A200-M

Common issues

• Loss of turbocharger efficiency due to compressor fouling (diffuser, impeller)
• Reduced turbine performance from nozzle ring and turbine blade fouling
• Oil leakage from worn or damaged oil seals (compressor and turbine side)
• Bearing damage (journal and thrust) due to lube-oil starvation, contamination, or excessive axial/radial play
• Rotor imbalance leading to excessive vibration and bearing wear
• Exhaust gas leakage from casing joints or expansion bellows
• Foreign object damage (FOD) to compressor impeller or turbine blades
• Surging due to engine operational issues or turbocharger component degradation

Inspection checklist

• Check for oil leaks at bearing casings, drain lines, and air/gas connections.
• Verify axial and radial play of the rotor shaft (cold condition) against manufacturer's limits.
• Inspect compressor impeller and diffuser for fouling, erosion, or damage.
• Inspect turbine blades and nozzle ring for fouling, erosion, cracks, or damage (requires opening).
• Check air filter condition and ensure proper sealing.
• Verify security of mounting bolts, support brackets, and exhaust gas connections.
• Monitor operational parameters: turbocharger RPM, exhaust gas temperatures (in/out), charge air pressure and temperature, lube oil pressure and temperature.
• Listen for unusual noises (whining, grinding, rubbing) during operation.
• Inspect exhaust gas casings and expansion bellows for cracks or leaks.

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 (journal and thrust bearings)
• Oil seal rings (compressor and turbine side)
• Gasket and O-ring sets for casing openings and connections
• Air filter elements
• Nozzle ring segments (if applicable and replaceable)
• Special tools for dismantling and assembly
• Lube oil filter elements (if dedicated turbocharger lube oil system)

Safety

• Hot surfaces: Exhaust gas casings and turbine outlet are extremely hot during and after operation. Risk of severe burns.
• Rotating machinery: Compressor inlet and turbine outlet areas contain high-speed rotating components. Risk of entanglement or injury.
• High pressure: Charge air and exhaust gas are under high pressure. Risk of injury from sudden release or component failure.
• Noise: High noise levels during operation require hearing protection.
• Potential for uncontained failure: In rare cases, rotor failure can lead to high-velocity projectile release. Ensure safety barriers are in place if specified.

Class survey

Class surveyors typically require documentation of maintenance history, running hours, and previous inspection reports. They will visually inspect the external condition for leaks, security of mounting, and general integrity. For annual or special surveys, an internal inspection of the turbocharger is often required, involving opening the casing to check bearings, rotor (impeller and turbine blades), nozzle ring, diffuser, and internal casings for fouling, erosion, damage, and wear. Operational parameters are usually verified, and safety devices like overspeed trips and alarms are checked for functionality.