Shacman WP12 Oil-Gas Separator Group

The Shacman WP12 Oil-Gas Separator Group is a complete, factory‑matched crankcase ventilation system for the WP12 diesel engine. This comprehensive group includes the separator, brackets, hoses, clamps, fasteners, and return lines, ensuring efficient oil mist separation and reliable crankcase pressure regulation for heavy‑duty commercial vehicles.

This group integrates the Hexagon Nut, Back‑up Block, Oil‑gas Separator Bracket, Oil‑gas Separator, Hexagon Flange Bolt, Clamp, Oil Connecting Rubber Pipe, Oil‑gas Separator Oil‑return, Oil‑gas Pre‑separator, Air Connecting Rubber Pipe, Pipe Clamp, Hexagon Head Bolt, Pre‑separator Oil‑return Pipe, Gasket, and flat washers. Each component is manufactured to exacting OEM standards, guaranteeing a perfect fit, efficient separation, and long‑term durability in harsh engine environments.

The WP12 platform is known for its robust emission control. The Shacman WP12 Oil-Gas Separator Group features a high‑efficiency cyclone or coalescing separator, reinforced rubber hoses, and corrosion‑resistant clamps, providing consistent oil mist removal and crankcase pressure control over millions of kilometers.

With a focus on operational reliability, this oil‑gas separator group delivers effective oil‑air separation, reduced oil carryover, and extended turbocharger life. It is the preferred choice for fleet operators and workshops seeking genuine Shacman quality and dependable aftermarket support worldwide.

Every component within the Shacman WP12 Oil-Gas Separator Group undergoes rigorous dimensional inspection, material verification, and pressure testing. This ensures that the assembly meets or exceeds original equipment specifications, providing peace of mind and long‑term reliability in the most demanding conditions.

Designed for high‑mileage operations, the WP12 separator group offers superior resistance to oil degradation and thermal stress. The integration of high‑quality rubber hoses, secure clamps, and a robust separator housing guarantees consistent separation efficiency and minimal maintenance, preventing oil sludge build‑up and protecting the intake system.

Shacman’s commitment to quality is evident in every detail of the Shacman WP12 Oil-Gas Separator Group. From the metallurgy of the bracket to the sealing properties of the rubber pipes, every parameter is optimized for maximum durability and safety under extreme operating conditions.

This oil‑gas separator group is fully compatible with existing WP12 engines, enabling seamless replacement and upgrade. It reduces downtime and simplifies maintenance, making it an ideal solution for workshop rebuilds and preventive maintenance programs across global markets.

Field data confirms that engines equipped with the Shacman WP12 Oil-Gas Separator Group consistently deliver lower total cost of ownership. Efficient oil separation reduces oil consumption, prevents turbocharger fouling, and extends DPF life, contributing to significant operational savings for fleet managers.

Trusted by operators in more than 60 countries, the Shacman WP12 Oil-Gas Separator Group is a global benchmark for heavy‑duty crankcase ventilation reliability. Its proven design and robust construction make it a cornerstone of modern commercial vehicle emission systems.

The oil‑gas separator is a precision‑engineered unit with internal baffles or coalescing media that effectively removes oil mist from crankcase gases, returning liquid oil to the sump while venting clean air back to the intake. Its housing is made of heat‑resistant polymer or aluminum.

The oil connecting rubber pipes are manufactured from high‑temperature NBR or silicone with reinforced braiding, ensuring flexibility and resistance to oil and heat. Their precise inner diameters and lengths match the engine layout for direct fitment.

The clamps and pipe clamps are made of stainless steel or zinc‑plated steel with a worm‑drive or spring‑loaded design, providing secure, leak‑free connections that resist vibration and thermal expansion.

The brackets and back‑up blocks are precision‑stamped or cast from steel with corrosion‑resistant coating, providing rigid mounting for the separator and hoses, ensuring proper alignment and preventing chafing.

Installation is straightforward with all components pre‑matched. The group includes all necessary fasteners, gaskets, and sealing washers, ensuring a complete, hassle‑free replacement. Detailed torque specifications are provided for accurate assembly.

Hexagon Nut – A high‑strength threaded nut used to secure various components of the oil‑gas separator group, such as the bracket or pipe connections. Manufactured from alloy steel with a zinc‑plated finish, these nuts provide reliable clamping force and resistance to loosening under vibration. They are used in conjunction with bolts or studs and are designed for easy tightening with standard wrenches. Their precise thread pitch and class fit ensure consistent torque retention. These nuts are critical for maintaining the integrity of the separator assembly, and they should be replaced if damaged or corroded.

