6L6EY22ALW

Common issues

• Common Rail Injector fouling, leakage, or failure due to HFO quality variations or wear, leading to poor combustion and high exhaust gas temperatures.
• High-Pressure Fuel Pump wear or malfunction, causing unstable fuel pressure or insufficient delivery, impacting engine performance.
• Exhaust Valve burning, sticking, or seat wear, particularly when operating on HFO, leading to compression loss and reduced power.
• Turbocharger bearing wear, fouling of compressor/turbine blades, or exhaust gas leakage, resulting in reduced boost pressure and engine efficiency.
• Cylinder liner wear (especially at the top ring reversal point) and piston ring sticking/breakage, often exacerbated by HFO combustion byproducts or inadequate lubrication.
• Cooling water system issues, including heat exchanger fouling (jacket water, charge air cooler), pump seal leaks, or corrosion leading to overheating.
• Lube oil degradation, contamination, or excessive consumption, potentially leading to accelerated bearing wear or piston ring issues.
• Vibration damper (viscous or rubber type) degradation, which can lead to excessive torsional vibrations and crankshaft damage if not addressed.

Inspection checklist

• Thorough visual inspection for any leaks (fuel, lube oil, cooling water, exhaust gas) from pipes, flanges, seals, and engine block.
• Verify all critical operating parameters (LO pressure, FW temperature, EG temperatures per cylinder, charge air pressure/temperature) are within manufacturer's specified ranges.
• Inspect the common rail fuel system: check HP pump, fuel rail, and injector high-pressure lines for leaks, chafing, or signs of stress. Ensure spray shields are intact.
• Check turbocharger for abnormal noise, excessive axial/radial play, and inspect air filter condition. Look for signs of oil leakage from compressor/turbine sides.
• Monitor exhaust gas temperatures for each cylinder to identify potential injector, valve, or combustion issues (imbalance indicates a problem).
• Inspect engine foundation bolts and anti-vibration mounts for tightness, corrosion, or signs of degradation.
• Verify proper operation of all safety devices, including overspeed trip, low lube oil pressure shutdown, high cooling water temperature shutdown, and emergency stop.
• Check the condition and cleanliness of the charge air cooler and jacket water cooler. Look for signs of fouling or external damage.
• Take a fresh lube oil sample for onboard spot tests (water, insolubles) and send for comprehensive laboratory analysis.
• Listen for any abnormal engine noises (knocking, grinding, whistling) or observe unusual vibrations during operation.

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 Common Rail Injector (at least one per cylinder, or a minimum of 2-3 units)
• High-Pressure Fuel Pump repair kit or spare pump element(s)
• Full set of Fuel Filters (primary, secondary, and common rail filters)
• Full set of Lube Oil Filters
• Turbocharger bearing cartridge or complete repair kit
• Cylinder Head Gasket (at least one)
• Various O-rings and gaskets for common leak points (e.g., fuel lines, cooling water pipes, inspection covers)
• Critical pressure and temperature sensors (e.g., LO pressure, FW temperature, exhaust gas temperature sensor)

Safety

• Extremely high-pressure fuel lines (up to 2000 bar) in the common rail system pose a severe risk of 'diesel injection injury' if leaking. Always ensure proper shielding and never approach with bare hands.
• Hot surfaces (exhaust manifold, turbocharger, charge air cooler) require proper insulation and caution to prevent severe burns. Verify insulation integrity.
• Rotating machinery (flywheel, coupling, cooling fan) must have all guards securely in place to prevent entanglement and injury.
• Potential for crankcase explosion if proper maintenance (e.g., oil mist detector functionality, crankcase relief valve inspection) is neglected. Ensure crankcase relief valves are clear and functional.
• Emergency stop and overspeed trip systems must be fully functional and regularly tested to prevent catastrophic engine failure or runaway conditions.

Class survey

A class surveyor will typically focus on: 1. Review of engine logbooks, maintenance records, running hours, and recent lube oil analysis reports to assess engine health and adherence to maintenance schedules. 2. Verification of proper operation of all safety devices, including overspeed trip, low lube oil pressure shutdown, high cooling water temperature shutdown, and emergency stop functionality. 3. Inspection of engine foundation bolts, chocking, and anti-vibration mounts for integrity, signs of movement, or corrosion. 4. Thorough check for leaks from fuel, lube oil, cooling water, and exhaust gas systems. Particular attention to high-pressure fuel lines and their shielding. 5. Verification of crankcase relief valve functionality and flame trap cleanliness. 6. General running condition of the engine, absence of abnormal noise or vibration, and stable operation under load (if possible to demonstrate). 7. Confirmation of exhaust gas temperature monitoring and alarm functionality, and general cleanliness of the engine room around the auxiliary engine.