"> Japan Engine Corporation UEC37LSII
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Japan Engine Corporation

UEC37LSII

The UEC37LSII is a low‑speed, two‑stroke marine diesel main engine with a 370 mm bore, designed for large commercial vessels and capable of running on HFO, MDO, MGO or VLSFO.

Japan Engine Corporation UEC37LSII
Per Hersteller-Datenblatt
Capacity
HFO/MDO/MGO/VLSFO
Medium

Engine Specifications

370 mm
Bore
2-stroke
Stroke Type

Inspector Detail

▸

Designation decoded

UEC stands for Unified Engine Company (Mitsubishi/J-ENG), 37 for 370 mm bore, LS for long stroke, II for generation 2.

Background

The UEC37LSII is a small 2-stroke engine for small merchant vessels. 370 mm bore — UEC-specific (no MAN/WinGD equivalent in this exact size). LS generation II with electronic control.

Calculated metrics

Inspector checklist

Running Gear & Tribology
  • Cylinder liners: 370 mm bore. Small liner, high specific load.
  • Piston rings: UEC design.
  • Crosshead bearings: Tight dimensioning on a small engine.
Control & Injection
  • J-ENG control system: Electronically controlled injection.
  • Injection valves: Nozzle condition.
  • Exhaust valve.
Fuel System
  • Injection: Nozzles, opening pressure.
  • Cat fines: <10 ppm.
Scavenge Air & Turbocharger
  • Turbocharger: Mitsubishi MET. Single TC.
  • Charge air cooler.

Logbook reference values

Parameter Expected Deviation means
Exhaust gas temperature after cylinder 375-435 degrees C at 75% MCR Spread >30 degrees C -> injection
Pmax 112-138 bar Cylinder deviation >5 bar -> diagnostics

Common Failure Modes

Cat fines damage
Symptoms: Rapid wear
Causes: Small bore = high sensitivity
Preventive: Cat fines <10 ppm.
TC failure
Symptoms: Total loss of charge air
Causes: Bearing damage
Preventive: MET TC overhaul.

Expert tips

  • 💡 UEC37LSII: UEC-specific bore with no MAN/WinGD equivalent — spare parts only through J-ENG/Mitsubishi.
  • 💡 Japanese shipping practice: UEC engines are often maintained with the utmost care — documentation is typically excellent.

Related components

Turbocharger (Mitsubishi MET) Fuel separator J-ENG control system Crosshead bearings

Classification & regulatory

IMO Tier II. Tier III with 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

●Fuel pump plunger wear
●Exhaust valve seat leakage
●Cylinder liner wear
●Turbocharger fouling

Service & Maintenance

Follow UE engine PMS. Fuel injection equipment and exhaust valves require scheduled checks; cylinder condition is scavenge-inspection based.

Suppliers & Spare Parts

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Replacement Parts

Maintain fuel pump elements, fuel valves, exhaust valve parts, piston rings and gasket kits.
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Equipment Model #36781 · discontinued