Cummins QSB 6.7 Turbocharger & Related Components

The Cummins QSB 6.7L turbo system is engineered to deliver high efficiency, optimal air management, and reliable power output for both marine and industrial applications. The turbocharger and its supporting components work together to manage airflow, maintain boost pressure, and optimize engine combustion, resulting in improved performance and fuel economy. At Diesel Pro Power, we supply high-quality turbocharger components, seals, hoses, clamps, and gaskets to keep your QSB 6.7 running at peak efficiency—trusted by over 40,000 satisfied customers worldwide.

Overview of the QSB 6.7 Turbo System

The QSB 6.7L is a single-turbo engine that uses precision-engineered components to deliver consistent airflow under a wide range of operating conditions. In marine applications, a properly functioning turbo system ensures quicker acceleration, better throttle response, and sustained top-end power. For industrial uses, the turbo system enhances torque delivery, making heavy-duty tasks more efficient.

The turbo system integrates with key engine systems, including the air intake, aftercooler, and exhaust, making each supporting component critical for maintaining performance and reliability.

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Core Turbocharger Components

Cummins Airsep System – Single Turbo

The Airsep system is a premium air filtration and separation unit designed to optimize clean airflow into the turbocharger. By removing oil mist and airborne contaminants before they reach the compressor, it extends turbocharger life, protects sensitive internal components, and helps maintain factory performance specifications. The Airsep for the QSB 6.7 features a 4-inch throat diameter for optimal flow, making it ideal for marine engines operating in salt-laden environments and industrial engines in dusty job sites.

Key Benefits:

• Enhanced turbocharger protection

• Reduced oil carryover into the intake system

• Maintains boost efficiency by ensuring unrestricted airflow

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Cummins Intake Manifold Cover Gasket

The intake manifold cover gasket creates a secure, leak-free seal between the manifold cover and the cylinder head. This gasket prevents unmetered air from entering the system, which could otherwise affect boost pressure and fuel efficiency. Made from high-temperature-resistant materials, it is designed to withstand the pressures and thermal cycling of turbocharged operation.

Key Benefits:

• Maintains optimal air-to-fuel ratio

• Prevents boost loss through air leaks

• Designed for long service life under high heat

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Cummins O-Ring for Aftercooler

The aftercooler O-ring seals the connection between the aftercooler and adjoining components, ensuring that cooled, pressurized air is delivered efficiently to the intake. A damaged O-ring can lead to air leaks, reduced turbo efficiency, and lower overall engine performance. This O-ring is compatible with the QSB 6.7 and engineered for resistance to oil, heat, and pressure.

Key Benefits:

• Maintains boost pressure integrity

• Oil- and heat-resistant sealing material

• Ensures proper aftercooler function

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Cummins Turbo Oil Drain Gasket

The turbo oil drain gasket is essential for preventing leaks where oil returns from the turbocharger to the engine sump. A compromised gasket can cause oil leaks, which may lead to turbo bearing wear or environmental contamination. This gasket is precision-cut to ensure a perfect fit for the QSB 6.7.

Key Benefits:

• Prevents oil leaks from turbo drain lines

• Reduces risk of oil starvation to turbo bearings

• Durable construction for high-heat environments

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Turbo Installation & Maintenance Accessories

Hi-Temperature Jointing Compound for Turbos

This specialized jointing compound is formulated for sealing flanged joints in high-temperature environments, such as turbocharger housings. Rated for operating temperatures between 550°C and 760°C, it ensures a gas-tight seal even under extreme exhaust temperatures. Suitable for both Cummins and Detroit Diesel turbos, it prevents exhaust gas leakage, maintains boost pressure, and improves turbocharger efficiency.

Key Benefits:

• High-heat tolerance for demanding turbo applications

• Creates durable, leak-proof seals

• Resistant to vibration and thermal cycling

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Detroit Diesel & Cummins Hump Hose (4” x 4”)

The hump hose is a flexible, reinforced silicone connector designed to handle high boost pressures while accommodating engine movement and vibration. Its 4-inch diameter is compatible with QSB 6.7 turbo systems, allowing secure connection between intake piping and the turbocharger or aftercooler.

Key Benefits:

• Flexible design absorbs vibration and misalignment

• High-temperature silicone construction

• Reinforced for pressure stability

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Cummins Clamp for 4” Diameter Filters

The clamp ensures a secure connection between the air filter and intake piping, maintaining a sealed pathway for clean air to enter the turbocharger. A proper seal prevents unfiltered air from bypassing the filter element, protecting the turbo from debris damage.

Key Benefits:

• Ensures tight, leak-free air intake connections

• Corrosion-resistant hardware for long life

• Quick and secure fastening

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