5X35-DF

Pulse lubrication for accurate CLO timing. Feed rate adjustable 0.5-1.0 g/kWh. Lower feed on gas mode.

• Lubricator quill blockage
• Timing valve failure
• Feed rate sensor drift
• CLO supply pump failure

Rail pressure ~1000 bar (fuel), ~200 bar (servo oil). Monitor rail pressure stability.

• Fuel rail pressure fluctuation
• Injection control valve (ICV) stiction
• High-pressure accumulator fatigue
• Rail pipe joint leakage

Same as diesel — SOLAS mandatory regardless of fuel. Test weekly.

• Sensor window fouling
• Sample extraction fan failure
• False alarm from crankcase ventilation change in gas mode

Gas ports machined into liner — inspect for erosion. Wear rate significantly lower in gas mode.

• Liner wear (reduced in gas mode)
• Gas port erosion (dual-fuel specific)
• Cold corrosion at low load diesel mode
• Scuffing from CLO under-dosage

Gas admission at 10-16 bar via scavenge ports. Pre-chamber with diesel pilot. Monitor methane slip.

• Gas admission valve (GAV) seal leakage
• Prechamber fouling
• Gas/diesel mode changeover failure
• Methane slip at low load

WiDE = Wartsila Intelligent Diesel Engine. Dual-redundant. iCER optimization requires latest firmware.

• Redundancy switchover failure
• CAN bus communication loss
• Cylinder-individual timing deviation
• Software version mismatch across units

Gas mode extends valve life significantly (less hot corrosion). Overhaul at 16,000 hrs (gas-only: 24,000 hrs).

• Hot corrosion on diesel mode (vanadium attack)
• Valve rotation failure (Rotocap)
• Stem guide wear
• Seat insert loosening

LP-FGSS for X-DF (6-16 bar). Mandatory gas detection in duct space. Emergency shutdown drill monthly.

• BOG compressor trip
• Gas valve train leakage
• Double-wall pipe integrity alarm
• Master gas valve (MGV) failure to close
• Inert gas system malfunction

Pilot injector critical for gas mode ignition. Inspect pilot nozzle at 4,000 hrs. Main valve at 8,000 hrs.

• Pilot nozzle clogging (gas mode soot)
• Main nozzle erosion (diesel mode)
• Needle valve seat wear
• Fuel leak at high-pressure connection

Integrated with WiDE. Gas/diesel mode switching requires governor parameter set change.

• Speed oscillation during mode changeover
• Actuator hunting
• Load sharing instability (dual-fuel transient)

Servo oil system at ~200 bar. Filter changes every 4,000 hrs. Use approved servo oil only.

• Servo oil pump wear
• Accumulator precharge loss
• Servo oil contamination
• Rail pressure instability

Gas mode reduces thermal loading. Inspect at 16,000-24,000 hrs. Extended intervals possible in gas-only service.

• Crown thermal fatigue (less on gas mode)
• Cooling bore blockage
• Crown edge erosion

Only needed for Tier III in diesel mode (gas mode is inherently Tier III). SCR bypass in gas mode.

• Catalyst deactivation from sulfur poisoning (HFO)
• Urea crystallization in piping
• Reactor thermal shock
• Ammonia slip

Cleaner in gas mode — extended cleaning intervals. Monitor charge air temperature after cooler.

• Air side fouling
• Water side corrosion
• Condensate drain choke
• Tube leakage

Knock detection sensors critical for X-DF gas mode — prevents detonation. Calibrate every 4,000 hrs.

• Knock sensor calibration drift (critical for gas mode)
• Exhaust gas temp sensor failure
• Scavenge pressure transmitter error
• Speed pickup contamination

Gas mode significantly reduces fouling. Extended TC overhaul interval to 16,000-24,000 hrs in gas mode.

• Turbine blade erosion (less on gas mode)
• Bearing failure
• Compressor surge at low-load gas mode
• Nozzle ring thermal fatigue