Turbocharger · Turbochargers
The AT23 from IHI Corporation is a 4-stroke marine diesel engine designed to handle exhaust gas and charge air applications. Engineered for reliability in harsh maritime environments, it is part of the AT/RH Series, known for its robust performance across various marine operations. Common issues include compressor fouling, turbine-side fouling, bearing wear, and seal leakage. For optimal operation, use exact IHI execution codes when replacing cartridge or rotor components. Regular servicing should adhere to the manufacturer's manual and classification society guidelines, with an annual inspection during class survey. Stocking spare parts as specified by IHI ensures minimal downtime and continuous engine efficiency.
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What our service work and the manufacturer documentation say about keeping this model running.
Servicing per the manufacturer's manual and classification society requirements. Annual inspection at class survey. Stock spare parts as specified by the manufacturer.
| Routine visual inspection and performance monitoring | Daily/Weekly |
|---|---|
| Compressor water washing | 250-500 running hours (or as indicated by performance drop) |
| Turbine water washing | 500-1000 running hours (or as indicated by performance drop) |
| Bearing inspection/replacement (minor overhaul) | 4,000-8,000 running hours (depending on engine type and operating conditions) |
| Major overhaul (full dismantling, cleaning, bearing/seal replacement, rotor balancing) | 12,000-16,000 running hours or every 3-4 years |
| Annual Class Survey inspection | Annually |
| Rotor axial clearance | New: 0.15 - 0.30 mm; Wear Limit: +0.10 mm from new value (e.g., if new 0.20mm, limit 0.30mm) |
|---|---|
| Rotor radial clearance | New: 0.05 - 0.15 mm; Wear Limit: +0.05 mm from new value |
| Bearing shell thickness | Refer to IHI AT23 manual for specific minimum thickness (typically a few tenths of a mm reduction from new) |
| Shaft run-out | Maximum allowable 0.02 - 0.03 mm |
| Blade tip clearance (compressor/turbine) | Refer to IHI AT23 manual for specific minimum clearance |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Class surveyors typically review the turbocharger's maintenance logbook entries, including dates of cleaning, bearing replacements, and major overhauls. They will visually inspect for external oil or exhaust gas leaks, check for excessive vibration during operation, and verify the integrity of safety devices (e.g., overspeed trip, if fitted). If the turbocharger is opened for scheduled maintenance during the survey, the surveyor may witness bearing inspections, clearance measurements (axial/radial), and general condition of the rotor and casings to ensure compliance with manufacturer's recommendations and class rules.
Estimated lifetime: 48,000 - 64,000 running hours (with regular major overhauls every 12,000-16,000 hours and proper maintenance)
Use exact IHI execution code for replacement cartridge or rotor components.
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