Turbocharger 797001-0001 12645143 55598230

The GTB1752VKL turbocharger, bearing part numbers 797001-0001, 12645143, and 55598230, is a high-performance variable geometry turbo (VGT) 

specifically designed for the Chevrolet Colorado and S-10 models equipped with the RA428 Duramax 2.8L LT/LTZ diesel engine. 

This turbocharger delivers a powerful blend of fuel efficiency, increased torque, and superior engine response, 

making it a key component in the vehicle’s performance and emissions systems.

1. Application and Compatibility

The GTB1752VKL turbocharger is engineered to fit the 2.8L Duramax diesel engine used in the following models:

• Chevrolet Colorado (2.8L LT/LTZ)

• Chevrolet S-10 (2.8L Duramax)

• RA428 engine series

These models are especially popular in South America, Southeast Asia, and other international markets for their rugged design and reliable diesel powertrain. 

The 2.8L Duramax is a four-cylinder, turbocharged diesel engine designed for light trucks and SUVs, offering strong towing capacity and off-road capabilities.

2. Technical Specifications

• Turbo Model: GTB1752VKL

• OEM Part Numbers: 797001-0001 / 12645143 / 55598230

• Turbo Type: Variable Geometry Turbocharger (VGT)

• Bearing Type: Journal bearing

• Actuator: Electronic actuator (VGT control)

• Compressor Wheel Inducer Diameter: ~44.5 mm

• Turbine Wheel Exducer Diameter: ~52 mm

• Mounting: Direct-fit bolt-on for RA428 engine

• Cooling: Oil & water-cooled center housing

• Wastegate: Controlled via electronic actuator for precise boost management

3. Advanced VGT Technology

One of the standout features of the GTB1752VKL is its Variable Geometry Technology, 

which allows the turbocharger to adjust the angle of the turbine vanes in real-time. This technology enables:

• Quicker spool-up at low RPMs, reducing turbo lag

• Higher boost pressure at mid to high RPMs, improving power delivery

• Optimized airflow, enhancing overall fuel efficiency

• Precise control of exhaust gas flow, contributing to lower emissions

VGT turbos like the GTB1752VKL are particularly effective in modern diesel engines, where both power and efficiency are crucial.

4. Performance Benefits

Equipping your Chevrolet Colorado or S-10 2.8L Duramax with the GTB1752VKL turbocharger provides several key benefits:

• Increased Horsepower and Torque: The turbo enables the engine to produce more power from the same displacement, ideal for towing and off-road use.

• Improved Throttle Response: The variable geometry design ensures faster boost build-up, eliminating much of the lag experienced in traditional fixed-geometry turbos.

• Enhanced Fuel Economy: More efficient combustion translates into reduced fuel consumption, especially during highway cruising or light load conditions.

• Extended Engine Life: By ensuring optimal air-fuel mixture and lowering cylinder temperatures, the turbo helps preserve the internal components of the engine.

5. OEM-Grade Quality and Construction

Manufactured under strict quality control standards, the GTB1752VKL turbocharger uses high-grade materials and precision engineering:

• Compressor and Turbine Wheels: Constructed from lightweight, heat-resistant alloys to withstand high speeds and exhaust temperatures.

• Center Housing: Designed for optimal oil and coolant flow, preventing overheating and reducing bearing wear.

• Actuator System: The advanced electronic actuator ensures smooth, precise VGT vane movement, adapting to real-time engine demands.

Whether as a replacement for a failing OEM turbo or as an upgrade to restore lost performance, this turbo offers reliability and durability on par with original factory components.

6. Emissions and Compliance

The GTB1752VKL is designed to meet the latest emissions regulations in key markets. By efficiently managing exhaust flow and improving combustion, the turbocharger plays a vital role in reducing:

• Particulate Matter (PM)

• Nitrogen Oxides (NOx)

• Unburned Hydrocarbons (HC)

In systems equipped with Exhaust Gas Recirculation (EGR) or Diesel Particulate Filters (DPF), the turbo’s responsive boost characteristics help maintain system temperatures and reduce regeneration cycles.

7. Installation and Maintenance

This turbocharger is designed as a direct-fit replacement for the factory turbo, making installation straightforward for professional mechanics or experienced enthusiasts. It is recommended to:

• Replace oil lines and gaskets during installation

• Use only manufacturer-approved engine oil and filters

• Prime the turbo with oil before initial start-up

• Ensure proper calibration of the electronic actuator (if required)

Regular maintenance—such as timely oil changes and air filter replacements—is essential to ensure the longevity and performance of the GTB1752VKL turbocharger.

8. Common Symptoms of a Failing Turbo (and When to Replace)

The turbocharger is a crucial engine component. If you notice any of the following symptoms, it may be time to inspect or replace the turbo:

• Excessive black or blue smoke from the exhaust

• Loss of power or poor acceleration

• Whining or siren-like noise from the engine bay

• Check engine light with turbo or boost-related codes

• Excessive oil consumption

Installing a high-quality replacement such as the GTB1752VKL will restore factory-level performance and reliability.

9. Conclusion

The GTB1752VKL Turbocharger 797001-0001 is a robust and efficient turbo solution for the Chevrolet Colorado and S-10 equipped 

with the RA428 Duramax 2.8L diesel engine. Its advanced variable geometry design, OEM-grade quality, and reliable performance 

make it an ideal replacement or upgrade for diesel truck owners who demand power, efficiency, and durability.