Turbocharger Restoration for Nanni Diesel 4.38L Engines – Toyota CT12B | BG Turbo

Presentation of the engine and application

The Nanni Diesel marine engines with a displacement of 4.38 liters, including the 4.380 TDI, 4.390 TDI and T4.155 versions, are widely used in stern drive applications. These engines are known for their robustness, reliability and efficiency in demanding marine environments.

These power units are equipped with a Toyota CT12B turbocharger, identified by several OEM references including 17201-65040 and 970312243. The turbocharger plays a critical role in engine performance by increasing air intake efficiency, improving torque delivery and maintaining optimal combustion under load.

Over time, marine operating conditions such as humidity, salt exposure and sustained operating regimes can lead to wear of internal turbocharger components, making professional restoration essential to ensure reliability and longevity.

Turbocharger restoration by BG Turbo

BG Turbo offers complete restoration services for Toyota CT12B turbochargers installed on Nanni Diesel 4.38L engines. Each turbocharger is fully disassembled, cleaned and inspected to identify wear, imbalance or damage affecting performance.

The restoration process includes replacement of worn internal components, reassembly with high-quality parts, precise balancing of the rotating assembly and final quality control to meet OEM specifications. Special attention is given to oil passages and sealing surfaces to ensure long-term reliability and safe operation.

Customers can submit their turbocharger for restoration using our dedicated repair request form:
https://www.bg-turbo.com/reparation-renovation-reconditionnement

Advantages of BG Turbo, a turbocharger restoration workshop based in France

BG Turbo is a specialized turbocharger restoration workshop based in France, with strong expertise in automotive and marine turbo systems. Our technical know-how allows us to restore rare and specific turbocharger models such as the Toyota CT12B used in Nanni Diesel marine engines.

All restoration work is carried out with strict quality standards, professional balancing equipment and controlled procedures. Restoring your turbocharger with BG Turbo ensures performance consistency, mechanical reliability and a solution that respects original manufacturer specifications.

BG Turbo supports both professionals and private owners looking for a durable and technically sound alternative to turbocharger replacement.

Parts list

Turbocharger: 970312243
Turbocharger gasket: 970312244
Turbocharger pipe sub-assembly: 970312245
Turbocharger oil gasket: 970312246
Nut: 970312247
Union bolt: 970312248
Gasket: 970312249
Turbo oil outlet gasket No.1: 970314030
Bolt: 970312251
Drain cock assembly: 970312252
Exhaust manifold gasket: 970312253

FAQ

Can BG Turbo restore a Toyota CT12B turbocharger used in marine engines?
Yes, BG Turbo can fully restore Toyota CT12B turbochargers fitted to Nanni Diesel marine engines, following a complete inspection and reconditioning process.

Is turbocharger restoration suitable for marine applications?
Professional turbocharger restoration is perfectly suitable for marine engines when carried out with proper cleaning, balancing and sealing procedures adapted to harsh operating conditions.

How can I send my turbocharger to BG Turbo for restoration?
You can submit a restoration request directly via our online form, where you will receive instructions for shipping and technical evaluation.

Hashtags

#TurbochargerRestoration
#MarineTurbo
#NanniDiesel
#ToyotaCT12B
#TurboReconditioning
#MarineEngine
#BGTurbo

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