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MAN Energy Solutions
7S46ME-C9.6
The MAN 7S46ME-C9.6 is a medium‑speed 2‑stroke main propulsion engine delivering 21 700 kW at 129 rpm, distinguished by its hydraulic camshaft‑free design and advanced electronic control for low specific fuel consumption.
21700.0 kW
Power
Engine Specifications
7
Cylinders
460 mm
Bore
1932 mm
Stroke
21,700 kW
MCR Power
129.0 rpm
MCR RPM
2-stroke
Stroke Type
Family: MAN Energy Solutions ME/ME-C
· Tier: Tier III
· Fuel: HFO, VLSFO, MDO
Inspector Detail
✓ verified
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Designation decoded
7 = Zylinderzahl, S = Super-Long-Stroke, 46 = Bohrung 460 mm, ME = elektronisch gesteuert, C = Compact, 9.6 = Engine Mark.
Background
Die 7S46ME-C mit 460 mm Bore, 1932 mm Hub (Ratio 4.2), 7 Zylinder. Nischen-Konfiguration für spezifische Leistungsanforderungen. 7 Zylinder für besten Massenausgleich.
Calculated metrics
Stroke To Bore Ratio
4.2
Inspector checklist
Brennstoffsystem
- Injektoren: Cat-Fines, 7 Stück
- Fuel-System
- ME Timing
Laufzeug & Tribologie
- Ratio 4.2: Moderate bis hohe Seitenkräfte
- Laufbuchsen: Verschleiß
- Zylinderöl: BN
Steuerung & Hydraulik
- 7 HCUs
- EICU
- Hydrauliköl
Abgassystem
- TC (1x)
- Abgaskessel
- Spülluft-Receiver
Dichtungen
- 7 Stopfbuchsen
- Abgasventile
- Spülluft-Klappen
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Abgastemperatur nach Zylinder | 345-415 °C | >25 °C → Einspritzung |
| P-max | ±5 bar | Timing |
| Spülluftdruck | 2.0-3.0 bar | TC |
| Zylinderöl-Feed-Rate | 0.7-1.1 g/kWh | Fuel-abhängig |
| Hydrauliköl-Druck | 200-300 bar | HCU |
Common Failure Modes
Cat-Fine-Schäden
Symptoms: Verschleiß
Causes: Cat-Fines
Preventive: Separator
Cold Corrosion
Symptoms: Liner-Verschleiß
Causes: BN niedrig
Preventive: BN anpassen
Zylinderbalance
Symptoms: Temperatur-Spreizung
Causes: Ungleicher Verschleiß
Preventive: Performance-Monitoring
Expert tips
- 💡 460 mm Bore: Nische, Ersatzteile-Verfügbarkeit prüfen.
- 💡 7S46 mit Ratio 4.2: Guter Kompromiss aus Seitenkraft und Drehzahl bei exzellentem Massenausgleich.
- 💡 7 Zylinder S46: Seltene Konfiguration — Installationsqualität bei neueren Schiffen prüfen.
Related components
Turbolader (1x)
Separator
Alpha Lubricator
Fuel-System
Ladeluftkühler
Classification & regulatory
IMO Tier II. Tier III in ECA. MARPOL Annex VI.
Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.
