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WinGD

7X72-B

Name: WinGD 7X72-B
Brand: WinGD
SKU: OSE-38754

The WinGD 7X72‑B is a 7‑cylinder, low‑speed, reversible 2‑stroke main engine delivering up to 27 MW at 85 rpm, notable for its wide power‑speed field and flexible fuel capability (diesel/HFO and alternative fuels via DF variants).

27090.0 kW

Power

Engine Specifications

Cylinders

720 mm

Bore

3086 mm

Stroke

27,090 kW

MCR Power

85.0 rpm

MCR RPM

2-stroke

Stroke Type

Family: WIN-GD X · Tier: IMO Tier II · Fuel: HFO, VLSFO, MDO

Inspector Detail ✓ verified

▸

Designation decoded

WinGD 7X72-B – 7-cylinder, electronically controlled two-stroke slow-speed engine, bore 720 mm, stroke 3,086 mm, B-version (optimized). Camshaft-less drive with improved UNIC, Common Rail, FlexCam, optimized Delta Tuning and iCER capability.

Background

The X72-B is the optimized variant of the X72 with improved fuel efficiency, extended Delta Tuning algorithms and improved diagnostic functions in the UNIC system. The B-version offers better part-load performance for slow-steaming operation and optimized combustion control. FlexCam and Common Rail operate with refined control parameters. iCER is available as a Tier III solution. At 7 cylinders, the torsional vibration issue remains.

Calculated metrics

Stroke To Bore Ratio

4.286

Inspector checklist

Logbook reference values

Parameter	Expected	Deviation means
Common-Rail-Druck	800–1000 bar (lastabhängig)	Leakage or pump performance loss
Servo-Öldruck	200–250 bar	FlexCam and exhaust valve control impaired
pmax-Gleichmäßigkeit	≤ 5 bar Abweichung zwischen Zylindern	Verbrennungsungleichmäßigkeit; systematische Ursachenanalyse erforderlich
Delta-Tuning-Betriebsmodus	Passend zum Lastprofil eingestellt	Wrong mode: unnecessary consumption or increased emissions/thermal stress
Abgastemperaturen	± 20 °C vom Mittelwert	Einzelabweichung: Zylinder-spezifische Störung
Torsionsschwingungspegel	Innerhalb Klasse-genehmigter Grenzwerte	Überschreitung erfordert sofortige Betriebseinschränkung
Liner wear	< 0,05 mm/1000 Bh	Increased wear: evaluate lubrication and fuel quality
Kolbenring-Gasspalt	According to manufacturer table for operating hours	Überschreitung: Ringwechsel einplanen; Laufbuchsenzustand parallel bewerten

Common Failure Modes

Delta-Tuning-Fehlanpassung

Symptoms: ['Übermäßiger Kraftstoffverbrauch', 'Elevated exhaust gas temperatures at part load', 'NOx-Werte außerhalb Spezifikation']

Causes: Tuning mode not adapted to changed operating profile, UNIC-Softwareversion veraltet, Fehlerhafte Sensorwerte führen zu falscher Regelung

Preventive: Align Delta Tuning mode at every inspection with current operating profile; keep UNIC software current; check sensor calibration

Bore Polishing der Laufbuchsen

Symptoms: ['Erhöhter Schmierölverbrauch', 'Glatte, spiegelnde Bereiche auf der Laufbuchsenoberfläche', 'Verschlechterung der Kolbenring-Abdichtung']

Causes: Langzeit-Teillastbetrieb (Slow Steaming), Zu niedrige Zylinderschmierölrate, Kraftstoffqualität mit hohem Katalysatorfines-Anteil

Preventive: Zylinderschmierölrate an Teillastbetrieb anpassen; regelmäßige Laufbuchsen-Inspektion; Honing-Muster überwachen

Auslassventil-Ermüdungsbruch

Symptoms: ['Plötzlicher Kompressionsverlust', 'Abgasaustritt am Ventilgehäuse', 'Erhöhte Partikelemissionen']

Causes: Hochzyklische thermische Belastung, Material fatigue after exceeding service life, Hot corrosion from fuel

Preventive: Replace valve spindles according to manufacturer interval; NDT at inspections; verify valve rotation

Torsionsdämpfer-Silikonöl-Degradation

Symptoms: ['Erhöhte Torsionsschwingungsamplituden', 'Dämpfergehäuse-Temperaturanstieg', 'Schwingungsmonitoring zeigt Trendverschlechterung']

Causes: Alterung des Silikonöls über Betriebsjahre, Thermal overload during frequent operation near barred speed range, Inadequate maintenance

Preventive: Silikonöl gemäß Herstellerintervall (typ. 4–6 Jahre) wechseln; Barred Speed Range konsequent einhalten

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Related components

T u r b o c h a r g e r , c h a r g e a i r c o o l e r , f u e l t r e a t m e n t , s e r v o o i l s y s t e m , i C E R c o m p o n e n t s , c y l i n d e r p r e s s u r e s e n s o r s , c r a n k s h a f t a n d c r o s s h e a d b e a r i n g s , t o r s i o n a l d a m p e r , s h a f t l i n e , p r o p e l l e r s h a f t ( v i b r a t i o n t r a n s m i s s i o n )

Classification & regulatory

MARPOL Annex VI Tier II/III: Delta Tuning and iCER must be documented in the NOx Technical File. Check EIAPP certificate for validity. Observe IACS UR M68 for torsional vibrations in 7-cylinder arrangement. For iCER: demonstrate Tier III compliance in ECA areas. Consider classification society special requirements for crankshafts of large engines.

Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.

Other Cylinder Configurations 50

Components & Design

Component data being added…

Technical Data

Stroke/Bore Ratio 4.29

MEP X72 Diesel R1 20.5 bar

MEP X72DF Standard R1 17.3 bar

MEP X72DF-1.2 R1 15.7 bar

BSFC X72 Diesel 167 g/kWh at full power (Tier II)

BSFC X72DF-A-1.0 Diesel 168.8 g/kWh at 89 rpm, 8 cyl

Gas Consumption X72DF-A-1.0 Ammonia 368.1 g/kWh at max rating

Power per Cylinder X72DF-2.1 3,225 kW/cyl at 89 rpm

Injection System Common Rail, electronic control

Engine Type Camshaftless 2-stroke, reversible, low-speed

unified from engine model True

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Common failures & inspection points

Fuel Rail Pressure Too High causing violent firing at start; fuel control failure

Verify fuel rail pressure within spec; check power supply and wiring to fuel control

www.manualslib.com/manual/2884144/W...

Injection Nozzle Wear from normal operation causing irregular combustion

Inspect nozzle tips at ~8,000–10,000 operating hours; replace spare kit per schedule

www.manualslib.com/manual/2884144/W...

Lubricating Oil Contamination: water and solids reduce bearing protection; dry sump circulation critical

Verify centrifugal separator bypass operation; monitor oil condition via sampling; check crankcase drain integrity

www.manualslib.com/manual/2034972/W...

Ammonia Combustion Instability (X72DF-A-1.0): low flame speed, high activation energy, misfiring risk, N2O/NH3 emissions

Monitor cylinder pressure diagrams; verify pilot fuel injection timing/quantity; track exhaust temps and emission compliance

wingd.com/media/2gyl3j0v/wingd-ammo...

Scavenge Air Cooler Fouling in dust-laden trades; efficiency loss and thermal stress

Install filtration for dust-prone routes; schedule periodic cooler inspection and cleaning; monitor scavenge air temperature trend

wingd.com/products-solutions/emissi...

Type-general inspection and maintenance points for this equipment category — not model-specific.

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Equipment Model #38754 · ✓ still in production