OceanSphereFree accountLog inDEENPL
OceanSphereENGINES
Request a part
Library› Engine Room› Main Engines (2-Stroke)› Main Engine 2-Stroke› MAN Energy Solutions 8S46ME-B9.5
MAN Energy Solutions

8S46ME-B9.5

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

Technical data from manufacturer or class sources · not yet verified by a person
24,800 kWPower
8Cylinders
460 mmBore
1,932 mmStroke
129 rpmMCR RPM

The MAN 8S46ME-B9.5 is an 8‑cylinder, low‑speed two‑stroke main propulsion engine delivering 24 800 kW at 129 rpm, distinguished by its camshaft‑driven exhaust valve and electronic fuel injection for reduced part count and Tier III emissions compliance.

Inspection

Inspector Detail ✓ verified

Designation decoded

8 steht für 8 Zylinder, S für Super-Long-Stroke, 46 für 460 mm Bohrung, ME-B für elektronisch gesteuerte Kraftstoffeinspritzung mit nockenwellengesteuertem Auslassventil, 9.5 für Mark 9.5.

Background

Die S46ME-B9.5 mit 8 Zylindern ist die leistungsstärkste Variante der 46er-Bohrungsklasse in der ME-B-Reihe. S/B 4.2. Typisch für Supramax/Ultramax-Bulker. 8 Zylinder für maximale Leistung und bestes Schwingungsverhalten.

Calculated metrics

Stroke to bore ratio4.2

Inspector checklist

Laufzeug & Tribologie
  • Zylinderlaufbuchsen: S/B 4.2 — hohe Seitenkräfte
  • Kolbenringe: Stoßspiel und Ring-Stabilität
  • Alpha-Lubricator: Dosierung
Kreuzkopf & Stopfbuchse
  • Kreuzkopflager: Temperatur über 8 Zylinder
  • Stopfbuchse: Drainage
  • Kolbenstange: Rundlauf
Elektronische Steuerung
  • ME-B: Sensoren, EICU
  • Nockenwelle: Kettenlängung
  • Software
Spülluft & Abgassystem
  • Spülluftkasten: Inspektionsöffnungen
  • Turbolader: 1-2 TC
  • Abgastemperatur über 8 Zylinder

Logbook reference values

ParameterExpectedDeviation means
Abgastemperatur nach Zylinder350–420 °C bei MCRSpread >15 °C → Einspritzung prüfen
Spülluftdruck2.2–3.0 barAbfall → TC/Kühler
Pmax±2 bar ZylindergleichgewichtAbweichung → Steuerung
Zylinderöl-Feed-Rate0.5–0.8 g/kWhAlpha-Lubricator kalibrieren

Common Failure Modes

  • Kaltverschleiß

    Symptoms: Erhöhte Wear-Rate

    Causes: Kühlwasser unter Taupunkt, Feed-Rate

    Preventive: Kühlwasser >65 °C, Alpha-Lubricator kalibrieren

  • Düsenverschleiß

    Symptoms: Ungleichmäßige Verbrennung

    Causes: Kraftstoff-Qualität

    Preventive: Düsen prüfen

  • Elektronik-Fehler

    Symptoms: Zylinderabschaltung

    Causes: Sensor

    Preventive: Kalibrierung

Expert tips

  • 8×S46ME-B9.5: Gutes Schwingungsverhalten, keine Barred Speed Range — Standard-ME-B-Wartung gilt
  • 8 Zylinder bei 460 mm: Bei häufigen Hafenanlaufen (Supramax) die ME-B-Steuerung für Manöverbetrieb korrekt konfiguriert
  • ME-B mit elektronischer VIT: Bei Kraftstoffwechsel HFO→VLSFO Einspritzparameter anpassen

Related components

  • Turbolader (1-2 TC)
  • Alpha-Lubricator
  • EICU
  • Kraftstoff-Aufbereitung
  • Hilfsbläser

Classification & regulatory

IMO Tier II. Mit EGR/SCR Tier III. EEDI. MARPOL Annex VI — VLSFO.

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

Need this part?

Request a quote for this model.

Free of charge — send us your request for MAN Energy Solutions equipment. Our team checks it and replies by e-mail.

Makers and authorised dealers rarely quote marine equipment without the vessel. With these details we can check availability and prices faster; without them we may have to ask first, which can cost a few days. If you cannot share the vessel, a photo of the equipment’s rating plate does the same job — attach it below or send it as a reply to our confirmation e-mail.

Your contact details are not published. No account required.
Related models

Also in Main Engine 2-Stroke.

Other models of the same equipment type, MAN Energy Solutions first.

MAN Energy Solutions
10G50ME-C9.6
MAN Energy Solutions
10G50ME-C9.6-GI
MAN Energy Solutions
10G80ME-C9.5
MAN Energy Solutions
10G80ME-C9.5-GA
MAN Energy Solutions
10G80ME-C9.5-GI
MAN Energy Solutions
10G80ME-C9.5-LGI
MAN Energy Solutions
10G90ME-C10.5
MAN Energy Solutions
10G95ME-C10.5
MAN Energy Solutions
10G95ME-C10.5-GI
MAN Energy Solutions
10G95ME-C10.5-LGI
By manufacturer MAN Energy SolutionsWinGDSulzerWärtsiläMitsubishiElectro-Motive DieselHyundaiDoosanHudong-ZhonghuaJapan EngineAkasaka Diesel (Mitsubishi UEC licensed)National Railway EquipmentHSD EngineKawasakiProgress Rail Locomotive, Inc.All manufacturersSpare parts by equipmentNew here? Create a free account Can't read the plate? Try the nameplate scanner All MAN Energy Solutions models More like 8S46ME-B9.5
Would you like to know more?

A person reads every request and replies by e-mail.

Tell us what you need for this MAN Energy Solutions 8S46ME-B9.5 — a part, a service call, a second opinion. Are you MAN Energy Solutions? Claim this brand page.

Request a part for this modelRequest service

Service engineer? Write the day report for this 8S46ME-B9.5 in OceanSphere Work — photos, hours and parts, as a PDF for the owner. Try it free for 14 days →

Frequently asked

Three things people ask first.

Is this model's data free?

Yes. Specifications, documents and service notes for this model are readable without an account. An account adds saved searches and requests, nothing is taken away.

Can you find a part for this exact model?

Yes. Tell us the manufacturer, the model and what you need — a person reads every request and replies by e-mail.

The specifications look wrong — what now?

Send us the nameplate or the correct value. We check it against the manufacturer datasheet or class-society record and update the page.