5X35-B
The WinGD X35‑B is a five‑cylinder low‑speed two‑stroke marine diesel engine delivering up to 4 700 kW at 167 rpm, featuring electronic common‑rail fuel injection and the WiDE control system for precise operation.
Engine Specifications
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Designation decoded
WinGD 5X35-B – 5-Zylinder-Reihenmotor, X-Serie, 35 = 350 mm Bohrung, B = zweite Generation (verbesserte Variante). Zweitakt-Kreuzkopf-Dieselmotor mit vollelektronischer Steuerung (nockenwellenlos). 350 mm Bohrung, 1550 mm Hub, 5 Zylinder.
Background
The WinGD X35-B is the improved second generation of the X35. The B variant offers optimizations in combustion chamber design, injection strategy, turbocharger tuning and control software. Compared to the basic X35 model, the B version is characterized by reduced specific fuel consumption, improved part-load behavior and extended Delta Tuning capabilities. The basic architecture remains identical: fully electronic control via UNIC, Common Rail injection (W-FIS), hydraulic exhaust valve control (W-EVC), Pulse Lubrication System. FlexCam profiles are further optimized. The 5-cylinder configuration continues to require particular attention to torsional vibrations. Suitable for small commercial vessels, feeder container ships and coastal motor ships.
Calculated metrics
Inspector checklist
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Zünddrücke (Pmax) aller 5 Zylinder | Pmax-Abweichung ≤ ±2 bar zwischen Zylindern | On B variant with optimized control, even minor deviations indicate injector or sensor problems |
| Exhaust gas temperatures per cylinder | 340–420 °C at rated load (B variant tends toward lower end) | B-Variante sollte gleichmässigere Temperaturen zeigen; Asymmetrien deuten auf Hardware-Degradation hin |
| Common-Rail-Druck (W-FIS) | 800–1000 bar (lastabhängig) | Pressure drop indicates injector leakage, pump wear or valve malfunction |
| Spezifischer Kraftstoffverbrauch (SFOC) | Gemäss WinGD-Testbed-Werten für X35-B (typ. Verbesserung von 2-3 g/kWh gegenüber X35) | Increased SFOC indicates combustion deterioration, injector aging or incorrect Delta Tuning parameters |
| Spülluftdruck | 1.5–3.0 bar abs. (lastabhängig) | Excessively low pressure indicates turbocharger or charge air cooler problems |
| Zylinderöl-Verbrauch | 0.5–1.0 g/kWh (Pulse Lubrication optimiert) | Deviations from B-variant setpoint indicate system or oil quality problems |
Common Failure Modes
Expert tips
- 💡 On B-variant inspection always verify the UNIC system software version against the approved status – B variant requires specific software releases that are not backward compatible with the basic X35
- 💡 Delta Tuning parameters must match the actual operational profile – a motor optimized for slow steaming that is regularly operated at rated load can show increased wear
Related components
Classification & regulatory
IMO Tier II Standard. Tier III via iCER or SCR catalyst. NOx Technical File must contain B-variant-specific parameters. UNIC software version must match EIAPP certificate. Upon Delta Tuning activation: extended operating approval from the classification society required.
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
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Common failures & inspection points
Visual inspection of liner for scratches, micro-welding and discoloration; check local surface roughness; hone liner or replace if necessary
Use thickness gauge (e.g. Fischer Dualscope MP0); compare with reference values from OM; inspect piston crown for thermal discoloration, cracks and deposits
Check fuel pressure during operation (reference value at R1); monitor fuel return for leaks; observe inspection lines at injectors for leaks
Perform continuous exhaust temperature monitoring per cylinder; initiate cylinder head inspections at temperature differences >30°C; check gas concentration in piston
Monitor servo oil pressure and flow; visually inspect all fuel lines and valve connections and under pressure; monitor sight glasses
Type-general inspection and maintenance points for this equipment category — not model-specific.
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