Parts for Detroit Diesel 12V71 Turbo – Turbo Section

The Detroit Diesel 12V71 turbocharged marine engine is one of the most iconic powerplants in heavy-duty marine and industrial applications. Known for its unmatched torque, robust power output, and longevity, the 12V71 turbo setup delivers the boost and airflow efficiency that made Detroit Diesel a leader in two-stroke diesel technology. Whether powering a commercial vessel, tugboat, generator, or industrial machine, maintaining the turbo system in peak condition is essential to ensuring performance, fuel efficiency, and engine reliability.

At Diesel Pro Power, every component listed in our Detroit Diesel 12V71 Turbo Section is specifically engineered for the 12V71 configuration and its marine-intercooled systems. From full turbochargers and riser adaptors to gaskets, clamps, hoses, and Airsep filtration systems, each part is designed for a seamless fit and long-term dependability.

Turbochargers for Detroit Diesel 12V71 Engines

The turbocharger is the heart of the Detroit Diesel 12V71’s forced induction system. By compressing intake air before it enters the engine, the turbo allows for more efficient combustion and improved horsepower output without increasing engine displacement.

Detroit Diesel Turbocharger for 12V71 Marine Engines (New)

This new turbocharger is designed for intercooled marine applications, ensuring optimal performance under high-load conditions. Manufactured to OEM standards, it provides a perfect fit for Detroit Diesel 12V71 engines and is compatible with related Detroit Diesel models including the 6-71, 8V149, 12V149, and 16V149. It features precision-balanced turbines, heavy-duty bearings, and robust compressor housing designed for high boost pressures and consistent airflow.

Turbochargers in this category are corrosion-resistant, with housings coated for marine protection. The improved aerodynamics of the compressor wheel contribute to faster spool-up times, minimizing turbo lag and maximizing throttle response — critical for heavy vessels that demand immediate power during maneuvering or towing operations.

Turbocharger for Detroit Diesel Aftercooled Engines (Rebuilt)

The rebuilt Detroit Diesel turbocharger for Series 71 and 92 engines features a turbine housing ratio of 1.03 and a compressor housing ratio of 0.75, a setup that optimizes balance between airflow and exhaust velocity. Each rebuilt turbo is disassembled, cleaned, and reassembled with new internal components including seals, bearings, and thrust collars. The final assembly is high-speed balanced to ensure OEM-level efficiency and reliability.

All rebuilt units undergo strict performance testing to confirm boost pressure integrity, oil seal function, and proper wastegate calibration. When installed on a 12V71 engine, this turbo delivers smooth acceleration, excellent mid-range torque, and reduced exhaust smoke due to more efficient fuel-air mixing.

Turbo System Adaptors, Risers, and Connectors

The Detroit Diesel 12V71 turbo system requires several precision-engineered adaptors and riser components to maintain optimal air and exhaust flow between the turbocharger and the engine manifold system.

Detroit Diesel Riser Connector for 12V71 Engines

The riser connector links the turbocharger exhaust outlet to the exhaust riser assembly, which channels exhaust gases safely away from the engine compartment. Built from marine-grade alloys, this connector resists heat fatigue, vibration, and corrosion common in saltwater environments. The seamless connection design prevents back pressure losses, improving overall turbo efficiency.

Detroit Diesel Adaptor for 12V71 – New and Used

The new turbo adaptor for the Detroit Diesel 12V71 is designed for high-temperature resistance and precise alignment between the turbo outlet and riser system. Its heavy-duty construction ensures structural integrity under extreme exhaust pressures. Diesel Pro Power also offers used adaptors in excellent condition, professionally inspected and ready for installation for those seeking budget-friendly options.

Turbo Riser Adaptor

With an inner diameter of 4” and outer diameter of 6.25”, this turbo riser adaptor ensures proper connection between the turbo and exhaust riser. The correct height (1.125”) maintains factory exhaust geometry, preventing unwanted back pressure while ensuring that exhaust gases are expelled efficiently.

Turbo Gaskets and Seals for 12V71 Marine Engines

Proper sealing is crucial in maintaining a pressurized turbo system. Diesel Pro Power offers all major gaskets and sealsneeded for 12V71 turbo installation and maintenance.

Turbo Gaskets

• 5” Turbo Gasket: Ideal for standard turbo outlet flanges; built from heat-resistant composite materials to withstand high exhaust temperatures.

• 5.5” Turbo Gasket: Designed for larger-diameter turbo housings to ensure an airtight seal.

• Marine Manifold Flange Gasket: Provides a perfect seal between the exhaust manifold and turbo riser, preventing exhaust leaks that could reduce turbo efficiency.

• Oil Supply and Return Gaskets: Ensure proper oil flow to and from the turbo bearings. A small leak in these areas can lead to bearing damage or oil contamination, making gasket replacement an important maintenance step.

High-Temperature Sealant

The 762 Hi-Temperature jointing compound is designed specifically for turbo installations. Rated up to 760°C, it’s ideal for securing flanges, gaskets, and threaded fittings that experience extreme heat and vibration.

Turbo Clamps, Bolts, and Hardware

High-performance marine engines require secure fastening systems to ensure that the turbo assembly remains leak-free and aligned during operation.

