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Library› Engine Room› Main Engines (2-Stroke)› Main Engine 2-Stroke› MAN Energy Solutions 5S50MC-C8
MAN Energy Solutions

5S50MC-C8

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 5S50MC-C8 is a low‑speed, five‑cylinder two‑stroke main propulsion engine delivering 18 650 kW at 127 rpm, noted for its camshaft‑controlled fuel injection and constant‑pressure turbocharging.

Inspection

Inspector Detail ✓ verified

Designation decoded

5 Zylinder, S=Super-Long-Stroke, 50=Bohrung 500 mm, MC=mechanisch (Nockenwelle), C=Compact, 8=Mark 8.

Background

5-Zylinder MC-C mit 500 mm Bohrung und 2.000 mm Hub. Mechanische Vorgängerversion des S50ME-C. Standardmotor für Handysize-Bulker und Produkttanker der 1990er-2000er Jahre. Große Bestandsflotte.

Calculated metrics

Stroke to bore ratio4

Inspector checklist

Laufzeug & Tribologie
  • Zylinderlaufbuchsen: Hub-Bohrungs-Verhältnis 4.0, Scavenge-Port-Inspektion alle 4.000 h
  • Kolbenringe: Stoßspiele
  • Kreuzkopf: Temperatur, Lagerspiele
Nockenwellen-Steuerung
  • Nockenwelle: Nockenprofile, Verschleiß — bei hohen Betriebsstunden kritisch
  • Kraftstoffpumpen: Plunger, VIT
  • Auslassventil: Mechanisch, Stößel, Puffer
  • Nockenkasten: Öl, Rollenhebel
Brennstoffsystem
  • Einspritzventile: Düsen, Öffnungsdruck
  • Purifier, Catfines
  • Brennstoff-Vorwärmung
Dichtungssysteme
  • Stopfbuchsen: Drainage
  • Auslassventil: Ventilsitz, Rotocap
  • Spülluftkasten: Drainage
Turbolader
  • Reinigung, Vibration
  • Ladeluftkühler
  • Auxiliary Blower

Logbook reference values

ParameterExpectedDeviation means
Abgastemperatur nach Zylinder350-420 °C bei MCR>20 °C Spread
PmaxGemäß Shop-Test ±3 barSpread >5 bar
Spülluftdruck2.5-3.2 bar absZu niedrig
Zylinderöl-Feed-Rate0.8-1.2 g/kWhAn BN anpassen

Common Failure Modes

  • Nockenwellen-Verschleiß

    Symptoms: Timing-Drift

    Causes: Langzeitbetrieb, Schmierung

    Preventive: Nockenprofile bei Docking.

  • Liner-Verschleiß bei hohen Stunden

    Symptoms: Ölverbrauch, Leckgas

    Causes: VLSFO ohne BN-Anpassung, Langzeitbetrieb

    Preventive: Ultraschall bei Docking.

  • Kraftstoffpumpen-Verschleiß

    Symptoms: Spreizung, Leistung

    Causes: Catfines

    Preventive: Brennstoff-Qualität.

Expert tips

  • S50MC-C8 hat riesige Bestandsflotte — Erfahrungswerte und Service Letters reichlich vorhanden
  • MC-C → ME-C Retrofit: Bei diesem Motortyp besonders wirtschaftlich wegen hoher Stückzahl
  • Bei hohen Betriebsstunden (>60.000 h): Komplettüberholung mit Liner-, Nocken- und Pumpenwechsel planen

Related components

  • Nockenwelle
  • Kraftstoffpumpen (VIT)
  • Turbolader
  • Zylinderschmierung
  • Scavenge Air Cooler

Classification & regulatory

IMO Tier I/II. EEXI ggf. EPL oder ME-Retrofit.

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

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