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MAN Energy Solutions

7S90ME-C10.5

Name: MAN Energy Solutions 7S90ME-C10.5
Brand: MAN Energy Solutions
SKU: OSE-38498

The MAN 7S90ME-C10.5 is a low‑speed, 2‑stroke marine diesel main engine delivering 41 300 kW at 84 rpm, distinguished by its hydraulic camshaft system and advanced electronic control for lower specific fuel consumption.

41300.0 kW

Power

1,540,000 kg

Weight

Engine Specifications

Cylinders

900 mm

Bore

3260 mm

Stroke

41,300 kW

MCR Power

84.0 rpm

MCR RPM

21.0 bar

MEP

158.0 g/kWh

SFC

2-stroke

Stroke Type

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

Inspector Detail ✓ verified

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Designation decoded

7 = number of cylinders, S = Super-Long-Stroke, 90 = bore 900 mm, ME = electronically controlled, C = Compact, 10.5 = Engine Mark (newest generation — highest specific power in the ME-C programme).

Background

The 7S90ME-C10.5 is the very latest Mark version of the large engine. Mark 10.5 offers the highest specific power and the latest EICU standard. MEP 21.0 bar at 900 mm bore — peak performance. For the largest VLCCs and ULCVs. Mark 10.5 is the most modern available configuration as of 2025/2026.

Calculated metrics

Stroke To Bore Ratio

3.622

Mean Effective Pressure Bar

21.0

Inspector checklist

Fuel system

7 injectors: 900 mm bore — spray coverage, Cat Fines
Fuel system: maximum sizing
ME timing: EICU Mark 10.5 — latest software

Running gear & tribology

Ratio 3.62 at 900 mm: high absolute forces, moderate relative side force
Liners: largest series, document wear
Cylinder oil: Alpha Lubricator latest generation

Control & hydraulics

7 large HCUs Mark 10.5: latest revision
EICU Mark 10.5: most modern diagnostics (PMI, CoCoS, AI prediction)
Hydraulic oil: cleanliness

Exhaust system

TC (3x typical): matching with Mark 10.5
Exhaust boiler
Scavenge air receiver: large volume

Foundation & structure

7S90: large engine >800 t, deflection mandatory
Tank top NDT
Torsional vibration damper

Logbook reference values

Parameter	Expected	Deviation means
Exhaust gas temperature per cylinder	305-365 °C	>20 °C → check injection immediately
P-max	±5 bar (Mark 10.5)	Timing
MEP	~21.0 bar	Deviation → power
Crankshaft deflection	per MAN S90 7-cyl Mark 10.5	Exceedance → class
System oil flash point	>200 °C	Degradation

Common Failure Modes

Cat Fine damage at 900 mm

Symptoms: Most expensive damage case (>€100k per liner)

Causes: Cat Fines

Preventive: Maximum separator use; fuel analysis at every bunkering

Early operation issues Mark 10.5

Symptoms: Software anomalies, sensor calibration

Causes: Newest Mark, limited fleet experience

Preventive: Carefully evaluate EICU alarm log; contact MAN support for anomalies

Foundation

Symptoms: Deflection

Causes: Large engine, loading

Preventive: Measure closely; NDT

Expert tips

💡 Mark 10.5 is the very latest generation — fleet experience is minimal. Document every issue and report it to MAN.
💡 EICU Mark 10.5 may offer AI-based predictive maintenance features — use and validate them.
💡 MEP 21.0 bar at 900 mm: highly loaded engine. Document the wear trend seamlessly from the start.
💡 Liner costs at 900 mm: >€100k per unit. Cat Fine management has the absolute highest economic priority.

Related components

Turbocharger (3x) Separator — economically vital Guide shoes — 7x, high loads Foundation/tank top EICU Mark 10.5 — latest diagnostics Torsional vibration damper

Classification & regulatory

IMO Tier III (Mark 10.5 newbuild). MARPOL Annex VI. EEDI Phase 3 / EEXI. CII rating maximally optimised for the latest build period.

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 #38498 · ✓ still in production