7L16/24 GenSet

Common issues

• Nozzle fouling and poor atomisation, especially on residual fuel (HFO), leading to incomplete combustion and high exhaust temperatures.
• Exhaust valve burning and seat wear due to poor fuel quality, incorrect fuel heating, or inadequate cooling, often exacerbated by prolonged low-load operation.
• Cooling water leakage at cylinder head joints and O-rings, particularly on aged units, indicating material degradation or improper torque.
• Lube oil contamination (fuel, water, soot) leading to accelerated wear of bearings and liners if not properly managed by separators and filtration.
• Turbocharger bearing wear or fouling, resulting in reduced boost pressure, higher exhaust temperatures, and decreased engine efficiency.
• Abnormal engine vibrations or noise, potentially indicating issues with crankshaft alignment, bearing wear, or combustion imbalances.
• Generator winding insulation degradation or bearing wear, leading to reduced output, increased temperature, or electrical faults.

Inspection checklist

• Visual inspection for fuel, lube oil, and cooling water leaks around the engine block, cylinder heads, and piping.
• Check exhaust gas temperatures (EGT) for each cylinder and at the turbocharger inlet/outlet; look for significant deviations between cylinders.
• Verify fuel oil system parameters: temperature (pre-heater, at engine inlet), pressure, and filter differential pressure.
• Inspect turbocharger for abnormal noise, bearing play (axial/radial), and cleanliness of compressor and turbine sides.
• Monitor lube oil pressure and temperature; check for proper operation of the lube oil separator and filter differential pressure.
• Check cooling water system for proper pressure, temperature, and level; inspect expansion tank for signs of oil contamination.
• Verify generator output parameters (voltage, current, frequency) and check for any abnormal noise or vibration from the generator itself.
• Inspect engine foundation bolts for tightness and signs of movement or corrosion.
• Perform a crankcase inspection (if accessible and safe) for signs of water, metal particles, or abnormal sludge accumulation.
• Review engine logbook for recent alarms, running hours, and maintenance entries.

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 / complete fuel valves
• Exhaust valves and valve seats (or complete cylinder head if unitized)
• Cylinder head gaskets and O-rings (especially for cooling water passages)
• Fuel, lube oil, and air filter elements (full set)
• Piston rings (complete set for at least one cylinder)
• Main and big end bearing shells (at least one set)
• High-pressure fuel pipes (one set)
• Turbocharger cartridge or bearing kit

Safety

• High-pressure fuel spray from leaks can penetrate skin and cause severe injury or ignite, leading to fire.
• Hot surfaces (exhaust manifold, turbocharger, engine block) pose burn hazards; ensure insulation is intact.
• Rotating machinery (crankshaft, flywheel, belts, turbocharger) presents entanglement and crushing risks; ensure guards are in place.
• Electrical hazards from the generator and associated switchgear; always follow LOTO procedures.
• Noise levels can exceed safe limits; hearing protection is mandatory in the engine room.
• Crankcase explosion risk, though rare on smaller engines, requires proper monitoring of crankcase pressure and temperature.

Class survey

Class surveyors typically focus on the overall condition and operational safety. Key checks include: verification of engine safety devices (overspeed trip, low lube oil pressure, high cooling water temperature, low starting air pressure); integrity of fuel oil systems (leakage, fire fighting arrangements, double-walled piping); generator insulation resistance and earth fault detection; condition of foundation bolts; exhaust gas system integrity; and general visual inspection for leaks, corrosion, and abnormal wear. Documentation review of maintenance records, running hours, lube oil analysis reports, and previous survey recommendations is crucial. Crankshaft deflection readings may be requested during major surveys or if abnormal vibrations are reported. A load test of the genset is often required to confirm stable operation and output.

Estimated lifetime: 60,000 - 80,000 hours before major replacement or extensive rebuild