Parts for Detroit Diesel 671 Non-Turbo - (2 Valve Head Type) for Canada - Cylinder head Section

Cylinder Head and Related Components for Detroit Diesel 6-71 (2 Valve Head Type)

The Detroit Diesel 6-71 is one of the most iconic engines in the world of heavy-duty diesel power. Introduced as part of the Series 71 family, the 6-71 was originally developed for continuous-duty marine, industrial, and military applications. Known for its inline six-cylinder design, two-stroke cycle operation, and rugged reliability, the 6-71 quickly became a preferred choice for vessels, power generators, and heavy equipment.

While many versions of the 6-71 exist, the two-valve cylinder head configuration remains a classic. It was engineered for simplicity, durability, and serviceability in demanding environments. Maintaining or rebuilding these engines requires precision and high-quality parts—especially when it comes to the cylinder head and its related components. This section provides a complete catalog and technical overview of every critical part for the Detroit Diesel 6-71 non-turbo, two-valve head type.

Importance of Cylinder Head Maintenance on the Detroit Diesel 6-71

The cylinder head is the beating heart of your Detroit Diesel 6-71 engine’s top end. It houses the valves, valve seats, injectors, and key passages for fuel, coolant, and lubrication. In a two-stroke design like the 6-71, the head plays a direct role in air handling and combustion efficiency.

A worn or damaged head can lead to:

• Loss of Compression – Caused by worn valves, seats, or gaskets, leading to reduced power output.

• Overheating – Cracked or leaking coolant passages reduce cooling efficiency.

• Excessive Oil Consumption – Worn guides and seals allow oil to enter the combustion chamber.

• Fuel Leaks – Damaged injector tubes or seals compromise efficiency and create safety risks.

By keeping the cylinder head and its related components in proper condition, operators extend the lifespan of their Detroit Diesel 6-71 engines and ensure consistent performance in marine and industrial duty cycles.

Rebuilt Cylinder Heads for Detroit Diesel 6-71 (2 Valve Type)

Rebuilt cylinder heads are a smart solution for operators who want the reliability of OEM castings with the assurance of modern reconditioning processes. Every rebuilt head is carefully inspected, pressure tested, machined, and refitted to meet or exceed original Detroit Diesel specifications.

Bare Rebuilt Cylinder Heads

Bare heads provide the foundation for a rebuild. They come stripped of valves and springs, making them ideal for customers who want to fit their own components or customize the valve train setup. Benefits include:

• Precision-machined surfaces for proper sealing.

• Pressure-tested coolant passages to prevent leaks.

• Cleaned and primed castings ready for immediate installation.

Rebuilt Heads with Valves and Springs Installed

For a time-saving alternative, rebuilt heads with valves and springs pre-installed are available. These assemblies reduce labor, minimize installation time, and come ready for direct bolt-on use.

• Includes high-quality intake and exhaust valves.

• Fitted with heavy-duty springs for continuous-duty cycles.

• Professionally assembled to ensure balanced seating and sealing.

Both options are backed by Diesel Pro Power’s core deposit system, which allows you to return your old head for credit, reducing overall cost and supporting sustainability.

Cylinder Head Gasket Kits for Detroit Diesel 6-71

Cylinder head gaskets and sealing components are critical for keeping combustion, oil, and coolant properly separated within the engine. On the 6-71 two-valve engine, replacing gaskets during any head service is mandatory to prevent leaks and premature wear.

Complete Cylinder Head Gasket Kits

These all-in-one kits provide every necessary seal to reinstall the cylinder head with confidence. They include:

• Main head gasket (engineered for two-valve style heads).

• Rocker cover gaskets.

• Intake and exhaust manifold gaskets.

• Governor and accessory gaskets.

Each gasket is designed to withstand extreme heat and compression cycles typical of Detroit Diesel continuous-duty engines.

Rocker Cover Gaskets

Two styles are available:

• Old-Style Black Rubber – Designed for tin covers found on older engines.

• New-Style Gray Rubber – Designed for newer aluminum rocker covers.

Proper selection ensures leak-free sealing and longer gasket life.

Other Gaskets

• Governor Gaskets – Seal the governor housing to the head.

• Water Manifold Gaskets – Prevent coolant leaks at the water rail manifold.

• Head-to-Manifold Gaskets – Ensure tight exhaust connections for efficiency.

Cylinder Head Hardware and Fasteners

Every cylinder head rebuild requires fresh hardware to ensure proper clamping force and secure connections.

