UEC52LA
The UEC52LA is a medium‑bore (520 mm) two‑stroke low‑speed main engine from Japan Engine Corporation, offering mechanical injection and multi‑fuel capability for merchant vessels.
Engine Specifications
Inspector Detail
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Designation decoded
UEC for Mitsubishi/J-ENG, 52 for 520 mm bore, LA for Long Stroke A-Type — older mechanically controlled generation.
Background
The UEC52LA is the mechanically controlled 520 mm variant from J-ENG/Mitsubishi. The LA generation with camshaft control was used from the 1990s onward on medium-sized Japanese merchant ships. Predecessor of the UEC52LSE and UEC52LSH-Eco.
Calculated metrics
Inspector checklist
- Cylinder liner: 520 mm bore — UEC-specific size, wear measurement
- Piston rings: older generation
- Crosshead bearing: bearing clearance
- Camshaft: injection and exhaust valve — cam wear
- Fuel pumps: plunger/barrel
- Valve clearance: manual measurement
- Injection nozzles: condition
- Fuel separation
- Stuffing box: drainage
- Exhaust valve: mechanical — seat and rotation
- Turbocharger: 1× — no redundancy
- Scavenge air cooler
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Exhaust gas temperature after cylinder | 340-420 °C at 85% MCR | Spread >20 °C → injection problem |
| Scavenge Air Pressure | 2.0-2.8 bar abs at MCR | Turbocharger |
| Valve clearance | Per UEC manual | Timing |
Common Failure Modes
Expert tips
- 💡 UEC52LA: 520 mm bore is J-ENG-specific — spare parts only via J-ENG network
- 💡 Older engines on older ships: assess remaining service life at class renewal
Related components
Classification & regulatory
IMO Tier I/II. EEXI: EPL on mechanical engines.
Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.
Components & Design
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Technical Data
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Common failures & inspection points
Service & Maintenance
Follow Mitsubishi UE PMS. Mechanical injection and exhaust valve systems require regular adjustment and inspection.
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