Cummins 6CTA Engine Parts - Exhaust Section

Exhaust Manifold & Related Components for Cummins 6CTA Engines

The exhaust manifold is a critical part of the Cummins 6CTA engine, responsible for collecting exhaust gases from multiple cylinders and routing them to the turbocharger or exhaust system. In marine and industrial applications—where engine reliability and thermal efficiency are non-negotiable—the integrity and design of the exhaust manifold directly impact overall performance, fuel economy, and engine longevity.

Diesel Pro Power offers a complete catalog of exhaust manifold components for Cummins 6C, 6CT, and 6CTA 8.3 engines, including water-cooled marine manifolds, gaskets, bolts, turbo connections, and insulation accessories. All parts are in stock and ready to ship globally.

Water-Cooled Marine Exhaust Manifold for Cummins 6CTA

This direct replacement manifold is designed specifically for Cummins 6C-series engines used in marine applications, including the 6C, 6CT, and 6CTA 8.3L variants. It features a water-jacketed design that helps regulate exhaust temperatures and reduce the risk of thermal fatigue—critical for boats operating in warm climates or under sustained load.

Key Features:

• Fully water-cooled design for marine use
  
  

• Engineered to OEM dimensions for direct fit
  
  

• Supports all standard Cummins 6CTA turbo configurations
  
  

• Cast from corrosion-resistant material
  
  

• Built for long service life in saltwater and freshwater environments
  
  

Proper manifold installation also improves turbocharger efficiency by optimizing exhaust flow and minimizing pressure loss between the cylinder head and turbo inlet.

Exhaust Manifold Gaskets for Cummins 6CTA

A complete Cummins 6CTA exhaust system rebuild should always include fresh gaskets. Diesel Pro Power supplies individual exhaust manifold gaskets as well as full sets. Each 6CTA engine typically requires six exhaust manifold gaskets, one for each exhaust port.

Key Benefits:

• High-temp sealing material prevents exhaust leaks
  
  

• Compatible with all 6C, 6CT, and 6CTA variants
  
  

• Resists blowout even under extreme pressure
  
  

Replacing aged gaskets prevents exhaust leaks that can damage turbochargers, reduce fuel efficiency, and increase backpressure.

Turbo Mounting Gasket (Water-Cooled Turbo Only)

This gasket forms a secure, leak-proof seal between the exhaust manifold and the turbocharger flange. It is designed specifically for marine engines equipped with water-cooled turbos, helping maintain turbo boost efficiency and preventing exhaust leakage at the turbo base.

Use Cases:

• Ideal for vessels running 6CTA engines with water-cooled turbochargers
  
  

• Resists warping and blowouts from repeated thermal cycles
  
  

• Easy to install during turbo service or full manifold replacement
  
  

Exhaust Manifold Bolts for Cummins 6CTA and Related Engines

Proper torque and thread engagement are essential for exhaust manifold bolt integrity, especially in high-vibration marine environments. These heavy-duty bolts are compatible with multiple Cummins engine platforms including 6C, 6CT, 6CTA, ISC, and QSC series engines.

Applications:

• Exhaust manifold mounting
  
  

• Alternator bracket mounting
  
  

• Refrigerant compressor mounting
  
  

Note: Always torque bolts to factory specification and replace them when performing a manifold rebuild to avoid future leaks or failures.

Exhaust Manifold Outlet Connection Gasket

Located at the exit of the exhaust manifold, this gasket ensures a tight seal where the manifold connects to the exhaust piping or elbow. It plays a key role in maintaining backpressure consistency and preventing hot gas leakage into the engine compartment.

Features:

• Durable, heat-resistant material
  
  

• Matches OEM outlet dimensions
  
  

• Easy drop-in installation
  
  

Perfect for use in both commercial vessels and high-performance marine engines.

Intake Connection Gasket for Cummins 6CTA

Although technically part of the intake system, the intake connection gasket is often replaced during manifold service—especially when working on turbocharger systems that bridge the intake and exhaust assemblies.

Highlights:

• Seals the turbo-to-intake elbow connection
  
  

• Compatible with 6C, 6CT, and 6CTA engines
  
  

• Prevents boost leaks and ensures optimal turbo performance
  
  

Exhaust System Insulation & Heat Management

Efficient exhaust insulation is essential for marine safety and performance. In enclosed engine compartments, excess exhaust heat can degrade nearby components and reduce engine room ventilation efficiency. Diesel Pro Power offers high-performance insulation solutions designed to complement your Cummins 6CTA manifold setup.

Manifold Insulation Tape – 3" and 4" Width Options

Our industrial-grade insulation tape provides a thermal barrier that wraps around the manifold and exhaust piping, reducing surface temperature and preventing radiant heat buildup. Available in 3" and 4" widths, both versions are 100 feet long and 1/8" thick.

Why Use Manifold Insulation?

• Reduces risk of burns in tight engine compartments
  
  

• Helps maintain cooler ambient temperatures
  
  

• Protects hoses, sensors, and electrical wiring from thermal degradation
  
  

Industrial Exhaust Manifold Flanges (4-Inch)

If you're building or retrofitting an industrial-grade exhaust system, these 4" flanges are compatible with Cummins 6CTA exhaust outlet dimensions. They provide a strong mechanical interface between the manifold outlet and custom piping.

Specs:

• 4" inner diameter
  
  

• Machined for tight exhaust mating surfaces
  
  

• Heavy-duty construction suitable for high-temp marine or land-based use
  
  

Gasket for 4-Inch Exhaust Flange

A high-temp gasket is required to seal the flange connection between the exhaust manifold and piping or muffler inlet. These gaskets are precision-cut to match the 4" flange and withstand extended thermal cycling.

Features:

• Prevents gas leakage under pressure
  
  

• Reduces vibration-related joint fatigue
  
  

• Simple to replace during muffler or pipe servicing
  
  

Industrial-Grade Mufflers and Accessories

Marine and industrial 6CTA engines often route their exhaust through a muffler system to reduce sound levels. Diesel Pro Power offers compatible mufflers and accessories designed to match the 4" NPT configuration found on many Cummins exhaust systems.

Industrial Muffler – 4-Inch NPT

This robust muffler is designed for diesel engines requiring noise suppression and backpressure management. With threaded 4" National Pipe Thread (NPT) ports on both ends, it integrates easily into Cummins-powered generator sets, marine engines, and stationary power units.

Key Features:

• Reduces exhaust noise without restricting flow
  
  

• Compatible with Cummins 6CTA marine and industrial applications
  
  

• Constructed for harsh operating environments
  
  

Muffler End Caps – 3" to 5" Diameter

We carry a range of muffler outlet caps to protect your exhaust system from water, debris, or corrosion when the engine is not in use. These caps are essential for boats exposed to salty air, heavy rain, or industrial dust.

Available Sizes:

• 3", 3.5", 4.5", and 5"
  
  

• Simple press-fit design
  
  

• Ideal for winterization and long-term storage
  
  

Importance of Maintaining a Proper Exhaust Seal

When operating in marine environments, even minor exhaust leaks can lead to rapid corrosion, compromised fuel economy, or engine overheating. Faulty gaskets or warped manifolds may allow high-temperature gases to escape into the engine bay, damaging nearby wiring and insulation.

Always inspect your manifold and associated gaskets during regular maintenance intervals. If your Cummins 6CTA shows signs of soot trails, unusual exhaust noise, or loss of turbo boost, the exhaust manifold assembly should be thoroughly evaluated.