TCR

Common issues

• Compressor fouling leading to reduced efficiency and surge
• Variable Turbine Geometry (VTG) sticking or sluggish operation (where fitted), impacting engine response and fuel efficiency
• Bearing wear (radial and axial play) due to contaminated lube oil, insufficient lubrication, or high vibration
• Turbine-side fouling and/or erosion from HFO operation, causing imbalance and reduced power output
• Rotor imbalance resulting from fouling, blade damage, or bearing wear, leading to excessive vibration
• Oil leakage from bearing housing (internal into gas/air stream or external), indicating seal or bearing issues
• Casing cracks due to thermal stress cycling or excessive vibration

Inspection checklist

• Visual inspection for oil leaks (internal/external), exhaust gas leaks, casing cracks, and loose fastenings
• Check axial and radial bearing play using a dial gauge against manufacturer's specified limits
• Inspect compressor and turbine blades for fouling, erosion, foreign object damage (FOD), and verify tip clearances
• Verify lubrication system parameters: oil pressure, temperature, and condition of oil filters. Sample lube oil for analysis.
• Inspect intake air filter elements for cleanliness and integrity
• Check Variable Turbine Geometry (VTG) mechanism (if fitted) for free movement and proper actuation
• Monitor vibration levels and trends, comparing against baseline and alarm limits
• Record and analyze operational parameters: boost pressure, exhaust gas temperatures (before/after turbine), turbocharger RPM, and differential pressures
• Confirm functionality of overspeed trip device and associated alarms

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 or individual thrust and radial bearings
• Sealing rings (gas and oil side)
• O-rings and gaskets for casing joints and inspection covers
• Lube oil filter elements
• Air filter elements (if applicable to turbocharger intake system)
• VTG actuator repair kit (if VTG fitted)
• Set of special tools for dismantling and assembly

Safety

• High-speed rotating machinery: Risk of catastrophic uncontained failure if rotor integrity is compromised (e.g., overspeed, severe imbalance, FOD). Always ensure overspeed trip is functional.
• High temperatures: Exhaust gas temperatures can exceed 500°C; hot surfaces pose severe burn risk. Ensure all insulation and lagging are intact.
• High pressures: Compressor discharge and exhaust gas pressures are significant; potential for leaks or rupture. Always depressurize systems before opening.
• Noise: High noise levels during operation require hearing protection.
• Confined spaces/Hot work: Maintenance often involves working in hot, confined spaces, requiring proper permits and safety procedures.

Class survey

Class surveyors typically verify maintenance records and logbook entries, conduct a visual inspection for external leaks, general condition, and integrity of insulation. They will check the functionality of safety devices such as the overspeed trip (if required by class rules and feasible onboard) and confirm proper alarm settings. Operational parameters during engine trials (boost pressure, exhaust temperatures) are often observed. The availability of critical spare parts as per class requirements is also checked.