⚓ Working on this equipment?
Ask the AI troubleshooter, log your hours on board and turn them into invoice-ready service reports — for this exact model.
Start free — 14 days →
No credit card required
🔧 30 verified suppliers & service companies for Mitsubishi in the Maritime Network
Find suppliers →
Mitsubishi
5UEC33LSE
The Mitsubishi 5UEC33LSE is a 5‑cylinder, low‑speed two‑stroke marine diesel engine delivering up to 3 100 kW at 200 rpm, designed for bulk carriers and tankers with IMO Tier II emissions compliance.
3100.0 kW
Power
Engine Specifications
5
Cylinders
330 mm
Bore
1050 mm
Stroke
3,100 kW
MCR Power
200.0 rpm
MCR RPM
2-stroke
Stroke Type
Family: Mitsubishi UEC (LS/LA/LSE/LSII)
· Tier: IMO Tier II
· Fuel: HFO, MDO
Inspector Detail
✓ verified
▸
Designation decoded
5 = Zylinderanzahl (5 Zylinder); UEC = Unified Exhaust-port Crosshead (Mitsubishi/J-ENG Zweitakt-Kreuzkopfmotor-Baureihe); 33 = Zylinderbohrung in cm (330 mm); LSE = Long Stroke Eco (langhuber, ökonomisch optimierte Variante mit verbessertem Kraftstoffverbrauch)
Background
The 5UEC33LSE is a compact two-stroke crosshead engine from the UEC series, originally developed by Mitsubishi Heavy Industries and produced since 2018 by J-ENG (joint venture of JMU and MHI). With a 330 mm bore, it ranks among the smallest UEC engines and is typically used for smaller bulk carriers, coastal vessels and general cargo ships. The LSE variant offers improved fuel efficiency and optimized emission values compared to the standard LS version.
Calculated metrics
Stroke To Bore Ratio
3.182
Inspector checklist
Camshaft and control drive
- Camshaft chain drive to be inspected for wear, chain elongation and chain tensioner
- Cam profiles to be inspected for pitting and surface damage
- Camshaft bearing clearance and lubrication to be checked
- Steuerzeiten mit Referenzwerten abgleichen
Fuel injection pumps and fuel system
- Fuel injection pump plungers and barrels to be inspected for wear
- Fuel injection nozzles to be tested for spray pattern and opening pressure
- Brennstoff-Lecköl-Menge pro Zylinder dokumentieren
- Hochdruck-Brennstoffleitungen auf Ermüdungsrisse inspizieren
Exhaust valve and exhaust system
- Exhaust valve stem and seat to be inspected for corrosion and burning
- Ventildrehvorrichtung auf Funktion testen
- Valve guide to be measured for wear and clearance
- Valve lift and closing behaviour to be checked
Crosshead and piston system
- Crosshead bearing clearance to be measured and documented
- Crosshead guide shoe to be inspected for wear and contact pattern
- Piston rod to be checked for ovality and surface damage
- Stuffing box to be inspected for leakage and lamella condition
Zylinderzustand
- Cylinder liner bore diameter to be measured (wear and ovality)
- Measure piston rings and piston ring grooves
- Spülschlitze auf Verkokung inspizieren
- Cylinder lubrication dosage and distribution to be verified
Torsional vibration and vibration damper
- Torsional vibration damper (viscous damper) silicon oil condition and temperature
- Vibration behaviour in 5-cylinder configuration to be particularly noted
- Crankshaft deflection to be measured and documented
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Pmax (Zünddruck) | Gemäß Testbed-Protokoll, Zylinderabweichung < 3 bar | Deviation indicates fuel injection pump timing, nozzle wear or compression loss |
