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MAN Energy Solutions
8K98MC-C8
The MAN 8K98MC-C8 is a high‑power, eight‑cylinder, low‑speed two‑stroke diesel main engine delivering up to 113 MW at 97 rpm, distinguished by camshaft‑controlled fuel injection and exhaust valves with constant‑pressure turbocharging.
113360.0 kW
Power
Engine Specifications
8
Cylinders
980 mm
Bore
2400 mm
Stroke
113,360 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
8 stands for 8 cylinders, K for Short-Stroke (Kurzhub), 98 for 980 mm bore, MC-C for the MAN B&W MC-Compact series, 8 for Mark 8.
Background
The K98MC-C8 with 8 cylinders is the most powerful conventional 2-stroke engine in the MC/MC-C series. 980 mm bore at S/B 2.45 in 8-cylinder configuration — propulsion for the world's largest container ships (ULCS 18,000+ TEU). Mark 8 as the final conventional evolution before the ME-C series.
Calculated metrics
Stroke To Bore Ratio
2.449
Inspector checklist
Running Gear & Tribology
- Cylinder liners: 980 mm bore — largest running surface, wear measurement at a minimum of 12 positions, document ovality trend
- Piston rings: S/B 2.45 — low ratio, watch for ring flutter and blow-by, measure ring groove clearance
- Piston crown: NDT for crack formation recommended at every piston withdrawal
Crosshead & Stuffing Box
- Crosshead bearing: massive dimensions — close monitoring of temperature and oil supply
- Stuffing box: large piston rod dimensions — document drainage trend
- Piston rod: deflection at all 8 throws
Control & Hydraulics
- Camshaft drive: extreme drive forces at 8×K98 — chain condition critical
- Exhaust valve: largest valve dimensions — hydraulics and seat on all 8 cylinders
- Fuel injection pumps: high injection quantities — nozzle condition critical
Scavenge Air & Exhaust System
- Scavenge air receiver: fully walk-in — inspect all 8 ports systematically
- Turbocharger: 3-TC configuration — check all units and compare running hours
- Exhaust gas economiser: soot fire risk at part load
Cooling System
- Piston cooling: extreme heat loading at 980 mm — flow rate and temperature at each cylinder
- Bore cooling: blockages can cause local overheating
- Cylinder cover NDT for thermal cracks
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Exhaust gas temperature per cylinder | 330–400 °C at MCR | spread >15 °C → investigate immediately |
| Scavenge air pressure | 3.0–3.8 bar | drop → check TC |
| Pmax | ±3 bar cylinder balance | deviation → timing/compression |
| Crosshead bearing temperature | 55–65 °C | rise >3 °C → investigate immediately |
| Piston cooling oil temperature differential | Δt 15–25 °C | individual cylinder deviation → check cooling bore |
Common Failure Modes
Cylinder cover crack formation
Symptoms: cooling water in the combustion chamber, white steam, cooling water loss
Causes: extreme thermal loading at 980 mm bore, fatigue, scale deposits
Preventive: NDT every 16,000 operating hours, monitor cooling water treatment
Piston ring flutter at low S/B
Symptoms: irregular blow-by, ring breakage, increased oil consumption
Causes: S/B 2.45 favours ring instability, ring groove wear, insufficient ring tension
Preventive: ring configuration per current MAN service letter, check ring groove clearance at every piston withdrawal
Camshaft drive failure
Symptoms: timing deviations, noise, in extreme cases chain breakage
Causes: extreme drive forces at 8×K98, chain elongation, material fatigue
Preventive: inspect chain box every 12,000 operating hours, measure chain elongation
Expert tips
- 💡 8×K98MC-C8 is the most powerful engine of the conventional MC/MC-C series — do not underestimate the sheer size during inspection: a liner weighs >8 t, a piston >5 t, a cylinder cover >25 t
- 💡 At S/B 2.45: ring flutter is the K98's specific risk — be sure to implement the current MAN service letters on optimised ring configuration
- 💡 The 8-cylinder K98 engines are fitted almost exclusively in ULCS — slow steaming at <50% MCR is standard, auxiliary blower automation and TC cut-out must function reliably
Related components
Turbocharger (3-TC — all units)
Scavenge air cooler
Exhaust gas economiser
Shaft line and thrust bearing
Foundation bolts and double bottom
Auxiliary blowers
Fuel treatment
Classification & regulatory
IMO Tier I as Mark 8. Combustion optimisation or EGR/SCR required for Tier II. EEDI Phase 2/3 critical on ULCS — derating or dual-fuel conversion as options. MARPOL Annex VI — scrubber retrofit standard on ULCS.
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
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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 #38261
· ✓ still in production