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Mitsubishi

8UEC43LSE

Name: Mitsubishi 8UEC43LSE
Brand: Mitsubishi
SKU: OSE-38609

The Mitsubishi 8UEC43LSE is an 8‑cylinder, low‑speed 2‑stroke diesel main engine delivering up to 9 600 kW at 155 rpm, designed for large commercial vessels with IMO Tier II emissions compliance.

9600.0 kW

Power

Engine Specifications

Cylinders

430 mm

Bore

1350 mm

Stroke

9,600 kW

MCR Power

155.0 rpm

MCR RPM

2-stroke

Stroke Type

Family: Mitsubishi UEC (LS/LA/LSE/LSII) · Tier: IMO Tier II · Fuel: HFO, MDO

Inspector Detail ✓ verified

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Designation decoded

8UEC43LSE – Mitsubishi 8-Zylinder, Unified Exhaust-valve Crosshead, 430 mm Bohrung, LSE-Baureihe. Kompakter Zweitakt-Kreuzkopfmotor mit Nockenwellensteuerung. 8-Zylinder-Konfiguration mit optimalem Schwingungsverhalten. Bordwartung vollständig möglich.

Background

The UEC43LSE belongs to the medium compact bore class of the Mitsubishi UEC family. With 430 mm bore and 1350 mm stroke, it is designed for medium-sized cargo ships, product tankers and multipurpose cargo vessels. The 8-cylinder version offers the best vibration characteristics in the UEC series. All maintenance work including piston removal can be performed onboard, which increases availability. The LSE variant offers improved fuel efficiency and emission values compared to the basic LS series. The engine is camshaft-driven and follows the proven UEC design principle.

Calculated metrics

Stroke To Bore Ratio

3.14

Mean Effective Pressure Bar

20.0

Inspector checklist

Crankshaft and running gear

Measure crankshaft deflection and compare with manufacturer limits
Inspect main bearings and connecting rod bearings – use oil analysis
Drucklager-Axialspiel kontrollieren
Ölnebelüberwachung (OMD) auf Funktion testen

Cylinder, piston and liner

Laufbuchsenverschleiß in mehreren Ebenen dokumentieren
Check piston ring condition, end gap and axial mobility
Inspect piston crown for cracks and thermal damage
Monitor cylinder oil dosage and lubrication quills

Camshaft and fuel system

Nockenoberflächen visuell inspizieren
Einspritzpumpen-Timing überprüfen
Test injection nozzles for spray pattern and opening pressure
Evaluate fuel preparation and filtration

Exhaust valves and charging

Check exhaust valve spindle and seat for corrosion
Ventildrehvorrichtung testen
Document turbocharger condition and speed
Ladeluftkühlerwirkungsgrad bestimmen

Crosshead and guide

Kreuzkopflagerspiel messen
Führungsschuhspiel kontrollieren
Kolbenkühlung-Teleskoprohre auf Dichtheit prüfen
Schubstangenschrauben auf Dehnung kontrollieren

Logbook reference values

Parameter	Expected	Deviation means
Maximaler Zünddruck (Pmax)	148–165 bar	Deviation between cylinders >5 bar requires root cause analysis – injection, compression or valve timing
Kompressionsdruck (Pcomp)	120–140 bar	Low Pcomp indicates piston ring or valve wear
Exhaust gas temperature per cylinder	310–380 °C	Bei 8 Zylindern sollte die Streuung unter 25 °C bleiben – größere Abweichungen untersuchen
Zylinderölverbrauch	0,8–1,2 g/kWh	Adjust dosage rate to fuel sulphur content and cylinder liner condition
Spülluftdruck	2,3–3,0 bar (Volllast)	Pressure drop indicates turbocharger or charge air cooler problem
Kurbelwellendurchbiegung	±0,04 mm	Exceeding can indicate bearing wear or foundation problem
Kühlwasseraustrittstemperatur	78–85 °C	Elevated temperature of individual cylinders indicates cooling water deposits or cylinder liner damage

Common Failure Modes

Kolbenringverkokung

Symptoms: ['Erhöhter Blow-by in den Spülluftkasten', 'Zunehmender Zylinderölverbrauch', 'Nachlassende Kompression']

Causes: Ungeeignete Zylinderölsorte für aktuellen Brennstoff, Überdosierung von Zylinderöl, Schlechte Brennstoffqualität mit hohem Asphaltengehalt

Preventive: Adjust cylinder oil type and rate to fuel quality, perform regular scavenge air box inspection, check piston rings at every piston removal and measure end gap

Einspritzpumpen-Plungerverschleiß

Symptoms: ['Nachlassender Einspritzdruck', 'Ungleichmäßiger Motorbetrieb', 'Erhöhter Brennstoffverbrauch']

Causes: Abrasive wear due to fuel contamination, Kavitation im Pumpenarbeitsraum, Überschreitung der Betriebsstundenintervalle

Preventive: Optimize fuel treatment, overhaul injection pumps at manufacturer intervals, monitor separator performance regularly

Auslassventilundichtheit

Symptoms: ['Kompressionsverlust', 'Erhöhte Abgastemperatur am betroffenen Zylinder', 'Sichtbare Blow-by-Spuren am Ventilgehäuse']

Causes: Corrosion due to vanadium and sodium in fuel, Ventildrehung gestört (Rotocap defekt), Ablagerungen auf der Sitzfläche

Preventive: Verify valve rotation at each inspection, re-grind valve seats per manufacturer specification, monitor fuel quality

Nockenwellenschmierungsproblem

Symptoms: ['Erhöhte Nockenflächentemperatur', 'Pitting an Nockenoberflächen', 'Verschleißpartikel im Schmieröl']

Causes: Schmierölverschmutzung, Unzureichender Schmieröldruck, Falsche Schmierölviskosität

Preventive: Schmierölanalyse regelmäßig durchführen, Schmierölfilter überwachen, Ölwechselintervalle einhalten

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Related components

Fuel injection pumps and nozzle assemblies Turbolader Ladeluftkühler Zylinderöl-Dosiersystem Auslassventil-Hydrauliksystem Camshaft drive and control gearing Kreuzkopf-Schmierölversorgung Ölnebelüberwachung (OMD) Fuel separator and filter

Classification & regulatory

IMO Tier II emission limit values must be observed. EIAPP certificate and Technical File must be available onboard. When sailing in Emission Control Areas (ECA), additional SOx limit values apply, which may require fuel changeover or exhaust gas aftertreatment. The 8-cylinder configuration can enable more favourable vibration conditions; however, compliance with barred speed ranges per vibration report is mandatory.

Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.