| Exhaust gas temperature per cylinder | Gemäß Herstellerangabe, Spreizung < 30°C | Elevated temperature indicates poor combustion or exhaust valve leakage |
| Pcomp (Kompressionsdruck) | Gemäß Shop-Test, Abweichung < 2 bar | Low value indicates piston ring, exhaust valve, or liner wear |
| Zylinderschmieröl-Feedrate | 0.8–1.3 g/kWh depending on sulphur content | Zu niedrig: Laufbuchsenverschleiß; zu hoch: Ölkohlebildung |
| Kühlwassertemperatur Zylinderauslass | 75–85°C | Deviations indicate cooling water control valve problems or liner burnthrough |
| Kurbelwellen-Durchbiegung | Gemäß Hersteller-Limits (typisch ±0.05 mm) | Exceedance indicates main bearing wear or foundation deformation |
Common Failure Modes
Torsionsschwingungsprobleme (5-Zylinder)
Symptoms: Ungewöhnliche Vibrationen, Rissbildung an Kurbelwangen, erhöhte Schwingungsdämpfer-Temperatur
Causes: Inherent vibration excitation at 5-cylinder arrangement, Defective or age-related ineffective vibration damper, Betrieb in verbotenen Drehzahlbereichen (Barred Speed Range)
Preventive: Vibration damper to be inspected regularly and silicone oil changed at manufacturer interval, barred speed range strictly observed
Fuel injection pump wear
Symptoms: Ungleichmäßiger Motorbetrieb, erhöhter Kraftstoffverbrauch, schwarzer Rauch, Abgastemperatur-Spreizung
Causes: Abrasive wear due to fuel contamination, Cavitation on plunger and bushing, Unzureichende Brennstoff-Filtration
Preventive: Optimize fuel treatment and filtration, overhaul fuel injection pumps at service interval
Auslassventil-Abbrand
Symptoms: Erhöhte Abgastemperatur, Kompressionsverlust, sichtbarer Blow-by
Causes: Hot corrosion due to vanadium and sodium in fuel, Mangelnde Ventilrotation, Seat wear due to insufficient lapping
Preventive: Ventilsitz regelmäßig nachschleifen, Ventildrehvorrichtung prüfen, Brennstoffqualität kontrollieren
Stopfbuchsen-Leckage
Symptoms: Ölverlust im Kurbelraum, erhöhter Schmierölverbrauch, Ölnebel im Spülluftkanal
Causes: Kolbenstangen-Oberflächenschaden, Wear of stuffing box lamellae, Unzureichende Federvorspannung
Preventive: Inspect piston rod surface during piston pull, replace lamellae at manufacturer interval
Expert tips
- 💡 For 5-cylinder engines, pay particular attention to torsional vibration damper and barred speed range compliance — 5-cylinder configurations are more susceptible to torsional vibrations.
- 💡 Observe Mitsubishi-specific spare parts supply since J-ENG takeover (2018) — obtain spare parts via J-ENG network and verify compatibility with older UEC versions.
- 💡 Camshaft chain drive is a main inspection point which does not exist on MAN ME/ME-C — document chain elongation and sprocket wear at manufacturer interval.
Related components
Turbolader
Ladeluftkühler
Crosshead bearing and guide
Main bearing and crankshaft
Pleuellager
Camshaft and chain drive
Einspritzpumpen
Torsionsschwingungsdämpfer
Brennstoffaufbereitung (Filter, Separator)
Anlassluftsystem
Classification & regulatory
Comply with IACS UR Z10 class survey requirements. Check NOx Technical File and EIAPP certificate. For 5-cylinder engines, verify torsional vibration analysis in class certificate. Barred speed range must be clearly documented on the bridge and in the engine room.
Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.
