【Zhejiang, China】 - After over a year of technical breakthroughs and process validation, Zhejiang Weilin Mechanical Co., Ltd. today officially announces that its high-performance forged steel crankshaft for the Yanmar 6AY series marine engine-the YANMAR 6AY crankshaft-has successfully completed all R&D and trial production phases and is now entering mass production, available for global shipment. This milestone product launch marks a solid step forward for Zhejiang Weilin Mechanical in the high-end marine propulsion core component sector, providing shipowners, marine repair yards, and power service providers worldwide with a trustworthy, high-quality alternative to OEM parts.
Born for the Sea: Tailored for Yanmar 6AY Marine Power
The Yanmar 6AY series engines (including models such as 6AYM-WET and 6AYM-WGT) are widely used in global merchant vessels, fishing boats, tugboats, and workboat fleets, renowned for their compact design, high power density, and excellent fuel economy. However, with aging fleets and fluctuations in original supply chains, the market has an urgent need for a high-quality replacement crankshaft with stable performance, reliable supply, and reasonable pricing.
Leveraging over a decade of technical accumulation in forged steel crankshafts and a deep understanding of the unique operating conditions of marine propulsion, Zhejiang Weilin Mechanical has successfully developed the YANMAR 6AY crankshaft. This product strictly adheres to Yanmar's original design specifications, incorporating multiple optimizations in material, process, and inspection to deliver reliability and durability that exceed expectations.
Technical Highlights: An Engineering Masterpiece for Harsh Sea Conditions
The all-new YANMAR 6AY crankshaft integrates multiple core technologies from Zhejiang Weilin Mechanical:
· Material Upgrade: Manufactured from high-strength, high-purity special alloy forging steel with excellent fatigue resistance and corrosion resistance, capable of withstanding the harsh, high-humidity, high-salt-spray marine environment.
· Full-Fiber Precision Forging: Utilizes multi-thousand-ton presses for full-fiber die forging, ensuring continuous, dense metal grain flow, significantly enhancing bending fatigue strength and impact toughness.
· Deep Nitriding Treatment: Deep gas nitriding is applied to main and connecting rod journals, achieving case depth of 0.4-0.6mm and surface hardness ≥650HV, greatly improving wear resistance and fretting corrosion resistance, extending overhaul intervals.
· Ultra-High Precision Machining: Leveraging high-precision CNC crankshaft grinders and 5-axis machining centers, journal roundness, cylindricity, and phase angle accuracy are controlled to micron levels, ensuring smooth engine operation with minimal vibration.
· 100% Non-Destructive Testing: Every YANMAR 6AY crankshaft undergoes 100% magnetic particle testing (MT) and critical-area ultrasonic testing (UT), ensuring no internal or surface defects and eliminating the risk of premature failure.
DCT CRANKSHAFT
6AY CRANKSHAFT
6AY CRANKSHAFT
6AY CRANKSHAFT
6AY CRANKSHAFT
6AY CRANKSHAFT
6AY CRANKSHAFT
Customer Value: Delivering Tangible Benefits to Shipowners
For shipowners and vessel operators, choosing the YANMAR 6AY crankshaft means:
· Longer Overhaul Intervals: Exceptional fatigue-resistant design and surface hardening push engine overhaul cycles to their limits, significantly reducing annualized maintenance costs.
· Higher Vessel Availability: Extremely low risk of unexpected failure ensures vessels operate on schedule, avoiding demurrage and contract penalties caused by propulsion breakdowns.
· Lower Procurement Costs: Compared to OEM parts, we offer competitive pricing while maintaining equal or superior quality, helping shipowners optimize spare parts budgets.
· Fast Supply Assurance: The company maintains regular stock and can ship quickly via global logistics networks, minimizing customer waiting times.
Availability and Technical Support
The YANMAR 6AY crankshaft is now accepting global orders. We provide a complete technical documentation package, including material certificates, heat treatment reports, dimensional inspection records, and NDT reports. Additionally, our engineering team is available to provide installation guidance and technical consultation to ensure smooth product commissioning.
About Zhejiang Weilin Mechanical Co., Ltd.
Zhejiang Weilin Mechanical Co., Ltd. is a National High-Tech Enterprise specializing in the R&D, manufacturing, and sales of high-performance forged steel crankshafts. Our products are widely used in construction machinery, heavy-duty trucks, generator sets, and marine propulsion. Committed to providing reliable and efficient core powertrain solutions to global customers through excellent materials science, precision manufacturing processes, and a complete quality traceability system.