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MAN Energy Solutions
6K98MC-C8
The MAN Energy Solutions 6K98MC‑C8 is a low‑speed, six‑cylinder, two‑stroke diesel engine delivering up to 85 020 kW (≈115 000 hp) at 97 rpm, used as the main propulsion unit for large merchant vessels.
85020.0 kW
Power
Engine Specifications
6
Cylinders
980 mm
Bore
2400 mm
Stroke
85,020 kW
MCR Power
97.0 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
6 cylinders, K=Short-Stroke, 98=980 mm, MC-C8. 980 mm bore, 2,400 mm stroke. Mechanical predecessor of the K98ME-C.
Background
6K98MC-C8 — the largest mechanically controlled marine engine, with a 980 mm bore. Predecessor of the electronic K98ME-C. K-type for maximum power. Found on the largest container ships of the older generation.
Calculated metrics
Stroke To Bore Ratio
2.45
Inspector checklist
Running gear & tribology
- 980 mm — largest bore of all mechanical engines. CLU is safety-critical. Physical entry.
- Piston rings: longest mechanical rings ever built — highest ring breakage risk.
- Crosshead: highest forces of all mechanical engines.
- Piston crown: extreme load.
Control
- Largest camshaft in the world (mechanical).
- Largest injection pumps.
- Largest exhaust valves.
Fuel
- Catfines: absolute priority at record throughputs.
- Separators: high capacity.
Turbocharger
- Turbocharger (3-4 units).
Structural
- NDT mandatory — non-negotiable.
- Tie rods: ultrasonic testing.
- Foundation.
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Exhaust gas temperature | Manufacturer specification | >15 °C → investigate immediately |
| Piston cooling oil | <55 °C | Increase → problem |
Common Failure Modes
Piston ring breakage
Symptoms: CLU jump, scavenge fire risk
Causes: Fatigue at 980 mm
Preventive: CLU trend as early warning.
Camshaft erosion
Symptoms: Timing drift
Causes: Highest mechanical forces of all camshafts
Preventive: Profile measurement.
Engine block cracking
Symptoms: Leakage
Causes: Aging, thermal fatigue
Preventive: NDT.
Expert tips
- 💡 6K98MC-C8: a mechanical record engine. Every inspection is a major event — plan the schedule realistically.
- 💡 Many K98MC-C engines have been retrofitted to K98ME-C — check whether the conversion has taken place.
- 💡 NDT at 980 mm is not optional — it is a regulatory and safety obligation.
- 💡 Indicator diagrams are the only complete diagnostic tool for the MC version.
Related components
Camshaft — largest in the world (mechanical)
Engine block/tie rods — NDT
Turbocharger (3-4 units)
Piston cooling oil system
Fuel separators
Classification & regulatory
IMO Tier I/II. EEXI — EPL on all ships. CII.
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
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
True
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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 #38224
· ✓ still in production