TCA66

Common issues

• Nozzle ring and turbine blade fouling, leading to reduced efficiency and increased exhaust back pressure.
• Compressor impeller fouling or erosion, causing reduced air flow and potential surge.
• Bearing wear (journal and thrust bearings) leading to excessive rotor play and vibration.
• Rotor imbalance due to deposits, erosion, or mechanical damage, causing high vibration.
• Turbine casing thermal cracking, particularly around gas inlet/outlet and expansion joints on aged units.
• Exhaust gas leaks from casing joints, expansion bellows, or sealing rings.
• Oil leaks from bearing housings or drain lines.
• Air filter clogging, restricting air intake and reducing turbocharger performance.

Inspection checklist

• Visually inspect for any exhaust gas or oil leaks from casing joints, seals, and drain lines.
• Check the condition and cleanliness of the air inlet filter element.
• Inspect the compressor impeller for fouling, erosion, or damage (if accessible through inlet).
• Monitor bearing temperatures and lubricating oil pressure/flow from instrumentation; listen for abnormal noises.
• Inspect the turbine casing and exhaust gas piping for thermal cracks, deformation, or signs of overheating.
• Check the security of all mounting bolts, foundation, and pipe connections.
• Inspect the condition of insulation and lagging for integrity and signs of hot spots.
• Review engine and turbocharger operational logs for abnormal vibration levels, temperatures, or performance drops.
• If possible and safe, manually check rotor free rotation and listen for rubbing or grinding sounds (engine stopped, cooled).

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 journal and thrust bearings with associated seals)
• Gasket sets for turbine and compressor casings
• Sealing air labyrinth seals / piston ring seals
• Nozzle ring segments (if applicable, or a complete spare nozzle ring)
• Air filter elements
• High-temperature bolts and nuts for casing joints
• Oil pump (if externally driven and critical for lubrication)

Safety

• Extreme surface temperatures (exhaust casing, gas pipes) posing severe burn hazards.
• High-speed rotating components (rotor) - risk of severe injury during operation or potential for uncontained failure.
• High noise levels requiring mandatory hearing protection in the vicinity.
• Pressurized exhaust gas and charge air systems - ensure proper depressurization before any maintenance.
• Potential for oil mist ignition in the engine room if oil leaks are not promptly addressed.

Class survey

The class surveyor will typically verify maintenance records and compliance with the manufacturer's service schedule. A general visual inspection for external damage, leaks (oil/gas), and cleanliness is performed. Security of mounting, foundations, and pipe connections is checked. Insulation integrity and signs of hot spots are noted. Operational parameters (vibration, bearing temperatures, pressures) from logbooks are reviewed. For major surveys (e.g., 5-year), confirmation of internal inspections (bearings, nozzle ring, rotor) as per manufacturer's guidelines is required.