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WinGD
7X52DF
The WinGD 7X52DF is a 7‑cylinder, low‑speed (105 rpm) two‑stroke dual‑fuel main engine delivering up to 13 160 kW, capable of running on diesel oil or low‑pressure LNG without a high‑pressure gas compressor.
13160.0 kW
Power
Engine Specifications
7
Cylinders
520 mm
Bore
2315 mm
Stroke
13,160 kW
MCR Power
118.0 rpm
MCR RPM
2-stroke
Stroke Type
Family: WIN-GD X-DF
· Tier: IMO Tier III (gas mode)
· Fuel: HFO, VLSFO, MDO, LNG
Other Cylinder Configurations 33
5X35DF
5 cyl
· 4,200 kW
5X40DF
5 cyl
· 5,300 kW
5X52DF
5 cyl
· 9,400 kW
5X62DF
5 cyl
· 13,400 kW
5X72DF
5 cyl
· 18,300 kW
5X82-DF
5 cyl
· 23,050 kW
5X92DF
5 cyl
· 31,950 kW
6X35-DF
6 cyl
· 5,040 kW
6X40DF
6 cyl
· 6,360 kW
6X52DF
6 cyl
· 11,280 kW
6X62DF
6 cyl
· 16,080 kW
6X72DF
6 cyl
· 21,960 kW
6X82-DF
6 cyl
· 27,660 kW
6X92DF
6 cyl
· 38,340 kW
7X35-DF
7 cyl
· 5,880 kW
7X40DF
7 cyl
· 7,420 kW
7X62DF
7 cyl
· 18,760 kW
7X72DF
7 cyl
· 25,620 kW
7X82DF
7 cyl
· 37,660 kW
7X92DF
7 cyl
· 44,730 kW
8X35-DF
8 cyl
· 6,720 kW
8X40DF
8 cyl
· 8,480 kW
8X52DF
8 cyl
· 15,040 kW
8X62DF
8 cyl
· 21,440 kW
8X72DF
8 cyl
· 29,280 kW
8X82-DF
8 cyl
· 36,880 kW
8X92DF
8 cyl
· 51,120 kW
9X40DF
9 cyl
· 9,540 kW
9X82-DF
9 cyl
· 41,490 kW
9X92DF
9 cyl
· 57,510 kW
10X92DF
10 cyl
· 63,900 kW
11X92DF
11 cyl
· 70,290 kW
12X92DF
12 cyl
· 76,680 kW
Components & Design
Alpha Lubricator Control
WIN-GD / Hans Jensen Lubricators
WIN-GD Pulse Lubrication System
Pulse lubrication for accurate CLO timing. Feed rate adjustable 0.5-1.0 g/kWh. Lower feed on gas mode.
Lead time: 6 wk
20.0 kg
Common Rail Unit (RT-flex / X-DF)
WIN-GD / Winterthur
WIN-GD Common Rail Unit
Rail pressure ~1000 bar (fuel), ~200 bar (servo oil). Monitor rail pressure stability.
Lead time: 16 wk
1800.0 kg
Crankcase Oil Mist Detector
GEA / Schaller Automation
GEA Westfalia OMD / Schaller VN215+
Same as diesel — SOLAS mandatory regardless of fuel. Test weekly.
Lead time: 2 wk
8.0 kg
Cylinder Liner
WIN-GD
WIN-GD X-DF Cylinder Liner
Gas ports machined into liner — inspect for erosion. Wear rate significantly lower in gas mode.
Lead time: 16 wk
3200.0 kg
Dual-Fuel System (Gas Mode)
WIN-GD
WIN-GD X-DF Gas Admission System
Gas admission at 10-16 bar via scavenge ports. Pre-chamber with diesel pilot. Monitor methane slip.
Lead time: 12 wk
350.0 kg
Engine Control Unit (ECU / ECS)
WIN-GD / ABB
WIN-GD WiDE Engine Control System
WiDE = Wartsila Intelligent Diesel Engine. Dual-redundant. iCER optimization requires latest firmware.
Lead time: 8 wk
50.0 kg
Exhaust Valve (& Valve Seat)
WIN-GD
WIN-GD Exhaust Valve (X-DF)
Gas mode extends valve life significantly (less hot corrosion). Overhaul at 16,000 hrs (gas-only: 24,000 hrs).
Lead time: 10 wk
300.0 kg
FGSS (Fuel Gas Supply System - LNG/Methanol)
TGE Marine / Wartsila Gas Solutions
FGSS LNG Supply Module (ME-GI type HP / X-DF type LP)
LP-FGSS for X-DF (6-16 bar). Mandatory gas detection in duct space. Emergency shutdown drill monthly.
