6X72-B
The WinGD 6X72‑B is a low‑speed, two‑stroke marine main engine delivering up to 23 220 kW at 85 rpm, featuring WiDE electronic control and a flexible fuel system for HFO, VLSFO and MDO (with variants for LNG, methanol, ammonia).
Engine Specifications
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Designation decoded
WinGD 6X72-B – 6-Zylinder-Zweitakt-Kreuzkopfmotor, Bohrung 720 mm, Hub 3086 mm, B-Version (verbesserte Variante), vollelektronisch ohne Nockenwelle
Background
The 6X72-B is the optimized B variant of the X72 with improved specific fuel consumption and emission behaviour. Fully camshaft-less control via UNIC system with Common Rail and FlexCam. The B version offers improved combustion chamber design and optimized piston ring configuration. 6-cylinder configuration with good vibration behaviour. Delta Tuning and iCER available.
Calculated metrics
Inspector checklist
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Zünddrücke (Pmax) | Gemäß B-Version Shoptest ±5 bar | Combustion anomaly, injection or compression defect |
| Abgastemperaturen | Innerhalb ±20 °C vom Mittelwert | Cylinder-specific combustion or valve problem |
| Zylinderschmierölverbrauch | 0,5–0,8 g/kWh (B-Version optimiert) | Piston ring or liner wear at exceedance |
| Kompressionsdrücke | Uniform across all cylinders, per manufacturer specification | Piston ring or exhaust valve leakage |
| Charge air pressure and temperature | Lastabhängig gemäß Betriebsanleitung | Turbocharger or cooler degradation |
| Kolbenkühlöl-Austrittstemperatur | Gemäß Herstellervorgabe, keine Einzelabweichung >5 °C | Piston cooling channel clogging or thermal overload |
Common Failure Modes
Expert tips
- 💡 720-mm-B-Version hat striktere Verschleißgrenzen als die Standardversion – immer B-spezifische Herstellerdokumentation verwenden
- 💡 In slow-steaming operation check and document delta-tuning mode – the B-version is more sensitive to misconfiguration
- 💡 Before dry dock analyze liner wear trend – with linear trend forecast remaining service life
Related components
Classification & regulatory
Tier II per MARPOL Annex VI. Tier III via iCER or SCR. B-version offers EEXI benefits through lower specific consumption. CII rating optimization through delta tuning at various operating profiles. Class requirements for cylinder, piston and bearing overhaul observe.
Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.
Other Cylinder Configurations 50
Components & Design
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Technical Data
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Common failures & inspection points
Verify fuel rail pressure within spec; check power supply and wiring to fuel control
Inspect nozzle tips at ~8,000–10,000 operating hours; replace spare kit per schedule
Verify centrifugal separator bypass operation; monitor oil condition via sampling; check crankcase drain integrity
Monitor cylinder pressure diagrams; verify pilot fuel injection timing/quantity; track exhaust temps and emission compliance
Install filtration for dust-prone routes; schedule periodic cooler inspection and cleaning; monitor scavenge air temperature trend
Type-general inspection and maintenance points for this equipment category — not model-specific.
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