TCR12

Common issues

• Compressor fouling (reduced air flow, surging, increased exhaust temperature)
• Turbine fouling (reduced power output, increased exhaust back pressure, higher exhaust temperatures)
• Bearing wear (increased axial and radial play, leading to rotor imbalance, vibration, and potential contact between rotor and casing)
• Seal leakage (oil ingress into compressor or turbine side, leading to oil consumption and potential carbon build-up)
• Rotor imbalance (often a consequence of fouling, bearing wear, or blade damage, causing excessive vibration and accelerated wear)
• Casing cracks (especially on the hot turbine casing due to thermal cycling and stress, leading to exhaust gas leakage)

Inspection checklist

• Visually inspect compressor and turbine wheels for fouling, erosion, foreign object damage (FOD), or blade cracks.
• Check rotor axial (end float) and radial play (shaft wobble) using a dial gauge, comparing against manufacturer's limits.
• Inspect for oil leaks from bearing housings, oil supply/drain lines, and seal areas.
• Verify the condition of the air filter element and clean/replace as necessary to prevent compressor fouling.
• Examine the turbocharger casing (compressor, turbine, and bearing housing) for cracks, corrosion, or signs of overheating.
• Monitor and record turbocharger performance parameters (boost pressure, exhaust gas temperatures pre/post turbine, lubricating oil pressure/temperature) and compare to baseline and engine load.
• Listen for abnormal noises (whining, grinding, rubbing) or excessive vibration during operation.
• Check the security of all mounting bolts, air ducts, exhaust piping, and oil/water connections.

Service intervals

Typical wear limits

Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.

Critical spares

• Bearing kit (journal bearings, thrust bearing, thrust collar)
• Seal rings (gas side and oil side)
• Gasket and O-ring set for overhaul
• Air filter element (if applicable to the specific installation)
• Lubricating oil filter element (for the turbocharger's dedicated oil supply, if any)
• Balancing weights (for rotor re-balancing during major overhaul)

Safety

• High surface temperatures of the turbine casing and exhaust gas piping (severe burn hazard).
• High rotational speeds of the rotor (potential for catastrophic disintegration if overspeed or severe imbalance occurs, leading to shrapnel hazard).
• Pressurized air and exhaust gas systems (risk of blow-out or injury during maintenance if not properly depressurized).
• Hot lubricating oil (burn hazard during draining, leakage, or component handling).
• Noise levels during operation (hearing protection is mandatory in machinery spaces).

Class survey

Class surveyors will primarily focus on verifying that the turbocharger has been maintained in accordance with the manufacturer's recommendations and classification society requirements. This includes reviewing maintenance records, service reports, and logbook entries for performance parameters. A visual inspection will be conducted for external damage, leaks, and secure mounting. The surveyor may request confirmation of bearing play measurements (if accessible or documented) and check the functionality of any associated safety devices (e.g., overspeed trip, alarms). Compliance with the annual inspection requirement is crucial.

Estimated lifetime: 20,000 - 30,000 running hours between major overhauls. With diligent maintenance, timely component replacement, and proper operation, the core unit can exceed 100,000 running hours.