16W32

Common issues

• Piston ring wear and peeling, particularly with chrome-ceramic rings under continuous low-load operation.
• Exhaust valve burning and seat wear, especially when operating on HFO with varying fuel quality or improper valve rotation.
• Common Rail injector nozzle coking, wear, and potential issues with high-pressure pump elements or pressure sensors.
• Turbocharger bearing wear (axial and radial play) and fouling of compressor/turbine blades.
• Cylinder liner wear, especially at the top dead center (TDC) due to corrosive and abrasive wear.
• Main and connecting rod bearing wear, often linked to lube oil degradation, contamination, or insufficient filtration.

Inspection checklist

• Verify exhaust gas temperatures per cylinder for balance and check turbocharger inlet/outlet temperatures for signs of fouling or imbalance.
• Inspect Common Rail system components (injectors, high-pressure lines, pumps) for leaks, damage, and signs of coking or corrosion.
• Check crankcase for abnormal oil mist, bearing temperatures (if monitored), and general cleanliness. Ensure crankcase relief valves are clear.
• Perform visual inspection for fuel, lube oil, and cooling water leaks from engine block, piping, and associated components.
• Inspect turbocharger for excessive bearing play (axial/radial), compressor/turbine fouling, and signs of surging or unusual noise.
• Check cylinder unit indicator cock blow-by and visually inspect cylinder head components (valve rotators, rocker arms, pushrods) for proper function and wear.
• Verify functionality of all engine safety devices, including overspeed trip, low lube oil pressure shutdown, and high cooling water temperature alarm.
• Monitor fuel and lube oil filter differential pressures for signs of clogging, indicating potential issues with fuel or lube oil quality/system.

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 tips and associated seals) for at least one cylinder.
• Exhaust Valve Spindle and Seat Ring.
• Full set of Piston Rings for at least one cylinder.
• Connecting Rod Bearing shells (one complete set).
• Assorted Gaskets and O-rings for cylinder head, fuel system, and critical pipe connections.
• Turbocharger bearing cartridge or complete bearing assembly.
• Fuel and Lube Oil Filter elements (sufficient quantity for multiple changes).
• Crankcase relief valve diaphragm/spring or complete unit.

Safety

• Risk of crankcase explosion due to oil mist accumulation; ensure oil mist detector and relief valves are regularly tested and functional.
• High-pressure fuel leaks from Common Rail system components (injectors, pipes) posing a severe fire hazard due to atomized fuel.
• Hot surfaces (exhaust manifold, turbocharger, engine block) requiring proper insulation and guarding to prevent burns.
• Rotating machinery hazards (flywheel, shaft couplings, turbocharger) necessitating guards and strict lockout/tagout procedures during maintenance.
• Potential for engine runaway or overspeed if governor or fuel control system fails, requiring robust overspeed protection.

Class survey

Class surveyors typically verify maintenance records and PMS compliance. They witness engine performance parameters (power, RPM, temperatures, pressures) and test safety devices (overspeed trip, low LO pressure, high CW temp, oil mist detector). During Special Surveys, they require opening of selected cylinder units (piston, liner, valves), main bearings, and connecting rod bearings for inspection and measurement. Fuel, lube oil, and cooling water systems, including filters, coolers, and pumps, are thoroughly inspected for integrity and leaks. Turbocharger and exhaust gas system condition are also checked. Compliance with MARPOL regulations (e.g., NOx technical file, fuel oil treatment) is verified.

Estimated lifetime: 50,000 - 80,000 running hours before major overhaul (e.g., crankshaft inspection/removal)