Turbocharger · Turbochargers
The Napier NA557‑557S is a high‑capacity turbocharger built for two‑stroke, slow‑speed large‑bore marine diesel engines, supporting engine ratings up to roughly 40 MW.
Do you have the manufacturer datasheet for this model? Send it with the enquiry form — we check it and name the source.
| major_overhaul | 30000 to 40000 hours |
|---|---|
| bearing_replacement | 10000 to 15000 hours |
| seal_replacement | 5000 to 10000 hours |
| compressor_wheel_cleaning | 1000 to 5000 hours |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
| compressor_wheel | 5% to 10% reduction in diameter due to erosion or fouling |
|---|---|
| turbine_blade | 5% to 10% reduction in length due to erosion or corrosion |
| bearing_housing | 0.1 to 0.5 mm clearance increase due to wear |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
The class surveyor will typically check the turbocharger's performance, including its ability to provide the required boost pressure and airflow, as well as its overall condition and maintenance history. The surveyor will also verify that the turbocharger is properly installed, aligned, and secured, and that all safety devices and guards are in place and functioning correctly.
Estimated lifetime: 40000 to 60000 hours
Free of charge — send us your request for Napier (Wabtec) equipment. Our team checks it and replies by e-mail.
Other models of the same equipment type, Napier (Wabtec) first.
Tell us what you need for this Napier (Wabtec) NA557 557S — a part, a service call, a second opinion. Are you Napier (Wabtec)? Claim this brand page.
Service engineer? Write the day report for this NA557 557S in OceanSphere Work — photos, hours and parts, as a PDF for the owner. Try it free for 14 days →
Yes. Specifications, documents and service notes for this model are readable without an account. An account adds saved searches and requests, nothing is taken away.
Yes. Tell us the manufacturer, the model and what you need — a person reads every request and replies by e-mail.
Send us the nameplate or the correct value. We check it against the manufacturer datasheet or class-society record and update the page.