Other Cylinder Configurations 50
5G40ME-C9.6
5 cyl
· 8,550 kW
5G45ME-C9.6
5 cyl
· 11,250 kW
5G50ME-C9.6
5 cyl
· 15,500 kW
5G60ME-C9.6
5 cyl
· 24,500 kW
5G65ME-C9.6
5 cyl
· 29,350 kW
5G70ME-C9.6
5 cyl
· 34,350 kW
5G80ME-C9.6
5 cyl
· 44,500 kW
5G90ME-C9.6
5 cyl
· 56,000 kW
5G95ME-C9.6
5 cyl
· 63,500 kW
5S40ME-C9.6
5 cyl
· 7,850 kW
5S46ME-C9.6
5 cyl
· 15,500 kW
5S50ME-C9.6
5 cyl
· 18,650 kW
5S60ME-C9.6
5 cyl
· 28,250 kW
5S65ME-C9.6
5 cyl
· 35,000 kW
5S70ME-C9.6
5 cyl
· 40,400 kW
5S80ME-C9.6
5 cyl
· 51,000 kW
5S90ME-C9.6
5 cyl
· 64,350 kW
5S95ME-C9.6
5 cyl
· 71,000 kW
6G40ME-C9.6
6 cyl
· 10,260 kW
6G45ME-C9.6
6 cyl
· 13,500 kW
6G50ME-C9.6
6 cyl
· 18,600 kW
6G60ME-C9.6
6 cyl
· 29,400 kW
6G65ME-C9.6
6 cyl
· 35,220 kW
6G70ME-C9.5
6 cyl
· 20,520 kW
6G70ME-C9.6
6 cyl
· 41,220 kW
6G80ME-C9.6
6 cyl
· 53,400 kW
6G90ME-C9.6
6 cyl
· 67,200 kW
6G95ME-C9.6
6 cyl
· 76,200 kW
6S40ME-C9.6
6 cyl
· 9,420 kW
6S46ME-C9.6
6 cyl
· 18,600 kW
6S50ME-C8.5
6 cyl
· 10,680 kW
6S50ME-C9.6
6 cyl
· 22,380 kW
6S60ME-C9.6
6 cyl
· 33,900 kW
6S65ME-C9.6
6 cyl
· 42,000 kW
6S70ME-C8.5
6 cyl
· 18,660 kW
6S70ME-C9.6
6 cyl
· 48,480 kW
6S80ME-C9.5
6 cyl
· 24,000 kW
6S80ME-C9.6
6 cyl
· 61,200 kW
6S90ME-C9.6
6 cyl
· 77,220 kW
6S95ME-C9.6
6 cyl
· 85,200 kW
7G40ME-C9.6
7 cyl
· 11,970 kW
7G45ME-C9.6
7 cyl
· 15,750 kW
7G50ME-C9.6
7 cyl
· 21,700 kW
7G60ME-C9.6
7 cyl
· 34,300 kW
7G65ME-C9.6
7 cyl
· 41,090 kW
7G70ME-C9.6
7 cyl
· 48,090 kW
7G80ME-C9.5
7 cyl
· 34,930 kW
7G80ME-C9.6
7 cyl
· 62,300 kW
7G90ME-C9.6
7 cyl
· 78,400 kW
7G95ME-C9.5
7 cyl
· 46,550 kW
Components & Design
Alpha Lubricator Control
MAN Energy Solutions
MAN Alpha Lubricator Mk III
Feed rate 0.6-1.2 g/kWh depending on fuel sulfur. Monitor via Alpha ACC (Adaptive Cylinder lubrication Control).
Lead time: 6 wk
25.0 kg
Crankcase Oil Mist Detector
Schaller Automation
Schaller Visatron VN215+ OMD
SOLAS mandatory. Test weekly. Clean sensor optics every 4,000 hrs. Replace reference cell every 2 years.
Lead time: 2 wk
8.0 kg
Crosshead Bearing
MAN Energy Solutions
MAN Crosshead Bearing (thin-shell, white metal)
Inspect at 16,000 hrs. Check bearing clearance. Monitor via bearing temperature and oil analysis.
Lead time: 12 wk
380.0 kg
Cylinder Liner
MAN Energy Solutions
MAN ME-C Cylinder Liner (bore-cooled)
Wear monitoring via calibration. Max wear 0.8% of bore. Replace typically at 32,000-60,000 hrs.
Lead time: 16 wk
3500.0 kg
Engine Control Unit (ECU / ECS)
MAN Energy Solutions
MAN ECS (Engine Control System)
Dual-redundant ECU. Software updates via MAN PrimeServ. Keep backup CCU on board.
