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MAN Energy Solutions

8G50ME-C9.6

Name: MAN Energy Solutions 8G50ME-C9.6
Brand: MAN Energy Solutions
SKU: OSE-38508

The MAN 8G50ME-C9.6 is an eight‑cylinder, low‑speed 2‑stroke diesel main engine delivering up to 24 800 kW at 127 rpm, featuring hydraulic camless valve actuation (HPS/HCU) and electronic control for high efficiency and Tier III emissions compliance.

24800.0 kW

Power

Engine Specifications

Cylinders

500 mm

Bore

2300 mm

Stroke

24,800 kW

MCR Power

127.0 rpm

MCR RPM

2-stroke

Stroke Type

Family: MAN Energy Solutions ME/ME-C · Tier: Tier III · Fuel: HFO, VLSFO, MDO

Inspector Detail

▸

Designation decoded

8 = number of cylinders, G = Green Ultra Long Stroke, 50 = bore 500 mm, ME-C = MAN Electronically controlled Mark C, 9.6 = Mark 9.6 control generation.

Background

The 8G50ME-C with 2300mm stroke (S/B=4.6) and 8 cylinders is a powerful configuration for Handymax bulkers and medium-sized tankers that need maximum power from the 50er platform.

Calculated metrics

Stroke To Bore Ratio

4.6

Inspector checklist

Fuel system

8 cylinders, nozzles
Cat Fines: <15 ppm
VLSFO

Running gear and tribology

500mm liners: wear, BN
Crosshead: S/B=4.6, 8 LI
Stuffing box: 8 drainage lines

ME control system

HPS: 8 FIVA
Mark 9.6
CCU

Turbocharger

Bearing clearance, cleaning
Scavenge air pressure

Logbook reference values

Parameter	Expected	Deviation means
Exhaust gas temperature	320-420 °C	>25 °C spread
Scavenge air pressure	1.8-3.2 bar	TC
Cylinder oil consumption	0.7-1.2 g/kWh	BN
OMD	<2.5% LEL	Stuffing box

Common Failure Modes

Cat Fines

Symptoms: Wear

Causes: Separator

Preventive: <15 ppm.

Crosshead

Symptoms: LI

Causes: S/B=4.6

Preventive: LI every 8000 running hours.

Cold corrosion

Symptoms: Wear

Causes: BN

Preventive: Adjust BN.

Expert tips

💡 8G50: maximum power from the 50er platform.
💡 S/B=4.6: prioritise crosshead, 8 sets of spare parts.

Related components

Turbocharger Scavenge air cooler Separators Alpha Lubricator (8) 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.

Other Cylinder Configurations 50

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

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Manuals

operating
MAN B&W ME/ME-C/ME-B Engine Operation (OM-ME-C)
MAN Energy Solutions
maintenance
MAN B&W ME/ME-C Maintenance Manual (MM-ME-C)
MAN Energy Solutions
spare_parts
MAN B&W ME/ME-C Illustrated Parts Catalogue (IPC-ME-C)
MAN Energy Solutions
service_letter
SL-ME Service Letters Collection (SL-ME)
MAN Energy Solutions
technical_data
MAN CEAS Engine Calculation Tool (CEAS)
MAN Energy Solutions

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Equipment Model #38508 · ✓ still in production