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MAN Energy Solutions

5G90ME-C9.6

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

Technical data from manufacturer or class sources · not yet verified by a person
56,000 kWPower
5Cylinders
900 mmBore
3,720 mmStroke
76 rpmMCR RPM

The MAN 5G90ME-C9.6 is a low‑speed, five‑cylinder, two‑stroke main engine delivering up to 56 MW at 76 rpm, featuring hydraulic valve actuation and advanced electronic control for high efficiency and Tier III emissions compliance.

Inspection

Inspector Detail

Designation decoded

5 = Zylinderzahl, G = Green Ultra Long Stroke, 90 = Bohrung 900 mm, ME-C = MAN Electronically controlled Mark C, 9.6 = Mark 9.6 Steuerungsgeneration.

Background

Die G90ME-C mit 900mm Bohrung und 3720mm Hub (S/B=4.13) ist einer der groessten Schiffsmotoren der Welt. 5 Zylinder bei 900mm ist die absolute Minimalkonfiguration fuer diese Groesse — extrem selten. Typischerweise 6-14 Zylinder bei dieser Bohrung.

Calculated metrics

Stroke to bore ratio4.13

Inspector checklist

Kraftstoffsystem
  • Kraftstoffpumpen: 900mm-Brennraum, Spray-Penetration
  • Cat-Fines: <15 ppm, maximales Schadenspotenzial
  • VLSFO
Laufzeug und Tribologie
  • Laufbuchsen 900mm: Extremer Durchmesser, Wear, BN, Rundheit
  • Kolbenringe: 900mm thermische Variation
  • Kreuzkopf: 3720mm Hub, S/B=4.13, extreme Belastung, LI
  • Stopfbuchse: Laengste Kolbenstange
Strukturelle Integritaet
  • Motorblock: 900mm Kraefte, Ankerschrauben ultraschallgeprueft
  • Kurbelwelle: Deflection, 5 Kroepfungen
  • Fundament: Thermische Zyklen
ME-Steuerung
  • HPS: Maximale Volumenstroeme
  • FIVA Mark 9.6
  • CCU

Logbook reference values

ParameterExpectedDeviation means
Abgastemperatur320-420 Grad C>25 Grad C Spread
Spuelluftdruck2.8-4.0 barTC
Zylindeloelverbrauch0.7-1.2 g/kWhBN
OMD<2.5% LELStopfbuchse
DeflectionMAN-ToleranzFluchtung

Common Failure Modes

  • Cat-Fine-Schaeden

    Symptoms: Liner-Wear bei 900mm — maximales Schadenspotenzial

    Causes: Separator

    Preventive: <15 ppm, strenge Aufbereitung.

  • Kreuzkopf-Schaden

    Symptoms: Klopfen, LI, Temperatur

    Causes: 3720mm Hub

    Preventive: LI alle 8000 Bh.

  • Fundament-Verformung

    Symptoms: Deflection

    Causes: Thermisch, Beladung

    Preventive: Deflection bei Docking.

Expert tips

  • 5 Zylinder bei G90: Absolut seltene Konfiguration — Torsionsschwingungen sind das Hauptrisiko. Barred Speed Range strikt einhalten.
  • Bei 900mm und 5 Zylindern: Motor laeuft in engem Betriebsbereich — Slow Steaming ist wahrscheinlich problematisch.
  • Strukturelle Integritaet ist bei 900mm Bohrung mindestens so wichtig wie Tribologie.

Related components

  • Turbolader (groesste Einheiten)
  • Spuelluftkuehler
  • Separatoren
  • Alpha Lubricator
  • HPS
  • Motorblock-Struktur
  • Torsionsdaempfer
  • Kurbelwelle

Classification & regulatory

IMO Tier II. ECA: VLSFO/Scrubber. EEDI Phase 3 bei Neubauten.

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

Documentation

Manuals

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