A100-M 100-M37

Common issues

• Bearing wear (journal and thrust bearings), leading to increased clearances and vibration.
• Compressor fouling due to dirty intake air or oil carry-over, reducing air flow and efficiency.
• Turbine fouling (carbon deposits) from incomplete combustion or poor fuel quality, increasing exhaust back pressure and reducing power.
• Oil leakage from bearing housing seals, oil supply/drain lines, or casing joints.
• Rotor imbalance or foreign object damage (FOD) to compressor/turbine wheels, causing excessive vibration and potential catastrophic failure.
• Surging, often indicated by a 'barking' sound, caused by operational issues, fouling, or engine/turbocharger mismatch.
• Cracks in the turbine or compressor casings due to thermal stress, vibration, or material fatigue.
• Nozzle ring and/or diffuser damage/fouling, impacting gas flow and turbocharger performance.

Inspection checklist

• Check for abnormal noise, vibration, or surging during operation (use vibration monitoring if available).
• Inspect compressor wheel for fouling, erosion, foreign object damage, and rub marks (via air intake).
• Inspect turbine wheel for fouling, erosion, and damage (via exhaust gas outlet, if accessible, or during scheduled opening).
• Verify oil supply and drain lines for leaks, proper flow, and oil pressure/temperature (if instrumented).
• Measure axial and radial rotor clearances (during scheduled maintenance or if abnormal operation is suspected).
• Inspect air filter condition and ensure proper sealing to prevent unfiltered air ingress.
• Check turbocharger casing for cracks, hot spots, signs of gas or oil leakage, and security of mounting bolts.
• Monitor exhaust gas back pressure and charge air pressure/temperature for deviations from normal operating parameters.
• Inspect wastegate or bypass valve (if fitted) for proper operation and sealing.
• Verify integrity of exhaust gas manifold connections to the turbocharger for 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

• Complete bearing cartridge assembly (journal bearings, thrust bearing, seals)
• Set of O-rings and gaskets for casing, oil lines, and inspection covers
• Rotor shaft nut (critical for reassembly after maintenance)
• Nozzle ring segments or complete nozzle ring (depending on design)
• Diffuser (if separate component and prone to damage/fouling)
• Oil filter elements (if the turbocharger has an integral oil filter)
• Cleaning agents for compressor and turbine washing

Safety

• High Temperatures: Exhaust gas casing and turbine components operate at extremely high temperatures (up to 600°C+). Risk of severe burns.
• High-Speed Rotation: The rotor operates at very high RPMs. Never attempt to inspect or touch rotating parts while the engine is running or cooling down.
• High Pressure: Charge air and exhaust gas are under significant pressure. Ensure systems are depressurized before opening.
• Hot Oil: Lubricating oil can be hot and under pressure. Exercise caution when checking oil lines or sumps.
• Noise: Turbochargers generate high noise levels. Hearing protection is mandatory in the vicinity during operation.

Class survey

Class surveyors typically verify the turbocharger's overall condition and maintenance status. Key checks include: reviewing maintenance records (running hours, washing logs, bearing replacements, overhaul dates); inspecting for external oil or exhaust gas leaks; checking casing integrity for cracks, deformation, or signs of overheating; confirming security of mounting and connections; observing operation for abnormal noise, vibration, or surging; and verifying the condition of the air filter. They will also confirm that the turbocharger is operating within specified parameters and that any safety devices (e.g., overspeed trip, if applicable) are in good order.

Estimated lifetime: 16,000 - 24,000 hours before major overhaul (rotor, bearings, seals, nozzle ring, diffuser). Total lifetime can exceed 48,000 hours with proper maintenance and timely overhauls.