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Japan Engine Corporation

UEC52LSH-Eco

The UEC52LSH‑Eco is a low‑speed two‑stroke main engine from Japan Engine Corporation, distinguished by its 520 mm bore and an Eco‑tuned combustion system that delivers higher fuel efficiency while meeting IMO Tier II/III emissions standards.

Per Hersteller-Datenblatt
Capacity
HFO/MDO/MGO/VLSFO
Medium

Engine Specifications

520 mm
Bore
2-stroke
Stroke Type

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Designation decoded

UEC steht für Unified Engine Company (J-ENG), 52 für 520 mm Bohrung, LSH für Long Stroke H-type (neueste Generation), Eco für Effizienz-Optimierung.

Background

Der UEC52LSH-Eco ist die neueste Generation des UEC 520-mm-Motors für mittelgroße Handelsschiffe. LSH = vollständig elektronische Steuerung. Eco = SFOC-optimiert. Nachfolger der UEC52LSE-Serie.

Calculated metrics

Inspector checklist

Laufzeug & Tribologie
  • Zylinderlaufbuchsen: 520 mm Bohrung. Neueste Generation.
  • Kolbenringe: LSH-Eco-Design.
  • Kreuzkopf-Lager: Standard.
Steuerung & Einspritzung
  • J-ENG LSH-Steuerung.
  • Einspritzung: Eco-optimiert.
  • Auslassventil: Elektronisch.
Brennstoffsystem
  • Eco-Einspritzung.
  • Cat-Fines <10 ppm.
Spülluft & Turbolader
  • Mitsubishi MET-TC.
  • Ladeluftkühler.

Logbook reference values

Parameter Expected Deviation means
Exhaust gas temperature per cylinder 348–405 °C at 75% MCR Spread >20 °C → Einspritzung
Pmax 133–162 bar Zylinderabweichung >5 bar → Diagnose
SFOC 158–168 g/kWh at 75% MCR >5% → Optimierung

Common Failure Modes

Cold Corrosion
Symptoms: liner wear
Causes: Schwefelkondensation
Preventive: BN-angepasst.
Cat-Fines-Schaden
Symptoms: rapid wear
Causes: Separator-Fehlfunktion
Preventive: Cat-Fines <10 ppm.

Expert tips

  • 💡 UEC52LSH-Eco: Neueste J-ENG-Technologie im mittleren Segment. Eco-Optimierung primär für 50–75% MCR ausgelegt.
  • 💡 LSH-Generation competes directly with MAN ME-C and WinGD X-B — note manufacturer-specific differences in fleet comparisons.

Related components

Turbolader (Mitsubishi MET) Brennstoff-Separator J-ENG LSH-Steuerung Kreuzkopf-Lager

Classification & regulatory

IMO Tier II/III. EEDI Phase 2/3.

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

●Cylinder liner cold corrosion
●Exhaust valve burn-through
●Fuel valve nozzle fouling
●Piston ring sticking

Service & Maintenance

Use J-ENG PMS. Cylinder condition, drain-oil analysis and slow-steaming performance trends should guide overhaul planning.

Suppliers & Spare Parts

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Replacement Parts

Keep exhaust valves, piston ring sets, fuel valve parts, fuel pump components, cylinder cover seals and control system spares.
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Equipment Model #36790 · ✓ still in production