Description
Technical Overview & Product Details
The Mitsubishi UEC 45LA series represents a highly reliable and robust class of low-speed, two-stroke crosshead marine diesel engines. Extensively utilized as primary propulsion machinery for handysize bulk carriers, product tankers, and feeder container vessels, these long-stroke engines require massive hydraulic precision from their fuel injection systems.
To achieve maximum thermal efficiency, reduce Specific Fuel Oil Consumption (SFOC), and comply with international IMO Tier marine emission rules, the engine demands perfect calibration from its atomizing tips. The 4M075-4N designation specifies a micro-calibrated, cooled multi-hole nozzle tip array engineered to withstand extreme continuous cyclical thermal stresses and immense hydraulic impact loads typical of low-speed crosshead propulsion machinery.
- Compatible Engine Type: Mitsubishi UEC 45LA, 5UEC45LA, 6UEC45LA, and UEC 45-series two-stroke low-speed main propulsion engines.
- Nozzle Type / Designation: 4M075-4N / 45LA4M075-4N series (Cooled Type).
- Component Type: Fuel Injector Valve Nozzle Tip Element.
- Material: Vacuum-hardened, high-grade alloy tool steel featuring enhanced micro-hardness and hot-strength profiles.
- Fuel Compatibility: Fully optimized for persistent operation with high-viscosity Heavy Fuel Oil (HFO), Marine Diesel Oil (MDO), and Marine Gas Oil (MGO).
Key Features & Performance
- Advanced Cooled Nozzle Design: Engineered with internal cooling channels designed to dissipate intense combustion chamber heat effectively. This active thermal management prevents structural degradation of the tip and eliminates the risk of carbon trumpet formation (coking) around the nozzle orifices when burning low-grade Heavy Fuel Oil (HFO).
- Optimized Spray Geometry: Features precision-drilled spray orifices calibrated to match the exact air swirl and large-bore combustion chamber geometry of the UEC 45LA cylinder unit. This secures an ultra-fine atomization matrix, promoting total thermal efficiency while strictly preventing direct flame impingement on the piston crown or cylinder cover.
- Sharp, Anti-Drip Cutoff: Fabricated with a microscopic needle-to-seat precision fit that guarantees an instantaneous hydraulic cutoff the microsecond the injection stroke terminates. This completely eliminates “after-drip,” directly lowering exhaust gas temperatures (EGT), reducing smoke emissions, and extending the operational lifespan of exhaust valves.
- Superior Resistance to Abrasive Wear: Lower-grade, unrefined marine heavy fuel oils frequently carry highly abrasive catalytic fines (aluminum and silicon oxides). The advanced metallurgical hardening profile of our 4M075-4N tips delivers exceptional resistance against orifice erosion and high-pressure cavitation pitting.
Why Source from Heybeli Marine?
Sub-standard main engine fuel nozzles result in incomplete combustion, accelerated cylinder liner wear, thermal imbalance across units, and localized piston crown burning. Heybeli Marine safeguards your technical management and vessel machinery assets with:
- Strict OEM Interchangeability: Sourced from world-class manufacturers utilizing high-end CNC grinding technologies, our nozzles guarantee exact dimensional fitment and flow-matching with original equipment parameters.
- Global Strategic Logistics: We maintain comprehensive stock allocations of Mitsubishi UEC series fuel injection parts within strategic international supply lines, ensuring rapid dispatch to major dry docks, commercial trading ports, and freight forwarders worldwide.
- Rigorous Quality Assurance: Every single nozzle undergoes extensive flow-rate testing, high-pressure needle-seat sealing checks, and geometric verification before being approved for distribution.
- Complete Overhaul Integration: We supply these high-performance nozzle tips along with all corresponding gas-tight copper sealing washers, pressure pins, and internal springs required for a complete, professional injector rebuild.
Technical Maintenance Note: When overhauling the fuel valves on large two-stroke propulsion engines like the Mitsubishi UEC 45LA, always check the opening pressure (pop pressure) using a certified manual injector test bench to comply with the engine’s technical instruction manual. Inspect the nozzle cooling circuit connections for any blockages, scale, or carbon deposits, and always implement brand-new sealing gaskets to guarantee gas-tight structural compression against the cylinder cover.