Product Introduction
LF479Q11005011A High-strength Precision-machined Durable Engine Parts Crankshaft for Lifan
The LF479Q11005011A Crankshaft is a premium engine core component engineered for optimal performance. Crafted with high-strength alloy steel, it delivers exceptional durability with a service life exceeding 150,000 km. Designed to convert piston linear motion into rotational power, it ensures stable torque transmission and precise crankshaft rotation (tolerance ≤ 0.02mm). Compliant with ISO/TS 16949 standards, this crankshaft guarantees reliable engine operation, reduces vibration, and maintains efficient power output under extreme working conditions. A critical replacement part for engine maintenance and repair.
Product Advantage
High-Strength Alloy Steel Construction
Crafted from premium forged alloy steel with a carbon content of 0.38-0.45%, this crankshaft boasts tensile strength up to 1200MPa and yield strength of 950MPa. The material undergoes quenching and tempering heat treatment, enhancing wear resistance and fatigue resistance, ensuring a service life exceeding 180,000 km—30% longer than standard alternatives. It maintains structural integrity even under extreme temperature fluctuations (-40℃ to 120℃).
Precision Machining with Tight Tolerances
Equipped with CNC grinding technology, the crankshaft achieves a surface finish of Ra ≤ 0.8μm and dimensional tolerance within ±0.015mm. Each journal is precision-machined to ensure uniform load distribution, reducing friction by 15% and minimizing engine vibration (vibration amplitude ≤ 0.05mm). Compliant with ISO 9001 and IATF 16949 quality standards, it guarantees perfect fit and seamless integration.
Optimized Structural Design for Efficient Power Transmission
The integrated counterweight design balances rotational inertia, improving torque transmission efficiency by 12% and maximizing engine power output. The crankpin and main journal feature a fillet radius of 3.5mm, reducing stress concentration by 25% and preventing crack formation. This design ensures stable operation during high-speed rotation (up to 6500 RPM) without performance degradation.
Rigorous Quality Testing & Certification
Each crankshaft undergoes 8+ quality inspections, including ultrasonic flaw detection, dynamic balance testing (unbalance ≤ 5g·cm), and hardness testing (HRC 28-32). With a defect rate of less than 0.03%, it meets global automotive industry standards. Our production line achieves a monthly output of 5,000+ units, supported by 15 years of crankshaft manufacturing experience.
Corrosion-Resistant & Low-Maintenance
The surface is treated with electrophoretic coating, providing salt spray corrosion resistance for over 500 hours—effectively resisting moisture, oil, and chemical erosion. This treatment eliminates the need for frequent maintenance, reducing long-term ownership costs. The crankshaft’s robust design ensures reliable performance in harsh working environments, from high humidity to dusty conditions.
Technical Parameters
| Parameter | Details |
| Part Number | LF479Q11005011A |
| Product Name | Engine Crankshaft |
| Material | Forged Alloy Steel (C: 0.38-0.45%, Si: 0.17-0.37%, Mn: 0.60-0.90%) |
| Manufacturing Process | Forging + CNC Precision Grinding + Quenching & Tempering Heat Treatment |
| Tensile Strength | ≥ 1200MPa |
| Yield Strength | ≥ 950MPa |
| Hardness (HRC) | 28-32 (journal surface) |
| Surface Finish | Ra ≤ 0.8μm (main journal & crankpin) |
| Dimensional Tolerance | ± 0.015mm |
| Dynamic Balance | Unbalance ≤ 5g·cm |
| Fillet Radius | 3.5mm (crankpin & main journal) |
| Operating Temperature Range | -40℃ to 120℃ |
| Corrosion Resistance | Salt spray test ≥ 500 hours (electrophoretic coating) |
| Service Life | ≥ 180,000 km |
| Quality Certification | ISO 9001, IATF 16949 |
| Defect Rate | ≤ 0.03% |
Product Uses
Here are specific application scenarios of Engine Parts Crankshaft:
Routine Engine Maintenance & Repair
Ideal for replacing worn or damaged crankshafts during regular engine overhauls. Its 0.03% ultra-low defect rate and ISO/IATF-certified quality ensure hassle-free installation and reliable performance, reducing maintenance downtime by 20% compared to generic alternatives. A trusted choice for professional repair workshops and DIY enthusiasts.
High-Duty Working Environments
Engineered to withstand continuous high-load operations (up to 6500 RPM) in harsh conditions—including high humidity, dusty job sites, and extreme temperature fluctuations (-40℃ to 120℃). The 1200MPa tensile strength and corrosion-resistant coating maintain stability for over 180,000 km, suitable for heavy-use engine applications.
Engine Performance Upgrades
Perfect for performance-focused engine modifications. Its precision machining (tolerance ±0.015mm) and optimized counterweight design improve torque transmission efficiency by 12%, enhancing overall power output. Compliant with industry standards, it seamlessly integrates with upgraded engine systems without compatibility issues.
Industrial & Commercial Engine Refurbishment
A core replacement part for refurbishing aging industrial or commercial engines. The forged alloy steel construction and quenching-tempering treatment resist fatigue and wear, extending engine service life by 30%. Backed by 15 years of manufacturing expertise, it meets the rigorous demands of commercial fleet maintenance.
Product Operate Guide
Prior to installation, inspect the crankshaft for surface defects via visual check and confirm dimensional fit (tolerance ±0.015mm). Clean mating surfaces thoroughly to remove debris. Torque fasteners per engine specifications (recommended 45-55 N·m). Post-installation, conduct dynamic balance verification (unbalance ≤5g·cm) and idle test for 15-20 minutes to ensure stable operation. Avoid overloading within the first 500km to maximize service life.
