TCA88-25

Common issues

• Turbine-end deposits (leading to reduced efficiency, increased exhaust back pressure, and potential rotor imbalance)
• Rotor vibration (indicating bearing wear, imbalance, or foreign object damage)
• Compressor fouling (reducing air flow, boost pressure, and overall engine efficiency)
• Oil seal leakage (leading to oil consumption, contamination of air/gas streams, and carbon build-up)
• Radial and thrust bearing wear (causing excessive clearances and potential rotor contact)
• Exhaust gas leaks from casing joints, expansion bellows, or drain pipes (safety hazard and efficiency loss)
• Cracks in turbine casing or nozzle ring (due to thermal stress or material fatigue)
• Surge (operational issue, but can cause severe mechanical stress and damage if not addressed)

Inspection checklist

• Visual inspection of turbine and compressor wheels for damage, erosion, fouling, or deposits. Check for rubbing marks on casings.
• Check for oil leaks from bearing casing, oil supply/drain lines, and connections. Inspect oil mist detector if fitted.
• Inspect exhaust gas casing for cracks, hot spots, signs of overheating, or leaks from joints and expansion bellows.
• Verify tightness of all mounting bolts, foundation bolts, and associated pipe connections (air, exhaust, oil).
• Manually rotate rotor (when engine is stopped and cooled) to check for free movement, unusual resistance, or rubbing sounds.
• Measure rotor axial and radial clearances (as per maker's manual, typically during scheduled openings or if vibration is suspected).
• Inspect air filter elements for cleanliness and integrity. Check for foreign object ingress protection.
• Monitor turbocharger performance parameters (boost pressure, turbocharger RPM, exhaust gas temperatures before/after turbine, air filter differential pressure) against baseline and alarm limits.
• Check condition of lubrication oil supply and drain lines, ensuring proper flow and temperature.

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 (radial and thrust bearings, typically sleeve type for TCA series)
• Oil seal rings (compressor and turbine side, including associated O-rings)
• Gasket set for casing joints, oil lines, and air/gas connections
• O-rings for various connections and sealing points
• Air filter elements (if applicable to the specific intake arrangement)
• Lubricating oil filter elements (if the turbocharger has a dedicated oil filter)
• Nozzle ring segments (if damage or wear is common for the specific application)

Safety

• **High Rotational Speed**: Rotor operates at extremely high RPMs (e.g., 8,000-15,000 RPM for TCA88). Catastrophic failure (rotor disintegration) due to bearing failure or foreign object ingress can cause severe damage and injury.
• **High Temperatures**: Exhaust gas temperatures can reach 600°C. Hot surfaces (casing, piping) pose severe burn risks. Proper insulation and guarding are critical.
• **Pressurized Systems**: Compressor discharge air (up to 4 bar) and lubricating oil lines are under pressure. Ruptures can cause injury or spray hot oil/air.
• **Noise**: High noise levels during operation require hearing protection in the vicinity of the turbocharger.
• **Hot Work/Welding**: Extreme caution required if any hot work is performed near the turbocharger, especially if fuel or oil vapors are present, due to fire/explosion risk.

Class survey

The class surveyor will typically verify that all maintenance, inspections, and overhauls have been carried out as per the manufacturer's manual and class requirements, evidenced by logbook entries and maintenance records. They will conduct a visual inspection for external leaks (oil, exhaust gas), check the integrity of mounting and foundations, confirm the presence of critical spares, and assess the overall condition and cleanliness of the unit. Any reported defects, repairs, or unusual operational parameters will be reviewed. Safety devices and proper insulation will also be checked.