Back‑up Block – A rigid steel or cast‑iron reinforcement plate that provides additional support to the oil‑gas separator or its mounting bracket, preventing distortion and ensuring even load distribution. Manufactured from high‑strength material with a corrosion‑resistant finish, this block is positioned under the bolt heads or at strategic points on the bracket. Its precise thickness and flatness compensate for minor surface irregularities, reducing stress on the bracket and separator housing. This back‑up block is critical for maintaining sealing integrity and preventing fatigue fractures, especially under high vibration conditions.

Oil‑gas Separator Bracket – A precision‑stamped or cast metal component that securely mounts the oil‑gas separator to the engine block or chassis. Manufactured from high‑strength steel with a corrosion‑resistant coating, this bracket features accurately positioned mounting holes and a contoured shape that matches the separator housing. Its rigid design minimises vibration and ensures correct alignment of the separator with the crankcase ventilation hoses. The bracket includes reinforced gussets to resist bending and is designed for easy installation with standard tools. This bracket is essential for maintaining the separator’s position and preventing hose stress.

Oil‑gas Separator – The primary component that removes oil mist from crankcase gases, preventing oil carryover into the intake system. Manufactured from heat‑resistant polymer or aluminum with internal baffles, coalescing media, or cyclone vanes, this separator efficiently separates oil droplets from the gas stream. The separated oil drains back to the oil pan via a return line, while the cleaned gases are routed to the turbocharger intake. The separator is designed for low pressure drop and high separation efficiency (typically >95%). It is a direct replacement for the original factory unit, ensuring identical performance and durability. Regular maintenance includes draining accumulated oil and inspecting for clogging.

Hexagon Flange Bolt – A high‑strength fastener with an integrated flange that secures the separator bracket, separator housing, or other components to the engine. Manufactured from alloy steel, heat‑treated to grade 10.9, and coated with a zinc‑plated finish, these bolts provide consistent clamping force under high vibration and thermal cycling. The flange distributes load evenly, preventing galling on mating surfaces. A pre‑applied thread‑locking compound prevents loosening. Their precise length and thread pitch are matched to the specific mounting points. These bolts are critical for maintaining assembly integrity and should be replaced if damaged.

Clamp – A robust fastening device used to secure rubber hoses to the separator or pipe connections, ensuring leak‑free joints. Manufactured from stainless steel or zinc‑plated carbon steel with a worm‑drive or spring‑loaded mechanism, these clamps provide uniform compression around the hose. Their design allows for easy installation and adjustment, accommodating thermal expansion and hose ageing. The clamp’s band width and screw mechanism are engineered to prevent hose damage while maintaining a secure grip. This clamp is essential for preventing oil or air leaks and is critical for the reliable operation of the crankcase ventilation system.

Oil Connecting Rubber Pipe – A flexible, oil‑resistant hose that connects the oil‑gas separator to the oil pan or return line, allowing separated oil to drain back. Manufactured from high‑temperature NBR or silicone rubber with a reinforcement layer, this pipe is designed to withstand continuous oil exposure, heat (up to 120°C), and pressure fluctuations. Its inner diameter and length are precisely matched to the engine layout, ensuring a direct fit. The pipe is resistant to swelling and cracking, maintaining its integrity over the life of the engine. This pipe is essential for returning oil to the sump and preventing oil accumulation in the separator.

Oil‑gas Separator Oil‑return – A specific component (often a pipe or fitting) that directs the separated oil from the separator back to the engine oil sump. This part may be a rigid steel tube or a flexible hose with special connectors, designed to handle the oil flow without restrictions. Its internal diameter and routing are optimized to ensure gravity‑assisted return, preventing oil back‑up. The oil‑return line is typically equipped with a check valve or a simple open tube, and it is critical for maintaining the separator’s efficiency by continuously removing collected oil. This component is a direct replacement for the original factory part.

Oil‑gas Pre‑separator – A secondary or preliminary separation device that removes a large portion of oil mist before the main separator, enhancing overall separation efficiency. Manufactured from durable plastic or metal, this pre‑separator often uses inertial or cyclone action to drop heavier oil droplets out of the gas stream. It is installed upstream of the main separator and is especially useful in high‑load conditions. Its design ensures low maintenance and is often integrated into the valve cover or breather system. This pre‑separator helps reduce the load on the main separator, extending its service life and improving overall crankcase ventilation performance.

Air Connecting Rubber Pipe – A flexible hose that carries the cleaned crankcase gases from the oil‑gas separator to the engine intake system (turbocharger or air filter). Manufactured from high‑temperature silicone or EPDM rubber with reinforcement, this pipe is designed to handle hot, oily air without degradation. Its inner diameter and length are matched to the engine plumbing, ensuring minimal restriction and proper routing. The pipe is resistant to oil vapours and ozone, maintaining flexibility and sealing integrity over time. This pipe is essential for returning filtered air to the combustion process, reducing emissions and improving fuel economy.

