7G45ME-B9.5
The MAN 7G45ME-B9.5 is a 2‑stroke low‑speed main engine delivering up to 15.75 MW at 129 rpm, featuring a camshaft‑driven exhaust valve and electronic fuel injection for Tier III emissions compliance.
Engine Specifications
Inspector Detail
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Designation decoded
7 stands for 7 cylinders, G for Green Ultra-Long-Stroke, 45 for 450 mm bore, ME-B for electronically controlled fuel injection with camshaft-controlled exhaust valve, 9.5 for Mark 9.5.
Background
The G45ME-B9.5 with 7 cylinders offers more power than the 5- and 6-cylinder variants. S/B 4.6 for lowest speeds and maximum efficiency. ME-B technology. 7 cylinders for mid-size merchant vessels.
Calculated metrics
Inspector checklist
- Cylinder liners: S/B 4.6 — extremely high side forces, prioritize thrust-side wear
- Piston rings: Maximum side pressure — monitor ring stability closely
- Alpha Lubricator: Electronic dosing — calibration and quill flow
- Crosshead bearing: Compare temperature across 7 cylinders
- Stuffing box: High relative movement at S/B 4.6 — monitor drainage
- Piston rod: Run-out
- ME-B control: Sensors, EICU, actuators
- Camshaft for exhaust valve: Chain elongation and cams
- SaCoSone software updates
- Scavenge air box: Inspection openings — oil ingress risk with G-type
- Turbocharger: Single TC — cleaning
- Exhaust temperature across 7 cylinders
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Exhaust temperature by cylinder | 350–420 °C at MCR | Spread >15 °C → check electronic injection |
| Scavenge air pressure | 2.5–3.2 bar | Drop → TC/cooler |
| Pmax | ±2 bar cylinder balance | Deviation → control system/nozzles |
| Cylinder oil feed rate | 0.5–0.8 g/kWh | Calibrate Alpha Lubricator |
Common Failure Modes
Expert tips
- 💡 7-cylinder G45ME-B9.5: The 7-cylinder configuration can cause torsional vibrations at certain speeds — ensure the Barred Speed Range is correctly configured in the ME-B control system
- 💡 ME-B with LDF (Load-Dependent Feed): Especially important with G-type — higher feed rate at full load than at part load
- 💡 Inspect camshaft with ME-B — even though smaller than with MC, the chain case is still a maintenance point
Related components
Classification & regulatory
IMO Tier II compliant. Tier III with EGR/SCR. EEDI-optimized. MARPOL Annex VI — VLSFO.
Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.
Other Cylinder Configurations 23
Components & Design
Component data being added…
Technical Data
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