UEC50LSE
The UEC50LSE is a medium‑speed, two‑stroke marine diesel engine from Japan Engine Corporation, notable for its flexible fuel capability and proven family design.
Engine Specifications
Inspector Detail
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Designation decoded
UEC steht für Unified Engine Company (Mitsubishi/J-ENG), 50 für 500 mm Bohrung, LSE für Long Stroke Enhanced.
Background
The UEC50LSE is a medium 2-stroke engine for Handymax bulk carriers and product tankers. 500 mm bore — direct competitor to MAN S50ME-C and comparable with WinGD X52. Mainly installed on Japanese and Korean-built vessels.
Calculated metrics
Inspector checklist
- Zylinderlaufbuchsen: 500 mm Bohrung. Standard-Verschleißmessung.
- Kolbenringe: UEC-Design.
- Crosshead bearing: deflection and temperature.
- J-ENG-Steuerung: Elektronisch (LSE).
- Einspritzventile: Düsen, Öffnungsdruck.
- Auslassventil.
- Düsen.
- Cat-Fines: <10 ppm.
- VLSFO-Handling.
- Mitsubishi MET-TC (1–2 TC).
- Ladeluftkühler.
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Exhaust gas temperature per cylinder | 355–410 °C at 75% MCR | Spread >20 °C → Einspritzung/Kompression |
| Pmax | 130–158 bar | Zylinderabweichung >5 bar → Diagnose |
| SFOC | 163–173 g/kWh at 75% MCR | >5% → Optimierung |
Common Failure Modes
Expert tips
- 💡 UEC50LSE vs MAN S50ME-C vs WinGD X52: Three manufacturers for the same bore class. Spare parts, service procedures and control systems are NOT interchangeable.
- 💡 UEC engines on non-Japanese vessels: J-ENG service network is strong in Asia, weaker in Europe/America — clarify service availability at inspection.
Related components
Classification & regulatory
IMO Tier II. Tier III mit SCR.
Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Service & Maintenance
Follow UE engine PMS. Cylinder condition should be checked by scavenge inspection and drain-oil trend; combustion parts overhauled by condition and maker intervals.
Suppliers & Spare Parts
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