Other Cylinder Configurations 44
5UEC37LA
5 cyl
· 4,250 kW
5UEC43LSE
5 cyl
· 6,000 kW
5UEC45LA
5 cyl
· 7,000 kW
5UEC50LSE
5 cyl
· 9,250 kW
5UEC50LSII
5 cyl
· 9,500 kW
5UEC52LA
5 cyl
· 10,250 kW
5UEC60LS
5 cyl
· 14,500 kW
5UEC60LSII
5 cyl
· 15,250 kW
5UEC68LSE
5 cyl
· 19,500 kW
5UEC68LSII
5 cyl
· 20,250 kW
5UEC85LSII
5 cyl
· 29,000 kW
6UEC33LSE
6 cyl
· 2,100 kW
6UEC37LA
6 cyl
· 5,100 kW
6UEC43LSE
6 cyl
· 7,200 kW
6UEC45LA
6 cyl
· 5,610 kW
6UEC50LSE
6 cyl
· 7,320 kW
6UEC50LSII
6 cyl
· 11,400 kW
6UEC52LA
6 cyl
· 12,300 kW
6UEC60LS
6 cyl
· 17,400 kW
6UEC60LSII
6 cyl
· 18,300 kW
6UEC68LSE
6 cyl
· 23,400 kW
6UEC68LSII
6 cyl
· 24,300 kW
6UEC85LSII
6 cyl
· 22,680 kW
7UEC33LSE
7 cyl
· 4,340 kW
7UEC37LA
7 cyl
· 5,950 kW
7UEC43LSE
7 cyl
· 8,400 kW
7UEC45LA
7 cyl
· 9,800 kW
7UEC50LSE
7 cyl
· 12,950 kW
7UEC50LSII
7 cyl
· 13,300 kW
7UEC52LA
7 cyl
· 14,350 kW
7UEC60LS
7 cyl
· 14,420 kW
7UEC60LSII
7 cyl
· 21,350 kW
7UEC68LSE
7 cyl
· 27,300 kW
7UEC68LSII
7 cyl
· 28,350 kW
7UEC85LSII
7 cyl
· 40,600 kW
8UEC33LSE
8 cyl
· 4,960 kW
8UEC43LSE
8 cyl
· 9,600 kW
8UEC45LA
8 cyl
· 11,200 kW
8UEC50LSE
8 cyl
· 14,800 kW
8UEC50LSII
8 cyl
· 15,200 kW
8UEC52LA
8 cyl
· 16,400 kW
8UEC60LSII
8 cyl
· 24,400 kW
8UEC68LSII
8 cyl
· 32,400 kW
8UEC85LSII
8 cyl
· 46,400 kW
Components & Design
Component data being added…
Technical Data
Bohrung UEC33LSII
330 mm
Hub UEC33LSII
1050 mm
Hub/Bohr-Verhältnis UEC33LSII
3,18
Bohrung UEC37LSII
370 mm
Hub UEC37LSII
1290 mm
Leistung UEC33LSII (6-Zyl.)
1985–3400 kW @ 215/157 min⁻¹ (verifiziert)
SFOC UEC33LSII
179–183 g/kWh (IMO Tier II, Vollast)
Trockengewicht UEC33LSII
52–78 t (5–8 Zyl.)
Trockengewicht UEC37LSII
83–124 t (configuration not verifiable)
Betriebsmodus
Zweitakt-Kreuzkopfmotor, Gleichstromspülung, Abgasturbolader
Steuerung LSII
Nockenwelle (mechanisch betätigt)
Steuerung Eco-Variante
Elektronisch (Solenoidventile, keine Nockenwelle)
Brennstoff
Schweröl (Heavy Fuel Oil)
IMO-Norm
Tier II; Tier III-konform (mit LPSCR)
unified from engine model
True
🤖 Ask about this model
One free question — answered like a marine engineer. No account needed.
Common failures & inspection points
Cold corrosion on cylinder liners due to sulfuric acid condensation at part load — typical for two-stroke diesels; sulfur dioxide from fuel by
Turbocharger wear due to saltwater corrosion — pitting on turbine casing due to seawater feed in exhaust line, pressure drop due to gap enlargement
Piston/cylinder liner wear due to scuffing at insufficient hydrodynamic oil film or poor scavenge air quality — abrasive wear initiat
Black exhaust at part load (turbo-lag phenomenon) — scavenge pressure increases only when turbocharger accelerates; too much fuel → incomplete combustion, r
Zylinderkopf-Wasserdichtung/Kühlung — Risse/undichte Kopfdichtungen ermöglichen Coolant-Eintrag in Kurbelgehäuse (Milchig-braune Ölverfärbung), Korrosion; Restr
Type-general inspection and maintenance points for this equipment category — not model-specific.
Suppliers & Spare Parts
Direct links to manufacturer, datasheet, spare-parts portal and dealers — request access below.
📄 Request sourcing links & documents🛠 Manage this equipment in your fleet
Cases, daily reports, timesheets and AI troubleshooting in the OceanSphere Marine app — free for 14 days.
Start free trial →🔎 Suppliers & service for this equipment
Find manufacturers, repair shops and spare-part dealers in the Maritime Network — our global company directory.
Maritime Network →Working on this unit?
Log hours, photos and findings into an invoice-ready service report — OceanSphere Marine, 14-day free trial.
Need a service partner for Mitsubishi?
114,000+ shipyards, suppliers and service companies in the Maritime Network directory.
Equipment Model #38572
· ✓ still in production