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MAN Energy Solutions

5S50ME-C9.6

Main Engine 2-Stroke · Main Engines (2-Stroke)

Technical data from manufacturer or class sources · not yet verified by a person
18,650 kWPower
5Cylinders
500 mmBore
2,000 mmStroke
127 rpmMCR RPM

The MAN 5S50ME-C9.6 is a low‑speed, five‑cylinder, two‑stroke main propulsion engine delivering 18 650 kW at 127 rpm, notable for its hydraulic power‑supply (HPS) and per‑cylinder Hydraulic Cylinder Units that replace the traditional camshaft.

Inspection

Inspector Detail

Designation decoded

5 = Zylinderzahl, S = Super Long Stroke, 50 = Bohrung 500 mm, ME-C = MAN Electronically controlled Mark C, 9.6 = Mark 9.6 Steuerungsgeneration.

Background

Die S50ME-C ist die Super-Long-Stroke-Variante der 50er-Plattform. Kuerzerer Hub (2000 vs. 2300mm G50), hoehere Drehzahl. Kompakter Bau fuer Handysize-Bulker und kleine Tanker. Eine der am haeufigsten gebauten ME-C-Varianten.

Calculated metrics

Stroke to bore ratio4

Inspector checklist

Kraftstoffsystem
  • Kraftstoffpumpen: Plunger, Duesen
  • Vorwaermung: 12-15 cSt
  • Cat-Fines: <15 ppm
  • VLSFO-Kompatibilitaet
Laufzeug und Tribologie
  • Laufbuchsen 500mm: Wear, BN
  • Kolbenringe: Gap, Laufflaeche
  • Kreuzkopf: S/B=4.0, moderate Belastung
  • Stopfbuchse: Drainage
ME-Steuerung
  • HPS 300 bar
  • FIVA Mark 9.6
  • CCU
Turbolader
  • Lagerspiel, Reinigung
  • Spuelluftdruck

Logbook reference values

ParameterExpectedDeviation means
Abgastemperatur320-420 Grad C>25 Grad C Spread
Spuelluftdruck1.8-3.2 barTC-Fouling
Zylindeloelverbrauch0.7-1.2 g/kWhBN anpassen
OMD<2.5% LELStopfbuchse

Common Failure Modes

  • Cat-Fine-Schaeden

    Symptoms: Liner-Wear

    Causes: Separator, VLSFO

    Preventive: <15 ppm.

  • Cold Corrosion

    Symptoms: Hoher Wear

    Causes: BN, Teillast

    Preventive: BN anpassen.

  • FIVA-Fehlfunktion

    Symptoms: Timing, Pmax-Spread

    Causes: Oel

    Preventive: HPS-Oel.

Expert tips

  • S50ME-C ist ein Arbeitspferd — riesige installierte Basis, sehr gute Erfahrungsdaten und Ersatzteilversorgung.
  • S-Variante: Kompakterer Motor, einfacherer Kreuzkopf-Zugang, moderate Seitenkraefte (S/B=4.0).
  • Bei 5 Zylindern: Vibrationsanalyse bei Slow Steaming nicht vergessen.

Related components

  • Turbolader
  • Spuelluftkuehler
  • Separatoren
  • Alpha Lubricator
  • HPS

Classification & regulatory

IMO Tier II. ECA: VLSFO/Scrubber.

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

Documentation

Manuals

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