washers are centered on the bolt before tightening), and a troubleshooting guide for common issues such as oil seepage (replace sealing washers) and restricted flow (check for kinked or crushed pipes).
For large fleet customers, we offer sample evaluation: order one WEICHAI WP12 Low Pressure Oil Pipe Group for trial installation. After validation, volume pricing applies. Many return customers report that our low-pressure oil pipe groups exceed the original equipment service life, with over 600,000 km of leak-free operation, compared to low-cost alternatives that often develop leaks or cracks within 150,000 km.
Beyond the checklist above, pay attention to any change in oil consumption without visible external leaks. A small leak in a low-pressure oil pipe may only weep oil under certain operating conditions (high temperature, high load) and may not leave puddles on the ground. Use a UV dye additive in the engine oil and a black light to identify slow leaks that are otherwise invisible. This technique is especially useful for finding leaks at banjo bolt connections where oil may be dripping onto hot engine surfaces and burning off before reaching the ground.
For engines operating in severe service (construction equipment, mining trucks, continuous high-load operation), consider more frequent pipe inspections every 50,000 km. The constant vibration from rough terrain accelerates fatigue cracking at pipe ends and mounting brackets. For marine applications, inspect the WEICHAI WP12 Low Pressure Oil Pipe Group annually for saltwater corrosion, paying special attention to the turbocharger oil feed pipe and air compressor supply line. Replace any pipes showing rust pitting deeper than 0.5 mm.
When replacing a damaged low-pressure oil pipe, always install new sealing washers and inspect the mating surfaces on the component (turbocharger, air compressor, oil filter housing) for damage or debris. A scratch on the sealing surface will cause a leak even with a new pipe and washers. Clean all mating surfaces with a lint-free cloth and solvent before assembly. After installation, run the engine at idle for 5 minutes, then inspect all connections for leaks. Re-torque any banjo bolts that show seepage (no more than an additional 5 Nm).
Finally, maintain a service log for the WEICHAI WP12 Low Pressure Oil Pipe Group recording installation dates, sealing washer replacement intervals, observed leaks, and any pipe replacements. This data helps predict when components are approaching end of life. For fleet operators, standardized replacement of turbocharger oil feed pipes every 300,000 km and complete low-pressure oil pipe group inspections every 100,000 km eliminates oil leak-related breakdowns and protects turbochargers and air compressors from oil starvation.
In summary, the WEICHAI WP12 Low Pressure Oil Pipe Group is an essential part of the WP12 engine’s lubrication system. Its robust steel construction, precision-formed ends, and high-quality sealing components ensure reliable oil delivery to critical components throughout the engine’s service life. Whether you are replacing a cracked turbocharger oil feed pipe on a HOWO T7H tractor, maintaining a fleet of SHACMAN Delong F3000 dump trucks, or servicing a WP12 marine propulsion engine, using a genuine low-pressure oil pipe group ensures that every lubricated component receives the correct oil flow at the proper pressure.
For workshops performing turbocharger or air compressor replacement, we recommend ordering the WEICHAI WP12 Low Pressure Oil Pipe Group together with new sealing washers, banjo bolts, and mounting hardware. The low-pressure oil pipes must be disconnected to remove these components; renewing the sealing components ensures that the reassembled engine’s lubrication system is as reliable as new. We provide installation guides with torque specifications, sealing washer handling instructions, and leak diagnostic procedures for all WP12 engine variants.
Our inventory includes both standard low-pressure oil pipe groups for on-highway trucks and heavy-duty versions with reinforced ends and additional heat shielding for construction and marine applications. For generator sets where the engine operates at constant speed, we offer pipes with extended-life sealing washers rated for 10,000+ operating hours. Specify your application when ordering to receive the correct configuration.
We also provide after-sales documentation including material certificates, pressure test reports, and dimensional inspection data upon request. Every WEICHAI WP12 Low Pressure Oil Pipe Group is packaged in a foam-lined box with separate compartments for each pipe to prevent damage during transit. Bulk orders receive custom export crating and documentation.
All specifications are based on original WEICHAI WP12 engine data. Actual product configurations may vary by sub-model (Euro III, Euro V, marine, construction, etc.). Always verify part numbers against your engine’s serial number plate before ordering.
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If you have any questions about our products, services, or anything related to what we offer, please don’t hesitate to leave us a message—our dedicated team is always ready to provide prompt and helpful responses to address your concerns. What’s more, when you become our valued customer, we’re delighted to offer you complimentary catalog services, giving you access to detailed, up-to-date information on our full range of products, specifications, and offerings to help you make informed decisions.
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