A100-M

Common issues

• Compressor fouling, particularly on engines running heavy fuel oil (HFO), leading to reduced efficiency and surge.
• Turbine-end fouling and erosion due to poor combustion, high exhaust gas temperatures, or low-quality fuel, impacting power output.
• Bearing wear (journal and thrust) caused by contaminated lube oil, insufficient oil supply, or excessive rotor vibration.
• Rotor vibration resulting from uneven deposits on compressor or turbine blades, bearing wear, or imbalance after maintenance.
• Oil leakage from bearing housings or seals, indicating seal wear or improper oil drainage.
• Exhaust gas leakage from turbine casing joints or expansion bellows, posing a safety hazard and reducing efficiency.
• Air filter clogging, leading to reduced air intake, lower boost pressure, and potential compressor surge.
• Thermal cracks in turbine casing or nozzle ring due to extreme temperature fluctuations or material fatigue.

Inspection checklist

• Visually inspect compressor and turbine blades for fouling, erosion, impact damage, and cracks. Note color and deposit patterns.
• Check axial and radial play of the rotor shaft (if accessible) to assess bearing condition. Compare with manufacturer's limits.
• Inspect lube oil supply and drain lines for leaks, proper flow, and signs of contamination in the oil.
• Examine air filter elements for cleanliness and integrity. Ensure no foreign objects are ingested.
• Inspect turbine and compressor casings for cracks, hot spots, exhaust gas leaks, and secure mounting.
• Monitor and record boost pressure, exhaust gas temperatures (inlet/outlet), and turbocharger RPM (if sensor fitted) for deviations from normal operating parameters.
• Listen for unusual noises (whining, grinding, rubbing) and observe for excessive vibrations during operation.
• Check integrity and tightness of all mounting bolts, clamps, and connections (air, exhaust, oil, water).
• Verify proper operation of water washing system (if fitted) and ensure nozzles are clear.

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 set (thrust and journal bearings)
• Oil seals and O-rings for bearing housing
• Gasket sets for casing joints and connections
• Air filter elements (if applicable)
• Washing nozzles (compressor and turbine)
• Balancing shims (for rotor balancing during overhaul)
• Fasteners (nuts, bolts, locking washers for critical connections)

Safety

• High surface temperatures (up to 550°C on turbine casing) – severe burn hazard. Always use appropriate PPE.
• High rotational speeds (up to 50,000-60,000 RPM) – risk of catastrophic rotor failure if unbalanced or damaged.
• High pressure compressed air – potential for injury from sudden release or ruptured components.
• High noise levels (100-120 dB) – hearing protection is mandatory in the vicinity.
• Hot oil spray from leaks – fire hazard and burn risk. Ensure proper containment and immediate repair of leaks.

Class survey

Class surveyors typically verify the turbocharger's external condition for leaks, damage, and secure mounting. They review maintenance records (logbook entries for cleaning, bearing replacements, overhauls) to ensure compliance with manufacturer and classification society requirements. Operational parameters (boost pressure, temperatures) are often checked, and the availability of critical spare parts is confirmed. Any significant vibration or unusual noise will prompt further investigation. The surveyor will also check for compliance with exhaust gas emission regulations and proper functioning of safety devices, if applicable.