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Library› Engine Room› Main Engines (2-Stroke)› Main Engine 2-Stroke› MAN Energy Solutions 6G70ME-C9.5
MAN Energy Solutions

6G70ME-C9.5

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

Technical data from manufacturer or class sources · not yet verified by a person
20,520 kWPower
6Cylinders
700 mmBore
3,256 mmStroke
91 rpmMCR RPM
680,000 kgWeight

The MAN 6G70ME-C9.5 is a six‑cylinder, low‑speed 2‑stroke main propulsion engine delivering up to 20 520 kW at 91 rpm, featuring hydraulic camless valve actuation and electronic control for high efficiency.

Inspection

Inspector Detail

Designation decoded

6 = Zylinderzahl, G = Green Ultra Long Stroke, 70 = Bohrung 700 mm, ME-C = MAN Electronically controlled Mark C, 9.5 = Mark 9.5 Steuerungsgeneration.

Background

Die 6G70ME-C9.5 ist eine Mark-9.5-Version der leistungsstarken G70-Plattform. Mark 9.5 ist der direkte Vorgaenger von 9.6 — nahezu identische Technik mit minimalen Software-/Hardware-Unterschieden. MEP 21 bar zeigt hohe Leistungsdichte. Fuer grosse Containerschiffe und VLCCs.

Calculated metrics

Stroke to bore ratio4.65
Mean Effective Pressure (bar)21

Inspector checklist

Kraftstoffsystem
  • Kraftstoffpumpen: Spray-Pattern fuer 700mm-Brennraum
  • Cat-Fines: <15 ppm, bei 700mm grosses Schadenspotenzial
  • VLSFO
Laufzeug und Tribologie
  • Laufbuchsen 700mm: Bei MEP 21 bar hoehere Belastung, Wear, BN
  • Kolbenringe: Thermische Verformung bei 700mm
  • Kreuzkopf: S/B=4.65, 3256mm Hub, extreme Seitenkraefte, LI kritisch
  • Stopfbuchse: Langer Hub, Drainage
ME-Steuerung
  • HPS 300 bar: Hohe Volumenstroeme
  • FIVA Mark 9.5
  • CCU: Software-Unterschiede zu 9.6 minimal
Turbolader
  • Grosse Einheit
  • Reinigung
  • Spuelluftdruck bei 21 bar MEP hoch

Logbook reference values

ParameterExpectedDeviation means
Abgastemperatur330-430 Grad C (hoeher wegen MEP 21)>25 Grad C Spread
Spuelluftdruck2.5-3.8 barTC
Zylindeloelverbrauch0.8-1.3 g/kWhBN, Feed-Rate
PmaxHoch wegen MEP 21Timing
OMD<2.5% LELStopfbuchse

Common Failure Modes

  • Cat-Fine-Schaeden

    Symptoms: Wear bei 700mm

    Causes: Separator

    Preventive: <15 ppm.

  • Kreuzkopf-Lagerschaden

    Symptoms: Klopfen, LI, Temperatur

    Causes: S/B=4.65, 3256mm Hub, hoher MEP

    Preventive: LI alle 8000 Bh.

  • Liner-Riss bei hohem MEP

    Symptoms: Kuehlwasser-Leckage, Kompressionsabfall

    Causes: Thermische Ermuedung bei 21 bar MEP, Fehlende Liner-Inspektion

    Preventive: Liner-Wandstaerke alle 24000 Bh messen, Kuehlwasser auf Oelkontamination pruefen.

Expert tips

  • Mark 9.5 vs. 9.6: Minimale Unterschiede, aber Software-Updates von MAN koennen Effizienz-Verbesserungen bringen — pruefen ob Update verfuegbar.
  • MEP 21 bar: Motor laeuft am oberen Ende seiner Leistungsfaehigkeit — thermische Belastung der Laufbuchse ist hoeher als bei Standard-MEP.
  • G70 mit 6 Zylindern und 3256mm Hub: Kreuzkopf-Inspektion ist die Prioritaet Nr. 1.

Related components

  • Turbolader (grosse Einheit)
  • Spuelluftkuehler
  • Separatoren
  • Alpha Lubricator (6)
  • 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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