⚓ Working on this equipment?
Ask the AI troubleshooter, log your hours on board and turn them into invoice-ready service reports — for this exact model.
Start free — 14 days →
No credit card required
🔧 5 verified suppliers & service companies for MAN Energy Solutions in the Maritime Network
Find suppliers →
MAN Energy Solutions
8S90MC-C8
The MAN Energy Solutions 8S90MC-C8 is an eight‑cylinder, low‑speed two‑stroke diesel main engine delivering up to 102 960 kW at 76 rpm, noted for its camshaft‑controlled fuel injection and constant‑pressure turbocharging.
102960.0 kW
Power
Engine Specifications
8
Cylinders
900 mm
Bore
3260 mm
Stroke
102,960 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
▸
Designation decoded
8 stands for 8 cylinders, S for Super-Long-Stroke, 90 for 900 mm bore, MC-C for the MAN B&W MC-Compact series, 8 for Mark 8.
Background
The S90MC-C8 with 8 cylinders is among the largest and most powerful conventional 2-stroke engines of all. 3260 mm stroke at 900 mm bore in 8-cylinder configuration for ULCCs and the very largest container ships. S/B 3.62 for the lowest speeds and maximum propulsion efficiency.
Calculated metrics
Stroke To Bore Ratio
3.622
Inspector checklist
Running Gear & Tribology
- Cylinder liners: 900 mm bore, 3260 mm stroke — enormous dimensions, wear measurement at a minimum of 12 positions with precision measuring equipment
- Piston rings: S/B 3.62 — significant side forces, document thrust-side wear
- Piston cooling: shaker cooling efficiency critical at long stroke — monitor oil temperatures
Crosshead & Stuffing Box
- Crosshead bearing: 3260 mm stroke = extreme inertial forces — temperature monitoring highest priority
- Stuffing box: long stroke produces increased sealing ring wear — shorter intervals
- Piston rod: deflection and surface condition — full measurement at 8 throws
Control & Hydraulics
- Camshaft drive: extreme loading at 8 cylinders and 3260 mm stroke
- Exhaust valve: large dimensions — hydraulics and valve seat on all 8 cylinders
- Fuel injection pumps: timing precision critical
Scavenge Air & Exhaust System
- Scavenge air receiver: walk-in — inspect all 8 ports systematically
- Turbocharger: 3-TC configuration on 8×S90 — check all three units
- Exhaust gas economiser: soot fire risk at part load
Cooling System
- Monitor piston cooling at each of the 8 cylinders
- Bore cooling and cylinder cover cooling
- NDT for thermal cracks at high operating hours
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Exhaust gas temperature per cylinder | 350–420 °C at MCR | spread >20 °C → systematic analysis |
| Scavenge air pressure | 2.5–3.2 bar | drop → TC efficiency |
| Pmax | ±3 bar cylinder balance | deviation → timing/compression |
| Crosshead bearing temperature | 55–65 °C | rise >5 °C → investigate immediately |
| Cylinder oil feed rate | 0.6–1.0 g/kWh | adjust to fuel |
Common Failure Modes
Crosshead bearing overload
Symptoms: temperature rise, metal particles, increasing bearing clearance
Causes: extreme inertial forces, insufficient oil supply, deflection deviation
Preventive: deflection quarterly, verify oil supply
Scavenge air receiver fire
Symptoms: temperature rise, smoke, alarm
Causes: oil accumulation from stuffing box leakage at long stroke, blow-by, part load
Preventive: inspect scavenge air receiver every 1,000 operating hours during slow steaming, keep drainage functional
Cylinder cover crack formation
Symptoms: cooling water in the combustion chamber, steam in the exhaust
Causes: thermal fatigue, scale deposits, thermal shock
Preventive: NDT every 16,000 operating hours, monitor cooling water chemistry
Expert tips
- 💡 8×S90MC-C8 is one of the physically largest conventional marine engines — engine length places the highest demands on foundation and alignment. Track the deflection trend over the service life
- 💡 On 3-TC configuration and slow steaming: TC cut-out with 1 or 2 TCs — regularly test the switchover procedure and shut-off valves
- 💡 Liners at 900 mm weigh >6 t, pistons >5 t — every replacement is a major undertaking. Prepare a wear forecast at least 2 years in advance for yard planning
Related components
Turbocharger (3-TC configuration)
Scavenge air cooler (large dimensions)
Exhaust gas economiser
Shaft line and thrust bearing
Foundation bolts and double bottom
Auxiliary blowers
Classification & regulatory
IMO Tier I compliant. EGR/SCR or combustion optimisation for Tier II. EEDI Phase 2/3 on large ships. MARPOL Annex VI — scrubber retrofit standard on the largest ships.
Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.
Other Cylinder Configurations 50
5L35MC-C8
5 cyl
· 6,450 kW
5L42MC-C8
5 cyl
· 10,100 kW
5L60MC-C8
5 cyl
· 21,000 kW
5L70MC-C8
5 cyl
· 31,150 kW
5L80MC-C8
5 cyl
· 42,000 kW
5S26MC-C8
5 cyl
· 3,700 kW
5S35MC-C8
5 cyl
· 7,650 kW
5S42MC-C8
5 cyl
· 12,950 kW
5S46MC-C8
5 cyl
· 15,500 kW
5S50MC-C8
5 cyl
· 18,650 kW
5S60MC-C8
5 cyl
· 28,250 kW
5S65MC-C8
5 cyl
· 35,000 kW
5S70MC-C8
5 cyl
· 40,400 kW
5S80MC-C8
5 cyl
· 51,000 kW
5S90MC-C8
5 cyl
· 64,350 kW
6K80MC-C8
6 cyl
· 43,500 kW
6K90MC-C6
6 cyl
· 30,780 kW
6K90MC-C8
6 cyl
· 56,700 kW
6K98MC-C8
6 cyl
· 85,020 kW
6L35MC-C8
6 cyl
· 7,740 kW
6L42MC-C8
6 cyl
· 12,120 kW
6L60MC-C8
6 cyl
· 25,200 kW
6L70MC-C8
6 cyl
· 37,380 kW
6L80MC-C8
6 cyl
· 50,400 kW
6S26MC-C8
6 cyl
· 4,440 kW
6S35MC-C8
6 cyl
· 9,180 kW
6S42MC-C8
6 cyl
· 15,540 kW
6S46MC-C8
6 cyl
· 18,600 kW
6S50MC-C8
6 cyl
· 22,380 kW
6S50MC-C8.2
6 cyl
· 9,960 kW
6S60MC-C8
6 cyl
· 33,900 kW
6S65MC-C8
6 cyl
· 42,000 kW
6S65MC-C8.2
6 cyl
· 16,440 kW
6S70MC-C8
6 cyl
· 48,480 kW
6S80MC-C8
6 cyl
· 61,200 kW
6S90MC-C8
6 cyl
· 77,220 kW
7K80MC-C6
7 cyl
· 28,980 kW
7K80MC-C8
7 cyl
· 50,750 kW
7K90MC-C8
7 cyl
· 66,150 kW
7K98MC-C7.1
7 cyl
· 40,040 kW
7K98MC-C8
7 cyl
· 99,190 kW
7L35MC-C8
7 cyl
· 9,030 kW
7L42MC-C8
7 cyl
· 14,140 kW
7L60MC-C8
7 cyl
· 29,400 kW
7L70MC-C8
7 cyl
· 43,610 kW
7L80MC-C8
7 cyl
· 58,800 kW
7S35MC-C8
7 cyl
· 10,710 kW
7S42MC-C8
7 cyl
· 18,130 kW
7S46MC-C8
7 cyl
· 21,700 kW
7S50MC-C8
7 cyl
· 26,110 kW
Components & Design
Component data being added…
Technical Data
unified from engine model
True
🤖 Ask about this model
One free question — answered like a marine engineer. No account needed.
Suppliers & Spare Parts
Direct links to manufacturer, datasheet, spare-parts portal and dealers — request access below.
📄 Request sourcing links & documents🛠 Manage this equipment in your fleet
Cases, daily reports, timesheets and AI troubleshooting in the OceanSphere Marine app — free for 14 days.
Start free trial →🔎 Suppliers & service for this equipment
Find manufacturers, repair shops and spare-part dealers in the Maritime Network — our global company directory.
Maritime Network →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
Working on this unit?
Log hours, photos and findings into an invoice-ready service report — OceanSphere Marine, 14-day free trial.
Need a service partner for MAN Energy Solutions?
114,000+ shipyards, suppliers and service companies in the Maritime Network directory.
Equipment Model #38260
· ✓ still in production