TCR18

Common issues

• Turbine-side fouling (reduced efficiency, high exhaust gas temperature, increased back pressure)
• Compressor diffuser and impeller fouling (reduced boost pressure, surging risk, increased charge air temperature)
• Bearing damage (excessive axial/radial play, abnormal noise, vibration, oil leakage, reduced rotor speed)
• Rotor imbalance and vibration (accelerated bearing wear, potential for shaft damage or blade failure)
• Oil leakage from bearing housing (internal into gas/air stream or external)
• Exhaust gas leakage from casing joints or expansion bellows (gasket failure, casing cracks, reduced turbine efficiency)
• Air filter clogging (reduced air intake, increased pressure drop, potential for compressor cavitation)

Inspection checklist

• Check bearing axial and radial play using a dial gauge (critical for radial turbochargers). Compare to manufacturer's limits.
• Inspect compressor impeller and diffuser for fouling, erosion, foreign object damage (FOD), and secure attachment.
• Inspect turbine wheel and nozzle ring (if applicable) for fouling, cracks, erosion, and FOD. Check for free rotation of rotor.
• Verify lubricating oil supply pressure and temperature to the bearings. Take oil samples for quality analysis (viscosity, TBN, water, wear metals).
• Monitor and record exhaust gas temperatures before and after the turbine, and charge air pressure/temperature. Compare to baseline values.
• Visually inspect the turbocharger casing for cracks, hot spots, oil/gas leaks, and secure mounting bolts.
• Check the condition of the air filter elements and measure differential pressure across the filter.
• Listen for abnormal noises (whining, grinding, rubbing) during operation and during run-down after shutdown.
• Inspect exhaust gas expansion bellows and charge air ducting for leaks or damage.

Service intervals

Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.

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/kit (journal and thrust bearings, O-rings, seals)
• Gasket and O-ring set for overhaul (especially for gas-tight joints)
• Air filter elements
• Lubricating oil filter elements (if turbocharger has a dedicated filter)
• Nozzle ring (if applicable and prone to wear/fouling in specific applications)
• Rotor balancing weights (for re-balancing after repairs)

Safety

• High rotational speeds (up to 100,000+ RPM for TCR18) pose a risk of rotor burst if components fail or are imbalanced.
• Extremely hot surfaces (turbine casing, exhaust pipes) can cause severe burns. Always allow for cooldown before inspection.
• High pressure charge air and exhaust gas can cause injury if released uncontrollably during maintenance or due to component failure.
• High noise levels during operation require mandatory hearing protection.
• Hot lubricating oil under pressure can spray and cause burns or create fire hazards if it contacts hot surfaces.

Class survey

Annual visual inspection for leaks, cracks, and security of mounting. Performance parameters (boost pressure, exhaust gas temperatures, bearing oil parameters) are checked against baseline. During intermediate or special surveys (typically every 2.5 or 5 years), internal inspection of compressor and turbine sides for fouling, erosion, and damage is usually required, often necessitating partial disassembly. Bearing clearances (axial and radial play) are typically measured and recorded. Review of maintenance records, running hours, and spare parts inventory is mandatory. Verification of lubricating oil system integrity and oil quality is also checked.

Estimated lifetime: 8,000 - 12,000 running hours before major overhaul, depending on operating conditions, fuel quality, and adherence to maintenance schedules.