6S60ME-C8.5

Common issues

• Fuel valve leakage or poor atomization (due to HFO/VLSFO quality, carbon build-up, or wear), leading to poor combustion and high exhaust temperatures.
• Cylinder liner wear and scuffing, particularly in the upper liner region, exacerbated by varying fuel qualities, slow steaming, or inadequate cylinder lubrication.
• Exhaust valve burning or seat wear, resulting in loss of compression, high exhaust temperatures, and potential damage to the turbocharger.
• Turbocharger fouling (compressor and turbine sides) leading to reduced efficiency, surging, and increased exhaust back pressure.
• Issues with ME-C hydraulic power supply (HPS) system or fuel oil booster (FOB) unit, including pump failures, filter clogging, or control system faults affecting fuel injection and exhaust valve actuation.
• Crosshead bearing wear or damage, often indicated by increased oil consumption, abnormal noise, or elevated temperatures.
• Scavenge space fires due to excessive carbon build-up, oil ingress, or blow-by from worn piston rings/liners.
• Malfunctions of electronic control system components (sensors, actuators, wiring) leading to erratic engine operation or alarms.

Inspection checklist

• **Cylinder Units:** Inspect cylinder heads, exhaust valves, and fuel valves for signs of leakage, carbon build-up, cracks, or overheating. Check indicator cock condition. Perform scavenge port inspection for carbon deposits, oil ingress, and piston ring condition (if accessible).
• **Crankcase:** Visually inspect for oil mist, abnormal leaks, and general cleanliness. Check main and crosshead bearing areas for signs of overheating or distress. Verify oil mist detector functionality.
• **Turbocharger:** Check rotor free play (axial and radial), inspect compressor and turbine blades for fouling or damage. Examine bearing lubrication and cooling lines for leaks. Listen for abnormal noises.
• **Fuel System (HP & LP):** Inspect high-pressure fuel lines, common rail (if applicable), HP fuel pumps, and fuel booster unit for leaks, proper pressure, and filter condition. Check low-pressure system for leaks and filter cleanliness.
• **Lubricating Oil System:** Verify correct lube oil pressure and temperature. Inspect filters for cleanliness. Check sump level and condition of oil. Inspect cylinder lubricator operation and settings.
• **Cooling Water System:** Check for leaks in piping and heat exchangers. Verify correct pressures and temperatures. Inspect expansion tank level and water quality.
• **Control & Safety Systems:** Review engine alarm log for recurring faults. Check functionality of emergency stop, overspeed trip, and other critical safety devices. Verify remote control and local control panel operation. Inspect actuator linkages and sensor connections.
• **Engine Foundation & Mounting:** Inspect all engine foundation bolts for tightness and signs of movement or corrosion. Check chocking arrangements.
• **General Cleanliness & Housekeeping:** Assess overall engine room cleanliness, especially around fuel and lube oil systems, to identify potential fire hazards 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

• Fuel valve complete unit or nozzle tips (at least 1-2 per cylinder)
• Exhaust valve spindle and seat (at least 1 set)
• Piston rings (at least 1 complete set per cylinder, or 1-2 sets for the engine)
• Cylinder liner O-rings and fire rings
• Turbocharger bearing cartridge or complete set of bearings and seals
• Main bearing shells (at least 1 complete set)
• Crosshead bearing shells (at least 1 complete set)
• Assorted O-rings, gaskets, and seals for critical systems (fuel, lube oil, cooling water)
• Critical sensors and actuators for the ME-C control system (e.g., pressure sensors, position sensors, solenoid valves)

Safety

• **Crankcase Explosions:** Risk from oil mist ignition due to hot spots (e.g., bearing failure) or blow-by. Ensure oil mist detector is functional and crankcase relief valves are clear.
• **High-Pressure Fuel Leaks:** ME-C engines operate with very high fuel pressures. Leaks can create fine spray, posing a severe fire hazard. Inspect all HP fuel lines and connections meticulously.
• **Scavenge Fires:** Accumulation of carbon and oil in the scavenge space can ignite, leading to fire. Regular scavenge space inspections and cleaning are crucial.
• **Hot Surfaces & Rotating Machinery:** Engine components operate at high temperatures, and rotating parts (flywheel, turbocharger) pose entanglement risks. Ensure guards are in place and proper PPE is used.
• **Confined Space Entry:** Entry into crankcase or scavenge space requires strict adherence to confined space entry procedures (gas testing, ventilation, standby personnel).

Class survey

A class surveyor will typically focus on the overall operational integrity and safety aspects. Key checks include: verification of engine safety devices (overspeed trip, low lube oil pressure, high cooling water temperature, oil mist detector functionality), emergency stop operation, remote control system functionality, integrity of fuel oil and lube oil systems (no leaks, proper fire insulation), condition of crankcase relief valves, foundation bolts, and general engine room cleanliness. They will review engine logbooks for performance trends, alarm history, and maintenance records. If opened, scavenge space and crankcase inspections will be performed. They will also verify compliance with MARPOL regulations regarding fuel oil changeover procedures and emission control systems (if fitted).