7UEC45LA
The Mitsubishi 7UEC45LA is a medium‑speed, two‑stroke diesel main engine delivering up to 9 800 kW at 150 rpm, designed for bulk carriers and tankers with a focus on high power density and IMO Tier II emissions compliance.
Engine Specifications
Inspector Detail
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Designation decoded
Mitsubishi 7UEC45LA – 7-Zylinder, 450 mm Bohrung, 1350 mm Hub, Zweitakt-Kreuzkopfmotor, LA-Baureihe (Low-speed Type A), nockenwellengesteuert
Background
The UEC45LA belongs to the LA series of the Mitsubishi UEC engine family and is a proven two-stroke crosshead marine diesel engine for small to medium-sized cargo ships. The LA variant was one of the earlier further developments with improved power density. With 7 cylinders, the engine is subject to typical torsional vibration risks, which can be particularly pronounced with uneven cylinder numbers. The slightly larger bore compared to the 43 offers higher power potential with the same stroke.
Calculated metrics
Inspector checklist
- Check torsional vibration damper for silicone oil leakage and temperature development
- Kurbelwellendurchbiegung an allen Lagerstellen messen
- 7-Zylinder-spezifische Schwingungsproblematik beachten
- Barred Speed Range-Dokumentation auf Aktualität prüfen
- Measure liner wear and ovality
- Check piston rings for end gap and wear profile
- Control scavenge ports for coking and blockage
- Inspect cylinder head valve seats and exhaust valves
- Measure camshaft drive chain for elongation and wear
- Check fuel injection pumps for delivery rate and timing
- Fuel injectors – check opening pressure and spray pattern
- Kraftstoff-Hochdruckleitungen auf Materialermüdung prüfen
- Check crosshead bearing clearance and oil supply
- Pleuelstangenschrauben auf korrekte Vorspannung prüfen
- Control piston rod stuffing box and scraper rings
- Examine guide bars for wear pattern and scoring
- Piston cooling oil – flow rate and outlet temperature
- Hauptlager-Schmierölversorgungsdruck kontrollieren
- Check cooling water quality and inhibitor concentration
- Monitor cylinder oil dosage and quality
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Maximaler Zünddruck (Pmax) | 125–150 bar (lastabhängig) | Elevated values indicate excessively early injection timing, low values point to compression losses or nozzle wear |
| Exhaust gas temperature per cylinder | 330–410 °C at rated load | Increased spread >30 °C between cylinders requires power balancing; single-cylinder rise indicates nozzle or valve problems |
| Spülluftdruck im Receiver | 1,3–2,2 bar (lastabhängig) | Low values signal turbocharger fouling or charge air cooler blockage |
| Kühlwasser-Austrittstemperatur | 78–88 °C | Deviations indicate thermostat fault, scale deposits or flow disruptions |
| Kolbenkühlöl-Temperatur (Austritt) | 45–55 °C | Rise indicates piston crown overheating or reduced cooling oil quantity |
| Schmieröldruck vor Motor | 2,5–4,0 bar | Pressure drop may point to filter fouling, pump wear or bearing damage |
| Kompressionsdrücke | 90–120 bar (lastabhängig) | Low compression indicates piston ring wear, valve leakage or liner wear |
Common Failure Modes
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Related components
Classification & regulatory
According to IACS UR M68, barred speed range provisions must be documented and observed. Torsional vibration damper overhaul according to classification requirements. Crankshaft deflection to be submitted at intermediate and renewal surveys. NOx Technical File and EIAPP certificate according to MARPOL Annex VI must be current. When replacing cylinder components, conformity with the NOx Technical File must be ensured.
Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.
Other Cylinder Configurations 44
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Borescope inspection of exhaust valve seats for scratches/wear, dye penetrant test for cracks, leakage measurements (valve should hold pressure under compressed air for 15 min)
Liner surface inspection for scratches/grooves, piston run gemietlich measurement, lubricant flow rate check (wrong parameters for part load operation)
Measure pressure drop across cooler, check air temperature after cooler, inspect drainage separator for water accumulation
Tägliche Kurbelgehäuse-Ölprobe auf Weißmetall-Partikel (>0.5 mm mit glatter Oberfläche beidseitig = Überbelastung), Lagerspiel-Kontrolle per Schieblehre
Check crankshaft bearing flanges with magnifying glass for cracks; crankshaft deflection measurement via dial gauge (indicator set: <0.1 mm critical)
Type-general inspection and maintenance points for this equipment category — not model-specific.
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