X72-B
The WinGD X72‑B is a low‑speed, camshaft‑less 2‑stroke main engine delivering up to ~20 MW per cylinder, notable for its high power density and ability to run on conventional heavy fuel oil as well as alternative fuels such as LNG, methanol or ammonia.
Engine Specifications
Inspector Detail
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Designation decoded
X stands for WinGD Generation X, 72 for 720 mm bore, B for compact design.
Background
The WinGD X72-B is a large two-stroke slow-speed engine with 720 mm bore for large bulkers (Capesize), tankers (Suezmax/VLCC) and post-Panamax container vessels. The 720 mm bore competes directly with the MAN S70ME-C (700 mm). The X72 is a high-volume model in WinGD's portfolio.
Calculated metrics
Inspector checklist
- Cylinder liners: 720 mm bore — high thermal loading. Scavenge port inspection every 4,000 h
- Piston rings: WinGD configuration, butt clearances at 720 mm long ring circumferences
- Crosshead bearings: Significant piston mass at 720 mm — temperature monitoring, BWMS
- Common rail: Rail pressure, high-pressure pumps — high throughput at 720 mm
- W.I.S.E.: Software, diagnostic data
- Injection valves: Nozzle condition, spray pattern
- Exhaust valve: Hydraulic actuation, lift, rotation
- Fine filter upstream of rail: Catfines protection at high throughput
- Purifier capacity
- Fuel preheating
- Stuffing boxes: Large piston rod at 720 mm, drainage
- Exhaust valve: Valve seat, rotation
- Scavenge air receiver: Drainage, fire risk
- Crankshaft deflection: Measure regularly
- Main bearings: Bearing clearances, oil temperatures
- Holding-down bolts: Ultrasonic pre-tension check at docking
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Exhaust gas temperature after cylinder | 340-410°C at MCR | >20°C spread → injection problem |
| Common-rail pressure | 800-1000 bar | Drop → pump or rail |
| Pmax per cylinder | Per shop test ±3 bar | Spread >5 bar |
| Scavenge air pressure | 3.0-3.6 bar abs at MCR | Too low → turbocharger |
| Cylinder oil feed rate | 0.7-1.0 g/kWh | Adjust to BN |
| Crankshaft deflection | Per WinGD X72 table | Exceedance → bedplate or bearings |
Common Failure Modes
Expert tips
- 💡 X72-B vs. MAN S70ME-C: Similar power segment, but 720 vs. 700 mm bore — parts are NOT interchangeable, and reference values also differ
- 💡 Common rail at 720 mm: High fuel throughput means higher loading of the high-pressure pumps — check pump redundancy and spare parts availability
- 💡 WinGD licensed builders can vary in manufacturing quality — identify the specific licensed builder when problems occur
Related components
Classification & regulatory
IMO Tier II. Tier III with SCR/EGR. EEDI Phase 2/3.
Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.
Components & Design
Component data being added…
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.
Service & Maintenance
Follow WinGD PMS. Review scavenge inspections and drain-oil results before planning piston pull and liner honing.
Suppliers & Spare Parts
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Manuals
- datasheet
- project_guide