Head Bolts

Detroit Diesel 6-71 head bolts are engineered for high tensile strength, providing the necessary clamping force to keep the head sealed against the block.

Studs and Washers

Used for water manifolds and accessory mounting, studs and washers distribute load evenly and prevent leaks.

Nuts and Retainers

Small but essential, these components secure the valve train and other assemblies to the head. Replacing fatigued hardware prevents vibration-related loosening and potential engine failure.

Valve Train Components for the 6-71 Two-Valve Head

The valve train is responsible for controlling airflow and maintaining compression in the combustion chamber. Diesel Pro Power offers every essential component for the two-valve 6-71.

Valves and Seats

• Exhaust Valves – 30-degree valves designed to withstand high-heat exhaust gases.

• Valve Seats – Hardened seats ensure proper valve sealing and reduce wear under heavy loads.

Guides and Seals

• Valve Guides – Maintain alignment of the valve stem for efficient operation.

• Valve Seals – Prevent oil leakage into the combustion chamber, reducing oil consumption and smoke.

Springs and Retainers

• Valve Springs – Designed for two-valve engines, ensuring consistent tension and preventing valve float.

• Retainers and Keepers – Lock valves in position, maintaining precise timing.

Rocker Arms, Push Rods, and Cam Followers

The mechanical linkage between the camshaft and valves is critical to reliable engine timing.

• Rocker Arm Brackets and Bolts – Provide stability for the valve actuation system.

• Push Rods, Springs, and Seats – Transfer motion from the camshaft to the valves.

• Cam Followers and Guides – Hardened surfaces ensure durability under continuous contact.

Each component is precision-engineered for Detroit Diesel two-stroke performance.

Valve Covers and Breather Systems

Protecting the cylinder head while ensuring proper crankcase ventilation is the role of the valve cover assembly.

• Valve Covers – Available in inspected and primed used condition, these covers protect the top end from debris.

• Breather Elements – Regulate crankcase pressure and reduce harmful blow-by gases.

• Oil Filler Caps – Provide secure oil access while preventing contamination.

Fuel System Connections at the Cylinder Head

The Detroit Diesel 6-71 two-valve head integrates several fittings that ensure proper fuel delivery and return.

• Injector Tubes – Carry fuel directly into the combustion chamber.

• Fuel Return Connectors – Control return flow to maintain proper fuel pressure.

• Restriction Connectors and Fittings – Ensure correct flow dynamics for injector balance.

• Fuel Jumper Lines (Short and Long) – Distribute fuel evenly between injectors.

Proper fuel line and fitting maintenance is critical to efficient operation and safety.

Cooling System Components for the Cylinder Head

To keep the 6-71 running under heavy loads, its cylinder head must be properly cooled.

• Water Manifold Gaskets and Studs – Provide secure, leak-free coolant passages.

• Cylinder Head Water Outlet Plates – Durable plates that manage coolant flow.

• Fresh Water Pump Gaskets – Ensure leak-free operation at the pump interface.

Specialty Tools for Cylinder Head Service

Servicing a Detroit Diesel 6-71 two-valve cylinder head requires specialized tools to maintain precision.

• Feeler Gauges – Used to calibrate valve lash settings with exact tolerances.

• Injector Tube Flaring Tools – Essential for installing or reconditioning injector tubes.

• Injector Line Sockets – Ensure proper torque during installation without damaging fittings.

Using the correct tools prevents mistakes and prolongs component life.

Why Choose Diesel Pro Power for Your Detroit Diesel 6-71 Cylinder Head Parts

Choosing the right supplier is as critical as choosing the right part. Diesel Pro Power delivers unmatched reliability, convenience, and expertise.

• Trusted by Over 40,000 Customers Worldwide – Decades of proven service supporting marine and industrial operators.

• Global Shipping to 180+ Countries – Fast, trackable delivery ensures downtime is minimized.

• Complete Catalog in One Place – From bare cylinder heads to the smallest washers, every part is available.

• Exclusive Focus on Marine & Industrial Engines – Unlike general suppliers, Diesel Pro Power specializes in continuous-duty Detroit Diesel engines.

• Expert Technical Support – Guidance on valve configurations, gasket selection, and installation best practices.

By choosing Diesel Pro Power, you gain access to the most complete catalog of Detroit Diesel 6-71 two-valve cylinder head components available online, backed by fast delivery and world-class service.