SD 60SD

Common issues

• Bearing wear and failure (axial and radial bearings), often due to lubrication issues or imbalance.
• Compressor fouling (accumulation of dirt/oil on compressor wheel and diffuser), leading to reduced efficiency and surging.
• Turbine fouling and erosion (deposits from HFO combustion, e.g., vanadium, sulfur, soot), causing imbalance, reduced efficiency, and potential blade damage.
• Rotor imbalance leading to excessive vibration, which can damage bearings and other components.
• Surging (unstable operation), often triggered by rapid engine load changes, severe fouling, or incorrect turbocharger matching.
• Oil leakage from bearing housing seals, indicating seal wear or improper oil drainage.
• Exhaust gas leakage from turbine casing joints, expansion bellows, or drain lines, posing a fire risk and reducing efficiency.
• Cracks in turbine casing or nozzle ring due to thermal stress and fatigue.

Inspection checklist

• Check bearing housing temperatures using an IR thermometer (typical range: 60-90°C, consult manual for limits).
• Verify lube oil pressure and flow to the turbocharger bearings are within manufacturer's specifications.
• Inspect air filter elements for cleanliness, damage, and proper seating; clean or replace as necessary.
• Measure rotor axial and radial play using a dial gauge (critical clearance measurement, compare to new/service limits).
• Visually inspect compressor and turbine wheels for fouling, erosion, foreign object damage (FOD), and blade cracks.
• Inspect nozzle ring and diffuser for fouling, erosion, cracks, and proper alignment.
• Listen for unusual noises (e.g., whining, rubbing, knocking) and feel for excessive vibration on the casing.
• Check for any oil or exhaust gas leakages from casings, joints, drain lines, and connections.
• Verify proper operation of the water washing system (if fitted) and ensure drain lines are clear and functional.

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 sets (axial and radial bearings)
• Oil seals and O-rings for bearing housing and other critical interfaces
• Air filter elements (full set or sufficient quantity for replacement)
• Nozzle ring segments (or complete nozzle ring, as these are prone to erosion/fouling)
• Diffuser segments (less critical than nozzle ring, but good to have for major overhaul)
• Gasket sets for casing joints, connections, and inspection covers
• Balancing weights (for rotor re-balancing during overhaul, if performed onboard or at service station)

Safety

• High temperatures: Exhaust gas and turbine casing can reach >400°C. Risk of severe burns and fire hazard from fuel/oil impingement.
• High-speed rotating parts: The rotor assembly operates at tens of thousands of RPM. Risk of severe injury if casing integrity is compromised or during improper maintenance.
• Pressurized systems: Charge air, exhaust gas, and lube oil systems are under pressure. Risk of injury from sudden release or component failure.
• Hot lube oil: Risk of burns from hot oil leaks and fire hazard if oil sprays onto hot surfaces.
• Confined spaces: During internal inspections or maintenance, ensure proper ventilation, lockout/tagout procedures, and confined space entry protocols are followed.

Class survey

Class surveyors typically focus on: 1. Verification of up-to-date maintenance records, logbook entries, and compliance with maker's service schedule. 2. General condition of the turbocharger, absence of excessive leaks (oil/exhaust), unusual noises, or vibration. 3. Operational test to confirm normal running parameters (temperatures, pressures, RPM) and functionality of associated alarms (e.g., high bearing temperature, low oil pressure). 4. Integrity of casing, foundations, mounting bolts, and insulation on hot parts. 5. Functionality of safety devices such as overspeed trip (if applicable to the system) and charge air pressure relief valves. 6. Evidence of proper cleaning and maintenance practices, especially for HFO applications.

Estimated lifetime: 16,000 - 24,000 hours (between major overhauls)