Pipe Clamp – A specialised clamp used to secure rigid or semi‑rigid pipes in the oil‑gas separator system, providing a firm grip without damaging the pipe surface. Manufactured from spring steel or zinc‑plated steel with a rubber cushion or a band‑type design, this clamp offers vibration resistance and easy adjustment. Its design ensures that the pipe remains securely in place, preventing chafing and disconnection. The pipe clamp is essential for maintaining proper routing and preventing hose movement that could lead to leaks or abrasion. This component is a direct replacement for the original clamp.

Hexagon Head Bolt – A standard high‑strength bolt with a hexagonal head, used to fasten various components such as brackets, separators, and clamps. Manufactured from alloy steel with a zinc‑plated finish, these bolts provide reliable clamping force and are heat‑treated to grade 10.9. Their head design allows for easy torque application with standard wrenches or sockets. They are available in various lengths and thread pitches to match specific mounting points. These bolts are critical for maintaining the structural integrity of the separator group and should be replaced if threads are damaged or if corrosion is evident.

Pre‑separator Oil‑return Pipe – A dedicated tube or hose that returns oil collected by the pre‑separator back to the oil pan. Manufactured from corrosion‑resistant steel or high‑temperature rubber, this pipe is designed to handle the oil flow from the pre‑separator without clogging. Its routing is engineered to ensure gravity drainage and prevent oil backup, maintaining the efficiency of the pre‑separator. This pipe is essential for the proper functioning of the two‑stage separation system, and its replacement is recommended if damaged or obstructed.

Gasket – A precision‑cut sealing component that prevents oil or air leaks between mating surfaces of the separator, bracket, or pipe connections. Manufactured from high‑quality oil‑resistant cellulose fibre, rubber, or composite material, this gasket provides a reliable, leak‑tight seal under varying temperatures and pressures. Its material is compressible, conforming to minor surface imperfections. The gasket is designed for single use; it must be replaced every time the component is removed to ensure proper sealing. This gasket is critical for maintaining the integrity of the crankcase ventilation system, preventing oil loss and maintaining pressure balance.

flat washers – A hardened, flat circular disc used under bolt heads or nuts to distribute clamping load and protect the mounting surface. Manufactured from carbon steel with a zinc‑plated finish, these washers provide a uniform bearing surface that prevents galling and maintains torque retention. They are used in conjunction with bolts and nuts to ensure even load distribution, reducing stress on the components. Flat washers are essential for preventing damage to soft materials like aluminum and for maintaining consistent clamp load over time. These washers are supplied with the group and should be replaced if deformed or corroded.

High‑Efficiency Separation
The separator and pre‑separator use a combination of cyclone and coalescing technology to achieve >95% oil mist removal efficiency.

Durable Rubber Compounds
All hoses are made from high‑grade NBR or silicone with reinforcement, resistant to oil, heat, and ozone for long service life.

Corrosion‑Resistant Hardware
All fasteners and clamps are zinc‑plated or stainless steel, ensuring reliable retention and resistance to rust.

Heavy‑duty long‑haul trucks and tractor‑trailers

Construction and mining dump trucks

Intercity and transit buses

Agricultural and forestry machinery

Marine auxiliary power units

Stationary generator sets and pumps

Performance Summary: The Shacman WP12 Oil-Gas Separator Group is designed for engines up to 480 HP and 2200 N·m of torque. With a proven service life exceeding 1.5 million kilometers, it delivers efficient oil mist separation, reliable crankcase pressure control, and minimal maintenance, contributing to overall engine cleanliness, reduced oil consumption, and enhanced emission compliance.

Preparation & Cleaning
Clean all mating surfaces and hose connections. Inspect the separator and pre‑separator for damage. Lubricate hose ends with a light coat of oil to ease installation.

Installation & Torque
Mount the bracket and separator, secure with bolts and nuts, and torque to the specified values (typically 20‑30 N·m for brackets, 5‑10 N·m for hose clamps). Ensure all hoses are routed without kinks.

Periodic Monitoring
Regularly check for oil leaks around the separator and hoses. Inspect clamps for tightness and hoses for cracks or swelling. Replace the separator element (if applicable) at recommended intervals.

Quality Certifications & Standards
The Shacman WP12 Oil-Gas Separator Group complies with ISO 9001:2015 and IATF 16949 quality management standards. All components are manufactured in facilities certified to ISO 14001 environmental standards, ensuring sustainable production practices.