Napier · Turbocharger

Napier NA397 Spare Parts

Genuine and Alang-reconditioned spare parts for the Napier NA397 marine exhaust-gas turbocharger — medium-speed 4-stroke marine main engines, large power generation, cruise-vessel propulsion. Shipped from Bhavnagar, India to any port worldwide.

Parameter	NA397
Maker	Napier
Model	NA397
Equipment	Marine exhaust-gas turbocharger
Power	Highest power rating in the 7 Series (up to ~13 MW total on vee engines with two NA397) — single-turbo rating not public
Pressure ratio	Higher than NA357 (specific value Not publicly available — increased pressure-ratio variant)
Application	Medium-speed 4-stroke marine main engines, large power generation, cruise-vessel propulsion
Production years	~2013 – present (newer 7-Series flagship; supplied as retrofit on cruise-liner applications)

Figures as published for the NA397. Where a figure is not in a source we hold, this page says “not published to us” rather than estimating it. Send your equipment and part number and we confirm against the nameplate before quoting.

NA397 Spare Parts We Supply

Rotor shaft with turbine wheel
Compressor wheel / impeller
Nozzle ring
Journal bearings
Thrust bearing
Complete cartridge / rotor assembly
Labyrinth and seal rings
Diffuser
Gas inlet and outlet casing
Silencer and air filter element
Bearing bush and sleeve
O-rings, gaskets and fasteners

Genuine, OEM-equivalent and Alang-reconditioned. Every reconditioned part is measured against the maker’s limits before it leaves us. If your part is not listed, send the part number — most Napier items are sourceable through the yard.

About the Napier NA397

The Napier NA397 is a marine exhaust-gas turbocharger. Built ~2013 – present (newer 7-Series flagship; supplied as retrofit on cruise-liner applications). Application: Medium-speed 4-stroke marine main engines, large power generation, cruise-vessel propulsion

Source: our Turbocharger spec research file (turbocharger/03-napier.md).

Why Source NA397 Parts from Wattmare?

We are in Bhavnagar, next to Alang — the world’s largest ship-recycling yard, and where reconditioned marine parts actually come from. We hold fast-moving items, source the rest through the yard and our trader network, and dispatch worldwide in 24–48 hours on emergency orders.

Salim Dholia
Wattmare · Bhavnagar / Alang, India

View All Napier Models

All Napier spare parts Turbocharger spare parts Reconditioned parts Alang ship spares 24–48hr emergency

Frequently Asked Questions

What Napier NA397 spare parts do you supply?

Genuine, OEM-equivalent and Alang-reconditioned parts for the NA397, including rotor shaft with turbine wheel, compressor wheel / impeller, nozzle ring, journal bearings, thrust bearing. Send the part number for anything not listed.

What is the delivery time for NA397 parts?

Stock items dispatch the same or next working day from Bhavnagar. Emergency orders ship in 24–48 hours to any major port. Sourced items depend on the yard — we confirm a real date before you commit.

Are your NA397 parts genuine or reconditioned?

Both. We supply genuine and OEM-equivalent new parts, and Alang-reconditioned parts measured against the maker's limits before dispatch. We tell you which you are buying — we do not sell reconditioned as new.

Need NA397 parts?

Send the equipment number and part number. We quote with a real availability date, not a maybe.

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