Lead time: 26 wk
Fuel Valve (Injector)
WIN-GD
WIN-GD X-DF Fuel Valve (diesel + pilot)
Pilot injector critical for gas mode ignition. Inspect pilot nozzle at 4,000 hrs. Main valve at 8,000 hrs.
Lead time: 6 wk
75.0 kg
Governor (Electronic/Woodward)
Woodward
Woodward 723PLUS / WIN-GD Integrated Governor
Integrated with WiDE. Gas/diesel mode switching requires governor parameter set change.
Lead time: 4 wk
15.0 kg
Hydraulic Power Supply (HPS)
WIN-GD
WIN-GD Flex HPS (Common Rail Servo Oil)
Servo oil system at ~200 bar. Filter changes every 4,000 hrs. Use approved servo oil only.
Lead time: 14 wk
2500.0 kg
Piston Crown
WIN-GD
WIN-GD X-DF Piston Crown
Gas mode reduces thermal loading. Inspect at 16,000-24,000 hrs. Extended intervals possible in gas-only service.
Lead time: 14 wk
1700.0 kg
SCR (Selective Catalytic Reduction)
HUG Engineering / Yara Marine
WIN-GD SCR Reactor (for diesel mode Tier III)
Only needed for Tier III in diesel mode (gas mode is inherently Tier III). SCR bypass in gas mode.
Lead time: 20 wk
12000.0 kg
Scavenge Air Cooler
WIN-GD / Alfa Laval
WIN-GD SAC (Plate/Shell-and-tube)
Cleaner in gas mode — extended cleaning intervals. Monitor charge air temperature after cooler.
Lead time: 14 wk
5000.0 kg
Sensors & Transmitters
WIN-GD / Danfoss / ABB
WIN-GD Sensor Suite (pressure, temp, speed, knock)
Knock detection sensors critical for X-DF gas mode — prevents detonation. Calibrate every 4,000 hrs.
Lead time: 2 wk
2.0 kg
Turbocharger Unit (ABB/MHI/Napier)
ABB Turbocharging
ABB A265-L Turbocharger
Gas mode significantly reduces fouling. Extended TC overhaul interval to 16,000-24,000 hrs in gas mode.
Lead time: 16 wk
8500.0 kg
Technical Data
Stroke/Bore Ratio
4.45 (2315mm stroke), 3.93 (2045mm stroke)
Mean Effective Pressure (MEP)
21 bar (X52), 17.3 bar (X52DF)
BSFC X52 (g/kWh)
169.8 g/kWh at MCR 105 rpm (Tier II/III), 170.8 g/kWh low-load tuning
BSFC X52-S2.0 (g/kWh)
154.2-164.8 g/kWh diesel mode, up to 5 g/kWh reduction vs standard
BSFC X52DF-S2.0 (g/kWh)
140.1 g/kWh gas mode + 1.5 pilot, 181.4 g/kWh diesel mode
BSGC X52DF-A-1.0 (g/kWh)
371.5 g/kWh gas mode ammonia, 170.8 g/kWh diesel mode
Power per cylinder
1810 kW/cyl @ 105 rpm (X52), 1490 kW/cyl @ 105 rpm (X52DF), 1500 kW/cyl @ 120 rpm (X52DF-S2.0), 1910 kW/cyl @ 120 rpm (X52-S2.0)
Emissions Compliance
IMO Tier II/III (SCR), iSCR integrated option available
Gas system type (DF)
Low-pressure gas injection with hydraulic pilot fuel injection
unified from engine model
True
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Common failures & inspection points
Gas Admission Valve (GAV) stroke sensor unreliability at sea causing unplanned diesel mode shutdown
Visual inspection of GAV sensor wiring, sensor response test at dock and sea trial, check sensor connector corrosion
Fuel gas supply pressure fluctuations under heavy sea conditions from ship-side LNG system causing engine speed oscillations
Pressure relief valve setting verification, fuel supply isolation valve function check, regulator response test under load variation
Scavenge air cooler type changes and turbocharger allocation revisions across X-engine platform requiring careful commissioning verification
Cross-check installed turbocharger serial number against commissioning document, scavenge cooler type plate vs contract specifications
Oil starvation risk on turbocharger bearing during engine startup and low-pressure transients common in all two-stroke diesels
Check lube oil supply pressure before start, inspect turbo bearing condition at overhaul, verify pre-lubrication startup sequence in manual
Type-general inspection and maintenance points for this equipment category — not model-specific.
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Equipment Model #38802
· ✓ still in production