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MAN Energy Solutions
5S90MC-C8
The MAN 5S90MC-C8 is a low‑speed, crosshead, 5‑cylinder main propulsion engine delivering up to 64 MW at 76 rpm, noted for its camshaft‑controlled injection and constant‑pressure turbocharging.
64350.0 kW
Power
Engine Specifications
5
Cylinders
900 mm
Bore
3260 mm
Stroke
64,350 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
✓ verified
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Designation decoded
5 cylinders, S=Super-Long-Stroke, 90=bore 900 mm, MC=mechanical, C=Compact, 8=Mark 8.
Background
5-cylinder S-type MC-C with 900 mm bore and 3,260 mm stroke. One of the largest MC-C engines, predecessor of the S90ME-C. 5 cylinders at 900 mm is unusually compact. Legacy fleet on VLCCs.
Calculated metrics
Stroke To Bore Ratio
3.622
Inspector checklist
Running gear & tribology
- Cylinder liners: 900 mm, stroke-to-bore ratio 3.62, ultrasonic testing at every docking
- Piston rings: extremely long circumferences
- Crosshead: extreme piston mass, temperature
Camshaft control
- Camshaft: wear — high cam load at 900 mm
- Fuel pumps: maximum injection quantities
- Exhaust valve: largest valve mass
- Cam box: oil
Fuel system
- Injection valves: highest throughput
- Purifier redundancy
Sealing systems
- Stuffing boxes: largest piston rod
- Exhaust valve: stellite, rotocap
- Scavenge air box: drainage
Bedplate
- Crankshaft deflection: regular at 900 mm, at various draughts
- Main bearings: maximum bearing sizes
- Torsional vibration damper: critical with 5 cylinders
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Exhaust gas temperature after cylinder | 330-405 °C at MCR | >25 °C spread |
| Pmax | As per shop test ±3 bar | Spread >5 bar |
| Scavenge air pressure | 3.0-3.8 bar abs | Too low |
| Crankshaft deflection | As per MAN S90 | Exceedance |
Common Failure Modes
Liner cracking
Symptoms: Cooling water loss
Causes: 900 mm maximum surface area, Thermal stress
Preventive: Cooling water chemistry pH 9.0-9.5, ultrasonic testing.
Crosshead bearing damage
Symptoms: Temperature, metal detector
Causes: Extreme piston mass, Slow steaming
Preventive: Daily temperature evaluation.
Torsional vibrations
Symptoms: Vibrations
Causes: 5 cylinders at 900 mm
Preventive: Torsional vibration damper every 4-5 years.
Expert tips
- 💡 5 × 900 mm MC-C: very rare configuration — pay special attention to torsional vibrations and firing order optimization
- 💡 MC-C at 900 mm: ME retrofit would be technically possible, but check economics for 5 cylinders
- 💡 Thermal inertia enormous — allow 30+ minutes warm-up time
Related components
Camshaft
Torsional vibration damper (critical!)
Fuel pumps
Turbocharger (2-3 units)
Crankshaft and main bearings
Classification & regulatory
IMO Tier I/II. EEXI possibly EPL.
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
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
7S60MC-C8
7 cyl
· 39,550 kW
Components & Design
Component data being added…
Technical Data
unified from engine model
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Suppliers & Spare Parts
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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
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Equipment Model #38203
· ✓ still in production