8X82-B

Common issues

• Fuel injection valve dripping/leakage causing after-burning and exhaust valve or piston crown damage
• Exhaust valve spindle and seat burning or wear from poor sealing or fuel quality issues
• Cylinder liner and piston ring scuffing, particularly at low load or with an incorrect cylinder lubrication feed rate
• Scavenge space oil/soot deposits - a recognised scavenge fire risk if not kept clean
• Turbocharger fouling on the gas and air side reducing scavenge pressure
• Crosshead and main bearing wear or wiping if lubricating oil quality or clearance is out of tolerance
• Piston rod stuffing box wear allowing oil migration into the scavenge space

Inspection checklist

• Measure cylinder liner wear (bore gauge) at scheduled piston/liner overhaul
• Inspect exhaust valve spindle and seat condition, check valve rotation
• Function-test fuel injection valves for spray pattern and leak-off
• Check crosshead and main bearing clearances against maker's tolerance
• Inspect scavenge space for oil/soot accumulation (fire risk) at each opening
• Inspect turbocharger compressor and turbine blades and clean per condition
• Check crankcase for signs of oil mist/hot spots; verify explosion relief door condition
• Check hydraulic system pressure/condition for exhaust valve actuation and fuel injection

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 injection valves
• Exhaust valve spindle and seat
• Piston ring set
• Cylinder liner
• Crosshead bearing shells
• Main bearing shells
• Turbocharger nozzle ring / cartridge

Safety

• Crankcase explosion risk from oil mist - crankcase doors, explosion relief valves, and oil mist detectors must be maintained and tested
• Scavenge space fire risk from oil/soot accumulation - keep clean and monitor scavenge drain temperatures
• The electronically controlled fuel/hydraulic system remains pressurised - follow lock-out procedure before maintenance
• Hydraulic accumulators for exhaust valve actuation store energy - depressurise before maintenance
• Hot exhaust manifold and turbocharger surfaces
• Working at height and with heavy components (piston, liner) during overhaul

Class survey

Main propulsion 2-stroke engines are typically enrolled in Continuous Survey Machinery (CSM); class will expect crankshaft deflection records, cylinder condition reports (liner wear, piston ring/groove condition), turbocharger overhaul records, and crankcase explosion relief/oil mist detector function tests.