6L6EY22AL

Common issues

• Turbocharger wear and failures due to contaminated oil or carbon deposits, leading to reduced efficiency and smoke under load.
• Fuel injector fouling or malfunction, causing poor combustion, increased exhaust temperatures, and potential cylinder overload.
• Exhaust valve burning or seat wear, resulting in loss of compression, increased fuel consumption, and potential damage to cylinder components.
• Piston ring sticking or excessive wear, leading to increased blow-by, high lube oil consumption, and reduced power output.
• Main and crankpin bearing wear due to lube oil contamination, insufficient oil film, or misalignment, potentially causing severe engine damage.
• Cooling water system blockages, leaks, or corrosion in heat exchangers, leading to inadequate cooling and engine overheating.
• Governor or fuel rack linkage issues, causing unstable RPM, load fluctuations, or difficulty in maintaining desired engine speed.

Inspection checklist

• Visual inspection for any leaks (fuel, lube oil, cooling water, exhaust gas) around the engine and associated piping.
• Check turbocharger for unusual noises, excessive axial/radial play, and cleanliness of compressor and turbine sides.
• Monitor exhaust gas temperatures for each cylinder to identify imbalances, indicating potential combustion issues or injector problems.
• Measure crankcase pressure and observe blow-by for signs of excessive piston ring wear or liner damage.
• Inspect lube oil condition (level, appearance in sight glass) and review recent lab analysis reports for contamination or degradation.
• Verify fuel system components (filters, pumps, injectors) for leaks, proper function, and cleanliness.
• Check cooling water system pressure, temperature, and expansion tank level; inspect heat exchangers for signs of fouling or corrosion.
• Listen for unusual engine noises or vibrations, which could indicate bearing wear, combustion issues, or component looseness.
• Inspect governor linkage for freedom of movement, proper lubrication, and absence of excessive play.
• Verify the functionality of engine safety devices (overspeed trip, low lube oil pressure shutdown, high cooling water temperature alarm/shutdown) through test records or direct testing if permitted.

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 Nozzles (at least one set per cylinder)
• Fuel Pump Elements (HP pump plungers and barrels)
• Full set of Lube Oil and Fuel Filters
• Piston Rings (at least for one cylinder)
• Exhaust Valve Spindle and Seat (one set)
• Assorted Gaskets and O-rings for common maintenance points
• Turbocharger Bearing Cartridge
• High-Pressure Fuel Pipes (one set)

Safety

• High-pressure fuel leaks pose a severe fire hazard; ensure all fuel lines are properly secured and free from damage.
• Hot surfaces (exhaust manifold, turbocharger, uninsulated pipes) present a burn risk; ensure proper lagging and warning signs.
• Rotating machinery (flywheel, coupling, shafting) can cause entanglement injuries; ensure guards are in place and proper lockout/tagout procedures are followed during maintenance.
• Potential for crankcase explosions due to oil mist ignition; ensure crankcase relief valves are functional and regular crankcase inspections are performed.
• High noise levels in the engine room can cause hearing damage; ensure hearing protection is worn and noise abatement measures are maintained.

Class survey

Class surveyors typically focus on reviewing engine logbooks for running hours, maintenance history, and performance data (exhaust temperatures, pressures, fuel/lube oil consumption). They will verify the functionality of all engine safety devices (overspeed trip, low lube oil pressure, high cooling water temperature) and emergency stops. Crankshaft deflection readings are often required. The integrity of the fuel oil system, including high-pressure pipes, leak-off arrangements, and fire fighting provisions, is thoroughly checked. General engine room cleanliness, securing of machinery, and condition of auxiliary systems (pumps, coolers, filters) are also assessed. Crankcase relief valves and their flame arrestors will be inspected.