Cummins QSB 7.0 Turbocharger & Related Components

The turbocharger system is one of the most critical performance components on the Cummins QSB 7.0 engine. Designed to boost airflow and improve fuel combustion, the turbo allows this engine to deliver higher power output while maintaining efficiency and reliability in demanding marine and industrial environments. At Diesel Pro Power, we stock a complete selection of QSB 7.0 turbo components—from high-performance intake systems to gaskets, seals, and specialized hardware—ensuring that you have the right parts to keep your engine running at its peak.

With over 40,000 satisfied customers worldwide, Diesel Pro Power is trusted by marine operators, industrial equipment owners, and engine rebuild specialists for genuine-quality Cummins QSB 7.0 turbo parts that meet or exceed OEM standards.

Air Intake & Filtration Components for QSB 7.0 Turbo Systems

Cummins Airsep System – Single Turbo (4” Throat Diameter)

For QSB 7.0 engines equipped with a single turbocharger, the Airsep system is a premium air filtration and separation unit designed to provide maximum airflow while removing airborne contaminants and oil mist. Its 4-inch throat diameter allows for unrestricted intake volume, helping the turbocharger spool faster and deliver consistent boost pressure. This not only improves horsepower and torque output but also extends the life of the turbo by preventing debris and oil deposits from entering the compressor wheel.

Key Benefits:

• Enhanced airflow for improved engine performance
  
  

• Built-in oil mist separator to reduce crankcase emissions
  
  

• Corrosion-resistant construction for marine and industrial environments
  
  

• Designed for easy serviceability with replaceable filter elements
  
  

Intake Manifold Cover Gasket

The intake manifold cover gasket provides an airtight seal between the manifold cover and the cylinder head assembly. On the QSB 7.0 turbocharged engine, maintaining proper sealing is critical to ensure that all boosted air from the turbocharger reaches the combustion chambers without pressure loss. A compromised gasket can lead to reduced boost, poor engine performance, and potential turbo over-speed conditions.

Key Benefits:

• OEM-grade sealing material for durability under high-boost pressures
  
  

• Heat-resistant composition to withstand elevated turbo operating temperatures
  
  

• Precision-cut for exact fitment on Cummins QSB series engines
  
  

O-Ring for Aftercooler

In turbocharged engines like the QSB 7.0, the aftercooler (intercooler) plays a vital role in reducing the temperature of compressed air before it enters the cylinders. This O-ring ensures a leak-free seal between the aftercooler and its connecting components, preserving boost pressure and maximizing thermal efficiency. A worn or damaged O-ring can lead to loss of boost, increased intake air temperatures, and reduced fuel economy.

Key Benefits:

• High-temperature and oil-resistant elastomer construction
  
  

• Ensures optimal boost retention for consistent turbo performance
  
  

• Designed to prevent moisture intrusion and corrosion inside the aftercooler
  
  

Turbocharger Oil & Sealing Components

Turbo Oil Drain Gasket

Turbochargers require a steady flow of oil for lubrication and cooling. Once the oil passes through the turbo’s bearings, it drains back into the engine through the oil drain line. The turbo oil drain gasket provides a leak-proof seal at the drain connection, preventing oil loss and ensuring proper lubrication cycles. Replacing this gasket during turbo maintenance helps avoid oil leaks that can lead to turbo damage or contamination of surrounding engine components.

Key Benefits:

• Resists high-heat environments near the turbocharger housing
  
  

• Maintains sealing integrity under vibration and pressure changes
  
  

• Easy to install during routine turbo maintenance or rebuilds
  
  

Hi-Temperature Jointing Compound for Turbo Installations

A high-performance sealing compound specifically formulated for extreme-heat turbocharger applications. This jointing compound withstands continuous exposure to temperatures up to 760°C, making it ideal for exhaust flanges, turbine housing connections, and other turbo-mounted interfaces. By preventing exhaust leaks, it helps maintain turbine efficiency and protects nearby components from hot gas erosion.

Key Benefits:

• Suitable for both Cummins and Detroit Diesel turbocharger systems
  
  

• Excellent adhesion to metal surfaces even under vibration and heat cycling
  
  

• Chemical resistance to fuels, oils, and exhaust gases
  
  

Turbo System Hoses & Mounting Accessories

Turbocharger Hump Hose – 4” Diameter

The hump hose is designed to connect turbocharger piping where flexibility is needed due to vibration or slight misalignment. The hump section allows for compression and expansion without placing stress on the clamps or piping. This component is crucial for maintaining an airtight, high-boost connection in marine and industrial environments where constant engine movement occurs.

Key Benefits:

• 4-inch upper and lower diameter for standard QSB 7.0 turbo applications
  
  

• Reinforced silicone construction for heat and pressure resistance
  
  

• Flexible hump design prevents hose blow-off under high boost
  
  

Clamp for 4” Diameter Filters

A secure and precise clamp is essential for mounting air filters and intake assemblies in turbocharged systems. This clamp is engineered to hold 4-inch diameter filters in place, ensuring that no unfiltered air bypasses the filtration system. Proper clamping also prevents vibration-induced loosening that could compromise turbo performance.

Key Benefits:

• Heavy-duty stainless-steel construction for corrosion resistance
  
  

• Adjustable tension for a secure fit on various filter housings
  
  

• Designed to withstand vibration and thermal expansion
  
  

Maintaining the Turbocharger System on a QSB 7.0

Keeping the turbocharger and related components in top condition is critical for maximizing the performance and service life of the Cummins QSB 7.0. Regular inspection and timely replacement of gaskets, seals, clamps, and filtration components will prevent costly repairs and maintain optimal fuel efficiency. In high-load marine or industrial environments, turbocharger systems are subject to extreme temperatures, constant boost cycles, and exposure to moisture or salt air—making proactive maintenance even more important.