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MAN Energy Solutions

9K90MC-C8

Name: MAN Energy Solutions 9K90MC-C8
Brand: MAN Energy Solutions
SKU: OSE-38267

The MAN 9K90MC-C8 is a high‑power, low‑speed 2‑stroke main propulsion engine featuring camshaft‑controlled fuel injection and exhaust valves, delivering up to 85 MW at 76 rpm.

85050.0 kW

Power

Engine Specifications

Cylinders

900 mm

Bore

2500 mm

Stroke

85,050 kW

MCR Power

76.0 rpm

MCR RPM

2-stroke

Stroke Type

Family: MAN B&W MC/MC-C · Tier: Tier II · Fuel: HFO, VLSFO, MDO

Inspector Detail

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Designation decoded

9 stands for 9 cylinders, K for Short-Stroke (Kurzhub), 90 for 900 mm bore, MC-C for the MAN B&W MC-Compact series, 8 for Mark 8.

Background

The K90MC-C8 with 9 cylinders is a high-performance large engine in the 900 mm bore class. S/B 2.78 for higher speeds. 9×900 mm generates enormous total output for the world's largest ships.

Calculated metrics

Stroke To Bore Ratio

2.778

Inspector checklist

Running Gear & Tribology

Cylinder liners: 900 mm bore — wear measurement at a minimum of 12 positions per cylinder
Piston rings: K type — increased stroke frequency, document ring wear
Cylinder lubrication: even quill distribution critical at 900 mm

Crosshead & Stuffing Box

Crosshead bearing: 9 bearings — compare temperature trend
Stuffing box: monitor drainage on 9 cylinders
Piston rod: deflection at all 9 throws

Control & Hydraulics

Camshaft drive: 9 cylinders at higher speed — maximum dynamic loading
Exhaust valves: large dimensions at 900 mm — check all 9
Fuel injection pumps: timing uniformity

Scavenge Air & Exhaust System

Scavenge air receiver: walk-in — inspect all 9 ports
Turbocharger: 3-TC configuration — check and compare all
Exhaust gas economiser for soot fire risk

Cooling System

Piston cooling at each of the 9 cylinders
Bore cooling and cylinder cover cooling
NDT at high operating hours

Logbook reference values

Parameter	Expected	Deviation means
Exhaust gas temperature per cylinder	330–400 °C at MCR	spread >15 °C → investigate
Scavenge air pressure	2.8–3.5 bar	drop → TC
Pmax	±3 bar cylinder balance	deviation → timing
Crosshead bearing temperature	55–65 °C	rise → investigate immediately
Cooling water temperature	80–85 °C	check individual cylinder deviation

Common Failure Modes

Camshaft drive overload

Symptoms: timing drift, noise, chain elongation

Causes: 9 cylinders at K-type speed = maximum dynamic loading, material fatigue, insufficient lubrication

Preventive: inspect chain box every 10,000-12,000 operating hours

Uneven cylinder lubrication at 900 mm

Symptoms: local dry running, scuffing

Causes: clogged quills, uneven oil pressure

Preventive: test each quill individually

Cylinder cover crack formation

Symptoms: cooling water in the combustion chamber

Causes: thermal fatigue at 900 mm, scale deposits

Preventive: NDT every 16,000 operating hours, monitor cooling water chemistry

Expert tips

💡 9×K90MC-C8 is one of the most powerful MC/MC-C engines — engine length and total mass place the highest demands on hull structure and foundation
💡 Cylinder covers at 900 mm weigh >20 t — with 9 cylinders, a major overhaul requires considerable logistics and crane capacity
💡 On 3-TC configuration: regularly compare the load distribution between the TCs — asymmetry can indicate exhaust duct issues

Related components

Turbocharger (3 TC) Scavenge air cooler Shaft line and thrust bearing Foundation bolts and double bottom Vibration damper Auxiliary blowers

Classification & regulatory

IMO Tier I compliant. Combustion optimisation or EGR/SCR for Tier II. EEDI on large ships. MARPOL Annex VI — scrubber or VLSFO.

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

Other Cylinder Configurations 50

Components & Design

Component data being added…

Technical Data

unified from engine model True

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Manuals

operating
MAN B&W MC/MC-C Engine Operating Manual (OM-MC-C)
MAN Energy Solutions
maintenance
MAN B&W MC/MC-C Maintenance Manual (MM-MC-C)
MAN Energy Solutions
spare_parts
MAN B&W MC/MC-C Illustrated Parts Catalogue (IPC-MC-C)
MAN Energy Solutions
project_guide
MAN B&W Project Guide MC/MC-C (PG-MC-C)
MAN Energy Solutions

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Equipment Model #38267 · ✓ still in production