S60ME-C8.5

Common issues

• Hydraulic Power Supply (HPS) unit failures (pumps, accumulators, filters) leading to loss of hydraulic pressure for fuel injection and exhaust valve actuation.
• Exhaust valve burning or sticking due to poor combustion, high exhaust temperatures, or issues with valve rotation/actuation.
• Cylinder liner scuffing or high wear rates, often linked to varying fuel quality (e.g., VLSFO), inadequate cylinder lubrication, or cold corrosion.
• Piston ring breakage or sticking, leading to blow-by, increased scavenge space deposits, and reduced compression.
• Fuel valve nozzle choking or dribbling, causing poor atomization, increased fuel consumption, and thermal stress on cylinder components.
• Turbocharger fouling (compressor/turbine side) or bearing wear, resulting in reduced efficiency and high exhaust temperatures.
• Crosshead bearing wear, particularly with prolonged low-load operation or lubrication issues, though less common in modern designs.
• Malfunctions of critical sensors or actuators within the ME-C electronic control system, leading to erratic engine behavior or alarms.

Inspection checklist

• Scavenge space inspection: Check for deposits, signs of fire, condition of drain valves, and general cleanliness.
• HPS unit: Verify hydraulic pressure, oil level, filter differential pressure, and check for leaks from pumps, accumulators, and piping.
• Exhaust valve actuators: Check for oil leaks, smooth operation (if possible during turning), and proper linkage.
• Cylinder unit condition: Listen for abnormal noises, check indicator cock blow-by, inspect cylinder lubricator function and oil distribution.
• Turbocharger: Check bearing axial and radial play (if accessible), inspect compressor and turbine for fouling, and verify air filter condition.
• Fuel oil supply unit (FOS): Check fuel pressure, filter differential pressure, and look for leaks.
• Crankcase inspection: Check for oil mist, water ingress, and general cleanliness (visual from inspection doors).
• Main and crosshead bearing temperatures: Monitor trends and check for any localized hot spots or abnormal sounds.
• Engine control system: Review alarm log, check for active alarms, and verify critical parameter readings against normal operating ranges.
• General leaks and vibrations: Conduct a thorough visual inspection for fuel, lube oil, cooling water, and air leaks. Observe for abnormal vibrations.

Service intervals

Typical wear limits

Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.

Critical spares

• Piston rings (complete set for at least one cylinder)
• Exhaust valve spindle and seat ring (at least one set)
• Fuel valve nozzles (several sets)
• HPS pump cartridge/elements and filter elements
• Turbocharger bearing cartridges and seals
• Cylinder liner (at least one, if not already onboard)
• Assorted O-rings, gaskets, and seals for common maintenance tasks
• Critical sensors (e.g., cylinder exhaust temperature, fuel pressure, HPS pressure)

Safety

• High-pressure fuel and hydraulic oil leaks: Risk of fire and severe injection injuries (pinhole leaks).
• Scavenge fires/crankcase explosions: Requires strict adherence to safety procedures and proper maintenance of relief valves and oil mist detectors.
• Hot surfaces: Exhaust manifold, turbocharger, cylinder covers, and steam/hot water lines pose severe burn hazards.
• Rotating machinery: Flywheel, turning gear, and turbocharger present entanglement and impact risks.
• High voltage and control systems: Electrical hazards during inspection or maintenance of ME-C components.

Class survey

A class surveyor typically checks: 1. **Documentation Review:** Thorough check of engine logbooks, maintenance records, lube oil analysis reports, fuel oil bunkering and analysis reports, and performance data. 2. **Safety Devices:** Verification of overspeed trip, emergency stop, crankcase relief valves, turning gear interlock, and oil mist detector functionality. 3. **Scavenge Space Inspection:** Opening and internal inspection of scavenge spaces for cleanliness, deposits, and signs of fire. 4. **Crankcase Inspection:** If opened, inspection of main and crosshead bearings, connecting rod bolts, and general cleanliness. If not opened, verification of oil mist detector and crankcase pressure. 5. **ME-C System Check:** Functionality of the Hydraulic Power Supply (HPS) unit, exhaust valve actuators, fuel oil supply unit (FOS), and overall engine control system (alarms, parameter stability). 6. **General Condition:** Visual inspection for leaks (fuel, oil, water, air), abnormal vibrations, unusual noises, and overall engine room cleanliness. 7. **Performance Data:** Review of recent engine performance parameters (e.g., cylinder exhaust temperatures, fuel consumption, turbocharger speeds, scavenge pressure) to identify any deviations.