Turbo Clamps

Available in 4”, 5.25”, and 5.75” diameters, these stainless-steel clamps are engineered to maintain consistent pressure under thermal expansion cycles. Their heavy-duty band design provides a tight seal without distorting the connection, crucial for preventing boost loss.

Turbo Mounting Hardware

Diesel Pro Power stocks bolts, washers, and nuts made from corrosion-resistant alloys designed to handle both marine humidity and extreme turbo heat. Each turbo typically requires four of each fastener for secure installation, ensuring proper torque distribution and vibration resistance.

Turbo Blankets and Riser Blankets

Marine-Grade Turbo Blankets

Turbo blankets for the Detroit Diesel 12V71 are Coast Guard approved and constructed from ultra-heavy-duty, stainless-steel reinforced fabric. They insulate the turbocharger, reducing radiant heat in the engine room — an important factor for both safety and efficiency. Lower temperatures around the engine bay also improve air intake density, leading to more consistent turbo performance.

Riser Blankets – Right and Left Bank

The right and left turbo riser blankets are designed for dual-turbo 12V71 setups. These marine-approved covers are heat-shielded with stainless wiring and thick insulation material that traps radiant heat while protecting nearby components from high exhaust temperatures. Proper use of riser blankets not only meets safety standards but also enhances the life of surrounding electrical and hydraulic systems.

Turbo Silencer Systems and Air Management

Turbo Silencer

The Detroit Diesel Turbo Silencer reduces noise and vibration generated by the high-speed compressor. It’s particularly effective in marine applications where cabin comfort and crew safety are priorities. Its robust construction allows it to function in humid and high-pressure environments without degrading acoustic performance.

Silencer Filter Element

This filter element fits turbo silencers with an 8.25" outer diameter, maintaining clean airflow and preventing dust or debris from entering the compressor housing. Regular filter replacement is recommended to maintain unrestricted airflow and prevent premature turbo wear.

Airsep Systems and Components for 12V71 Turbo Engines

The Walker Engineering Airsep System is a critical component for 12V71 twin-turbo setups. Designed with a 6-inch flange, it provides superior crankcase ventilation and filtration, reducing oil mist and contaminants in the intake system.

Airsep Filtration and Accessories

• Tapered Air Filters (9x9 and 9x12): These filters enhance engine breathing efficiency, reduce turbo lag, and maintain consistent airflow under varying load conditions.

• Airsep Spring Sets: Maintain proper filter tension and ensure the Airsep unit remains secure even in rough sea conditions.

• Vacuum Regulator and Cleaning Kit: Keep the Airsep system functioning at optimal performance, maintaining vacuum pressure balance and extending the lifespan of your turbo components.

Hump Hoses and Flexible Turbo Connections

Proper turbo plumbing requires durable, heat-resistant hoses that can withstand both pressure and movement.

Detroit Diesel Hump Hoses

Available in multiple diameters (4” to 6”), Detroit Diesel hump hoses provide vibration absorption and pressure sealing between turbo, intercooler, and intake manifolds. Their reinforced silicone construction ensures flexibility while preventing collapse under boost pressure. Diesel Pro Power supplies reductions and straight hose sizes for every 12V71 turbo configuration.

Gaskets and Seals for Exhaust and Manifold Systems

In addition to turbo gaskets, Diesel Pro Power provides marine exhaust manifold flange spacers and related seals to ensure the entire turbo and exhaust assembly remains leak-free. These components play a vital role in maintaining back pressure balance and preventing loss of turbo boost due to exhaust leaks.

Maintenance, Installation, and Performance Optimization

Maintaining the Detroit Diesel 12V71 turbo system involves regular inspection and cleaning of hoses, clamps, gaskets, and turbo oil lines. Marine operators should monitor for signs of oil leakage, corrosion on clamps or adaptors, and soot buildup around flange joints. Proper torque on fasteners and the use of high-temperature sealants are key to preventing boost leaks and improving system longevity.

When replacing a turbocharger, always:

• Replace the oil supply and return gaskets

• Clean oil lines to prevent contamination

• Check for excessive shaft play or bearing noise

• Verify proper turbine housing orientation for the marine configuration

Upgrading to new or rebuilt turbos from Diesel Pro Power ensures OEM-grade reliability and full compatibility with Detroit Diesel 12V71 marine engine setups, including aftercooled and intercooled variants.

Why Choose Diesel Pro Power for Detroit Diesel 12V71 Turbo Parts

Diesel Pro Power is trusted by over 40,000 satisfied customers worldwide for providing the highest-quality Detroit Diesel parts online. Our inventory is fully stocked with new and rebuilt 12V71 turbo components, ready for immediate global shipping.

When you order from Diesel Pro Power, you benefit from:

• All parts in stock and ready to ship worldwide

• Real-time order tracking for full transparency

• Technical expertise dedicated exclusively to Detroit Diesel systems

• Detailed installation resources, including torque specs and assembly diagrams

• Comprehensive warranties on all new and rebuilt turbos

• Marine-grade corrosion protection for every product

• 24/7 online availability with fast customer support response times

Every turbo component — from riser blankets to gaskets — is precision-tested and approved for use in marine environments. Whether you’re performing a full rebuild, replacing a single turbo, or upgrading your 12V71 system for improved performance, Diesel Pro Power ensures that your engine continues to deliver the dependable output that Detroit Diesel engines are known for.