6EY22AW

Common issues

• Exhaust valve burning and seat recession, often exacerbated by HFO operation, incorrect valve clearance, or poor fuel quality.
• Injector coking and nozzle tip wear, leading to poor atomization, increased fuel consumption, and potential cylinder damage. Critical with HFO.
• Turbocharger fouling (gas side) and bearing wear, reducing engine efficiency and increasing exhaust temperatures. Regular washing is key.
• Cylinder liner wear and scuffing, particularly in the top land area, influenced by fuel sulfur content, lube oil quality, and combustion issues.
• Fuel pump element wear and timing issues, affecting fuel injection pressure and timing, leading to uneven cylinder load.
• Cooler fouling (charge air, lube oil, jacket water) reducing heat transfer efficiency and increasing engine operating temperatures.
• Main and connecting rod bearing wear, often due to lube oil contamination, insufficient pressure, or excessive engine vibration.

Inspection checklist

• Visual inspection for fuel, lube oil, and cooling water leaks around the engine, piping, and connections.
• Check exhaust gas temperatures (EGT) per cylinder and at turbocharger inlet/outlet for deviations indicating combustion issues or turbocharger problems.
• Monitor lube oil pressure, temperature, and consumption. Check for signs of water or fuel contamination in the sump.
• Inspect turbocharger for unusual noise, vibration, air filter condition, and signs of oil leakage from bearings.
• Check fuel system pressures (supply, injection) and temperatures. Listen for injector knocking or misfiring.
• Verify proper operation of engine safety devices (overspeed trip, low lube oil pressure, high jacket water temperature, crankcase oil mist detector).
• Inspect cylinder head covers for cleanliness, proper sealing, and any signs of exhaust gas blow-by or fuel leakage.
• Check cooling water system for proper pressure, temperature, and signs of corrosion or leakage.
• Observe engine vibration levels and listen for unusual noises from rotating components (bearings, gears).

Service intervals

Typical wear limits

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

Critical spares

• Complete Fuel Injector units or Nozzle Tips (minimum one set)
• Exhaust Valves and Valve Seats (minimum one set per cylinder)
• Full set of Gaskets and O-rings for cylinder head, fuel pump, and critical pipe connections
• Fuel Filter Elements (primary and secondary), Lube Oil Filter Elements
• Turbocharger Bearing Cartridge or Repair Kit
• Engine Monitoring Sensors (e.g., EGT, pressure, temperature, speed)
• Fuel Pump Elements (plunger and barrel)
• Starting Air Valve (main and pilot)

Safety

• High-pressure fuel lines (especially HFO) are susceptible to leaks, posing fire hazards. Ensure proper shielding and double-wall piping where required.
• Hot surfaces (exhaust manifold, turbocharger, cylinder heads) can cause severe burns. Ensure insulation is intact and personnel are aware.
• Rotating machinery (flywheel, coupling, shaft) poses entanglement risks. Guards must be in place and secured.
• Pressurized systems (starting air, cooling water) can release energy violently if components fail or are improperly handled.
• Crankcase explosions due to oil mist ignition are a risk. Ensure crankcase relief valves are clear and oil mist detector is functional.

Class survey

Class surveyors typically focus on the integrity and operational readiness of safety devices (overspeed trip, low lube oil pressure, high jacket water temperature, crankcase oil mist detector). They will check the condition of high-pressure fuel lines, their shielding, and quick-closing valves. Exhaust system insulation, fire flaps, and general engine room cleanliness are also key. Documentation of maintenance, running hours, lube oil analysis, and fuel oil treatment records are thoroughly reviewed. Operational checks of starting systems, emergency stop, and monitoring of key engine parameters (pressures, temperatures, exhaust gas) are standard. Crankcase relief valve condition and flame arrestors are also inspected.

Estimated lifetime: 30,000 - 60,000 hours before major overhaul (crankshaft out), with a total service life exceeding 100,000 hours with proper maintenance and scheduled overhauls.