L28/32H

Common issues

• Cylinder liner wear and scuffing, often due to poor lubrication or fuel quality.
• Fuel injector nozzle fouling or failure, leading to poor combustion and increased exhaust temperatures.
• Exhaust valve burning or seat recession, particularly with high exhaust gas temperatures or poor fuel quality.
• Main and big end bearing wear, indicated by increased clearances or abnormal oil analysis results.
• Turbocharger bearing wear or fouling, leading to reduced engine performance and increased exhaust back pressure.
• Cooling water system leaks or blockages, affecting engine thermal management.
• Lubricating oil degradation or contamination, impacting engine component lifespan.
• Control system sensor failures (e.g., PT100, pressure transducers) causing false alarms or operational issues.

Inspection checklist

• Visual inspection for oil, fuel, water, and exhaust gas leaks around the engine block, piping, and turbocharger.
• Check engine room cleanliness, bilge condition, and proper stowage of tools/spares.
• Verify all local and remote gauge readings (pressures, temperatures) are within normal operating parameters and compare with alarm limits.
• Review engine alarm and event logs for recurring issues or recent critical alarms.
• Inspect fuel oil system (filters, pumps, high-pressure lines) for leaks, proper securing, and cleanliness.
• Check lubricating oil system (filters, cooler, sump level) and review latest oil analysis reports for wear metals, TBN, and viscosity.
• Examine cooling water system (expansion tank level, cooler condition, filter cleanliness) and check for signs of corrosion or leaks.
• Inspect turbocharger for excessive axial/radial play, air filter condition, and signs of compressor/turbine fouling.
• Verify proper functioning of safety devices: overspeed trip, low lube oil pressure shutdown, high cooling water temperature shutdown, and crankcase oil mist detector.
• Check exhaust manifold insulation integrity and look for signs of hot spots or leaks.

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 unit (or nozzle + plunger/barrel set)
• Full set of fuel filter elements (primary and secondary)
• Full set of lubricating oil filter elements
• Assortment of O-rings and gaskets for common leak points (e.g., cylinder head cover, fuel pump)
• Critical sensors (e.g., PT100 for exhaust gas, pressure transducer for lube oil/fuel)
• Inlet and exhaust valve springs
• Starting air valve repair kit
• Turbocharger bearing cartridge or repair kit (depending on turbocharger type and maintenance strategy)

Safety

• High-pressure fuel leaks: Risk of fire due to atomized fuel spraying onto hot surfaces. Ensure double-walled pipes are intact and leak detection systems are functional.
• Hot surfaces: Exhaust manifold, turbocharger, and other engine components operate at high temperatures. Ensure insulation is intact and warning signs are present.
• Rotating machinery: Exposed rotating parts (flywheel, coupling, shaft ends) pose entanglement hazards. Ensure guards are in place.
• Crankcase explosion: Risk of crankcase explosion due to hot spots or bearing failures. Ensure crankcase oil mist detector is operational and relief doors are clear.
• Starting air system: High-pressure air can cause severe injury. Ensure safety valves are functional and proper procedures are followed during maintenance.

Class survey

Class surveyors will typically focus on verifying the engine's overall condition, maintenance history, and the functionality of critical safety systems. Key checks include: review of maintenance records, lube oil analysis reports, and alarm logs; verification of overspeed trip, low lube oil pressure shutdown, and high cooling water temperature shutdown; inspection of crankcase oil mist detector; periodic crankshaft deflection measurements; and scheduled opening-up inspections of main/big end bearings, cylinder heads, and pistons as per class requirements (e.g., 5-year cycle for main bearings, 10-year for some piston withdrawals). They will also check for fuel system integrity, exhaust system leaks, and general engine room housekeeping and fire prevention measures.

Estimated lifetime: 24000-36000 hours before major overhaul (e.g., full piston/liner/bearing renewal cycle). Total engine life can exceed 100,000 hours with diligent maintenance.