6EY26W

Common issues

• Fuel injector nozzle wear leading to poor atomization, increased fuel consumption, and potential cylinder liner damage.
• Cylinder head valve seat erosion, resulting in loss of compression, increased exhaust temperatures, and potential valve drop.
• Turbocharger bearing wear or fouling, causing reduced boost pressure, surging, and decreased engine efficiency.
• Governor problems, manifesting as unstable engine speed, poor load sharing between generators, or incorrect frequency output.
• Piston ring wear or breakage, leading to increased blow-by, higher lube oil consumption, and reduced compression.
• Lube oil cooler fouling or leakage, impacting lube oil temperature control and potentially contaminating the lube oil system.
• Cooling water system issues such as leaks, pump wear, or heat exchanger fouling, leading to engine overheating.
• Vibration issues due to misalignment, worn couplings, or unbalanced rotating components.

Inspection checklist

• **Visual Inspection (Running & Stopped):** Check for fuel, lube oil, and cooling water leaks. Observe exhaust gas color (should be clear or light haze). Inspect general cleanliness, foundation bolts, and pipework for signs of stress or vibration.
• **Operational Performance:** Monitor engine speed stability, load sharing, and governor response. Check exhaust gas temperatures per cylinder (should be within +/- 30°C of average) and turbocharger boost pressure/speed.
• **Lube Oil System:** Verify lube oil pressure and temperature are within limits. Take samples for analysis (TBN, viscosity, water content, wear metals). Inspect filters for clogging or debris.
• **Fuel System:** Check fuel pressure and temperature. Inspect fuel lines for leaks. Listen for abnormal injector noise. Verify fuel filter condition.
• **Cooling Water System:** Monitor cooling water pressures and temperatures (jacket water, charge air cooler). Check for leaks and proper flow. Inspect expansion tank level.
• **Turbocharger Inspection:** Check for unusual noises or vibrations. Visually inspect compressor and turbine sides for fouling or damage. Check rotor axial and radial play (if engine stopped and cool).
• **Cylinder Head & Valve Gear:** Perform valve clearance checks (cold engine). Listen for abnormal valve train noise. Check for signs of valve rotator malfunction.
• **Safety Devices:** Verify operation of overspeed trip, low lube oil pressure shutdown, high jacket water temperature shutdown, and other critical alarms/trips during routine testing or survey.

Service intervals

Typical wear limits

Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.

Critical spares

• Fuel injector nozzles/elements (complete injectors if budget allows)
• Cylinder head gaskets and O-rings (especially for valve seats)
• Full set of fuel, lube oil, and air filters
• Turbocharger bearing repair kit (cartridge or individual bearings/seals)
• Piston rings (at least one set per cylinder for emergency)
• Valve springs and rotators
• Governor repair kit (if mechanical) or critical electronic components (if electronic)
• Assorted O-rings, gaskets, and seals for common leak points.

Safety

• **High-Pressure Fuel Leaks:** Risk of fire or serious injury from fuel spray. Always inspect high-pressure fuel lines for leaks and ensure spray shields are in place.
• **Hot Surfaces:** Exhaust manifold, turbocharger, and other engine components operate at very high temperatures. Ensure proper insulation and warning signs.
• **Rotating Machinery:** Exposed rotating parts (flywheel, coupling, fan belts) pose entanglement hazards. Ensure all guards are securely fitted.
• **Pressurized Systems:** Cooling water and lube oil systems are under pressure. Exercise caution when opening or draining, especially when hot.
• **Exhaust Gas Leaks:** Risk of carbon monoxide poisoning in enclosed spaces. Regularly inspect exhaust piping for leaks.

Class survey

Class surveyors will typically focus on: **1. Documentation:** Review of engine logbooks, maintenance records, lube oil analysis reports, and spare parts inventory. **2. Operational Checks:** Verification of engine speed control, load sharing, governor response, and proper functioning of safety devices (overspeed, low oil pressure, high temperature shutdowns). **3. Visual Inspection:** Assessment of general engine condition, absence of leaks (fuel, lube oil, cooling water), integrity of foundation bolts, exhaust system, and fuel lines. **4. Specific Checks (during Special Survey):** Crankshaft deflection measurements, spot checks of main and connecting rod bearings (opening inspection covers), cylinder head removal for valve and seat inspection (on selected cylinders), turbocharger inspection, and fuel pump timing verification. **5. Compliance:** Ensuring the engine's operation and maintenance align with IMO Tier II requirements for NOx emissions, as applicable for its build year and flag state.