Lead time: 8 wk
45.0 kg
Exhaust Valve (& Valve Seat)
MAN Energy Solutions
MAN Exhaust Valve (Nimonic/Stellite)
Overhaul at 8,000-12,000 hrs. Stellite-faced seat. Grinding/lapping at overhaul. Check spindle guide clearance.
Lead time: 8 wk
320.0 kg
FIVA Valve (ME-type)
MAN Energy Solutions
MAN FIVA Valve (ME-C)
FIVA = Fuel Injection Valve Actuator. Overhaul at 8,000 hrs. Critical for timing accuracy.
Lead time: 8 wk
35.0 kg
Fuel Booster Module (ME-type)
MAN Energy Solutions
MAN Fuel Booster Module
Overhaul at 16,000 hrs. Pressure test fuel pipes. Check plunger wear with micrometer.
Lead time: 12 wk
450.0 kg
Fuel Valve (Injector)
MAN Energy Solutions
MAN ME-C Fuel Valve Assembly
Overhaul every 4,000-8,000 hrs. Pressure test after overhaul. Nozzle replacement at 8,000 hrs.
Lead time: 4 wk
85.0 kg
Governor (Electronic/Woodward)
Woodward
Woodward 723PLUS Digital Governor
Electronic governor integrated with ECS on ME engines. Firmware updates via Woodward service.
Lead time: 4 wk
15.0 kg
Hydraulic Cylinder Unit (HCU)
MAN Energy Solutions
MAN HCU (ME-C type, per cylinder)
One HCU per cylinder. FIVA valve overhaul at 8,000 hrs. Booster overhaul at 16,000 hrs.
Lead time: 12 wk
1200.0 kg
Hydraulic Power Supply (HPS)
MAN Energy Solutions
MAN HPS Unit (ME-C)
Servo oil SAE 30 / System oil. Filter change every 4000 hrs. Monitor servo oil pressure.
Lead time: 16 wk
2800.0 kg
Main Bearings
MAN Energy Solutions
MAN Main Bearing Shells (white metal/tri-metal)
Inspect at 16,000 hrs. Jack up crankshaft for clearance measurement. Replace at signs of overlay fatigue.
Lead time: 8 wk
250.0 kg
PMI (Pressure Measurement Indicator)
MAN Energy Solutions
MAN PMI Sensor System
Online cylinder pressure monitoring. Calibrate sensors annually. Essential for combustion optimization.
Lead time: 4 wk
5.0 kg
Piston Crown
MAN Energy Solutions
MAN ME-C Piston Crown (bore-cooled Cr-Mo steel)
Inspect at 16,000 hrs. Pull piston at 16,000-24,000 hrs. Check cooling bores with borescope.
Lead time: 16 wk
1800.0 kg
Piston Ring Pack
MAN Energy Solutions
MAN Piston Ring Set (CPR / AL rings)
CPR (Controlled Pressure Relief) top ring. Replace at 8,000-16,000 hrs depending on wear.
Lead time: 4 wk
60.0 kg
Scavenge Air Cooler
MAN Energy Solutions
MAN Scavenge Air Cooler (plate-type)
Clean air side every 4,000-8,000 hrs (chemical/HP water). Monitor pressure drop and charge air temp.
Lead time: 16 wk
5500.0 kg
Turbocharger Unit (ABB/MHI/Napier)
ABB Turbocharging
ABB A175-L Turbocharger
Overhaul at 12,000-16,000 hrs. Water washing every 24-100 hrs depending on load.
Lead time: 12 wk
4500.0 kg
Technical Data
unified from engine model
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Maritime Network →Manuals
-
operating
MAN B&W ME/ME-C/ME-B Engine Operation (OM-ME-C)
-
maintenance
MAN B&W ME/ME-C Maintenance Manual (MM-ME-C)
-
spare_parts
MAN B&W ME/ME-C Illustrated Parts Catalogue (IPC-ME-C)
-
service_letter
SL-ME Service Letters Collection (SL-ME)
- technical_data
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Equipment Model #38485
· ✓ still in production