2020717（2027367+2021446) Main bearing bush assembly WEICHAI WP4

WP4.1 Main Bearing Set Product Introduction1. Basic SpecificationsApplicable EngineFor Weichai WP4.1 diesel engine. Widely used on light trucks, construction machinery, agricultural machinery, generator sets, small air compressors, covering power range 74–103kW. Compatible with China National IV non-road, National V & National VI road emission standards.Material & Structure

Steel Back Base Adopts high-quality low-carbon structural steel by stamping molding. Integrated locating tangs on the back prevent displacement and ensure precise interference fit during assembly.

Wear-resistant Alloy Layer Lead-free eco-friendly tin-rich aluminum-tin-copper alloy, stable under high temperature and high pressure of diesel engines. Uniform alloy thickness with tolerance ±0.005mm. Inner surface precision honed with oil grooves and oil holes.

Thrust Washers Double-sided composite wear-resistant alloy, limiting crankshaft axial movement and buffering impact loads.

Machining StandardAll inner/outer diameters, oil channels and locating bosses are produced strictly per original factory drawings. Matching clearance meets OEM standard without secondary grinding. Accurate oil holes guarantee smooth lubricant circulation.2. Key Product Features

Complete set design for one-stop engine overhaul Full matching components for all main bearing positions. Avoid separate purchasing and reduce order errors for direct replacement.

Precision oil channel design for stable lubricating film Circular oil grooves and axial oil holes evenly distribute engine oil during operation, forming a full liquid lubricating film to eliminate dry friction, crankshaft scuffing and bearing burning issues.

Anti-rotation locating tang on each bearing shell Integrated stamped locating tabs lock shells tightly in bearing seats. No shifting or rotation under high speed and heavy loads to maintain stable assembly clearance.

Hot-rolled bimetal composite for strong bonding Steel substrate and wear-resistant alloy are integrally hot-rolled. The alloy layer resists peeling, cracking, high temperature and fatigue impact under long heavy-duty operation.

Dual-side wear-resistant thrust washers to control crankshaft float Double-sided alloy surface offsets axial force from clutch and transmission, stopping front-rear crankshaft movement and protecting crankshaft oil seals and cylinder block end faces.

Passivation anti-rust surface treatment Entire finished parts go through passivation anti-rust treatment. Individually packed in moisture-proof cartons to resist oxidation during long-term sea transportation and warehouse storage, ready for direct installation.

3. Core Advantages

Outstanding durability for heavy-duty diesel working conditions Aluminum-tin alloy stably works under continuous 160℃ with excellent impact resistance against high combustion pressure of WP4.1 turbo engines. Service life increases by 40% compared with ordinary babbitt bearings with minimal wear for construction and farm machinery.

Protect crankshaft and cut maintenance cost The alloy layer features superior conformability and embeddability to trap tiny oil impurities and avoid scratches on costly crankshaft journals. Bearings wear first instead of crankshafts, saving huge replacement expenses.

Perfect interchangeability with OEM parts Manufactured per original dimensional drawings with identical tolerances. Direct replacement of genuine parts without abnormal noise from excessive clearance or seizure from insufficient clearance. Universal for all WP4.1 derivative models with easy stocking for distributors.

Good anti-seizure performance for cold start The alloy layer provides self-lubrication when oil pressure is low during cold startup, preventing scuffing and seizure under frequent short-distance running.

Standard complete set packaging for repair & foreign trade Independent individual packaging simplifies warehouse picking and weight/volume calculation for container shipment. Clear OEM reference numbers reduce wrong delivery and after-sales returns.

Eco-friendly formula for global export Lead-free wear-resistant alloy complies with environmental import standards of EU, Africa, Southeast Asia without heavy metal customs barriers.

4. Application Scenarios

Road transport: 4.2m light trucks, box trucks, refrigerated trucks with WP4.1 power

Construction equipment: small loaders, drill rigs, air compressors, auxiliary excavation machines

Agricultural machinery: harvesters, tractors, straw crushers

Stationary power: small diesel generator sets, marine auxiliary engines

5. Packaging & Storage

Single set package: moisture-proof hard carton with anti-rust paper inner wrapping

Master carton: 20 sets per export carton, easy pallet loading and shipping volume calculation

Storage condition: dry & ventilated warehouse, moisture and corrosion prevention, 12-month shelf life