Parts for Detroit Diesel 12V71 Non-Turbo for Australia - Cylinder head Section

Detroit Diesel 12V71 Non-Turbo Cylinder Head and Related Components

The Detroit Diesel 12V71 is one of the most iconic members of the legendary Series 71 two-stroke engine family. Built to deliver continuous-duty reliability for marine and industrial applications, the 12V71 non-turbo variant remains in service around the globe powering workboats, fishing vessels, standby generators, dredges, and industrial machinery.

At the heart of its performance is the cylinder head assembly, which manages air intake, exhaust flow, fuel combustion, and valve timing. Keeping the cylinder head and related components in proper condition is essential to ensure smooth operation, reduce downtime, and extend engine life. This catalog covers all major cylinder head and related parts for the Detroit Diesel 12V71 non-turbo engine, from bare heads to valve covers, gasket kits, injectors, fasteners, and precision tools.

Cylinder Heads for Detroit Diesel 12V71 Non-Turbo

Rebuilt Bare Cylinder Head

A cost-effective option for operators maintaining classic 12V71 engines.

• Rebuilt bare head, inspected and machined.

• Designed for 12-cylinder inline-V configuration.

• Sold with a refundable core deposit.

• Provides an affordable way to refresh top-end components while maintaining OEM performance standards.

New Bare Cylinder Head

Ideal for owners seeking maximum service life and long-term durability.

• Brand new head casting with no wear.

• Provides a clean foundation for complete rebuilds.

• Suited for marine operators who want to minimize downtime between overhaul cycles.

Cylinder Head with Valves & Springs

A ready-to-install option that reduces workshop labor.

• Includes fully installed intake and exhaust valves.

• Equipped with precision-balanced valve springs.

• Compatible with natural aspirated (non-turbo) and turbocharged configurations.

• Saves time compared to transferring components from older assemblies.

Complete Cylinder Head Assembly

The premium solution for heavy-duty rebuilds.

• Fully assembled unit including valves, springs, retainers, seals, and guides.

• Designed for high-performance variants with J6 valves.

• Ideal for operators seeking a “drop-in” solution to restore full top-end functionality.

Gasket Kits and Sealing Components

Cylinder Head Gasket Kit for 12V71

Every cylinder head installation requires correct sealing.

• Engine requires two kits for full coverage.

• Prevents combustion leaks, coolant seepage, and oil cross-contamination.

• Manufactured to OEM specifications for long service life.

Rocker Cover Gaskets

Available in both new and old styles.

• Gray rubber for aluminum rocker covers (new style).

• Black rubber for tin covers (old style).

• Ensures proper sealing to prevent oil leakage from valve covers.

Water Manifold Gaskets & Plates

• Water rail manifold gasket prevents coolant leaks.

• Cylinder head water outlet plates designed for precise fit.

• Critical for engines exposed to marine cooling systems.

Valve Cover Breather Seals

• Maintains proper crankcase ventilation.

• Prevents oil mist from escaping into the environment.

• Essential for compliance with vessel cleanliness standards.

Valves, Guides, and Related Components

Exhaust Valves

• Heavy-duty U-style exhaust valves.

• Designed to withstand extreme heat from combustion cycles.

Valve Seals

• Prevent oil leakage into the combustion chamber.

• Required in multiples (4 per cylinder).

Valve Guides

• Maintain precise alignment for valve stems.

• Reduces wear and improves long-term reliability.

Valve Seats

• Hardened inserts provide durable sealing surfaces.

• Essential for engines running under continuous load.

Valve Springs & Retainers

• Provide proper valve closing pressure.

• Prevent valve float under high RPM conditions.

• Used in conjunction with valve caps and spring seats.

Fasteners, Studs, and Brackets

Head Bolts

• 5/8” x 5 3/8” bolts designed for correct torque retention.

• Essential for maintaining head-to-block sealing under high compression.

Rocker Arm Brackets and Shafts

• Support rocker arms that actuate intake and exhaust valves.

• Hardened steel construction for maximum durability.

Push Rods and Retainers

• Connect cam followers to rocker arms.

• Precision-machined for correct valve timing.

Cam Followers and Guides

• Transfer camshaft motion to push rods.

• Built for reliability under continuous-duty cycles.

Valve Covers and Related Hardware

Valve Covers (Used and Refurbished)

• Available with oil filler openings and breathers.

• Sandblasted, inspected, and primed for reuse.

• Cost-effective solution for maintaining older engines.

Rocker Cover Kits

• Includes gaskets, seals, and related hardware.

• Ensures leak-free operation.

Oil Filler Caps

• Designed to fit 12V71 valve covers.

• Provides secure closure and prevents contamination.

Cooling and Fuel System Connections

Injector Tubes and Installation Tools

• Precision-formed tubes for proper fuel delivery.

• Flaring die tools available for correct installation.

Fuel Line Connectors and Seals

• Short and long jumper lines for 12V71 fuel systems.

• O-ring seals for both old and new style configurations.

• Essential for preventing leaks in high-pressure diesel systems.

Restricted and Non-Restricted Connectors

• Various fittings including T-connectors, elbows, and return lines.

• Designed for precise fuel metering and system reliability.

Rocker Arms and Related Components

Rocker Arms (Left, Right, and Injector)

• Available in standard and rebuilt options.

• Designed to withstand high cycle loads.

• Precision-balanced to maintain valve timing accuracy.

Rocker Arm Shafts

• Hardened shafts provide support for rocker arm assemblies.

• Critical for even load distribution.

Precision Tools and Accessories

Feeler Gauges

• Range from .002” to .025” for valve lash adjustment.

• Required for proper cylinder head maintenance.

Socket Wrenches for Fuel Lines

• Designed to install and remove injector fuel lines.

• Prevents damage to fittings during service.

Engine Paint and Finishing Accessories

• Authentic Detroit Diesel green paint for finishing.

• Used to restore classic 12V71 appearance after overhaul.

Why Choose Diesel Pro Power for Detroit Diesel 12V71 Cylinder Head Parts

Choosing the right supplier is as important as choosing the right parts. Diesel Pro Power has become the global leader in Detroit Diesel parts supply because we combine depth of inventory, technical expertise, and worldwide shipping capabilities that other distributors cannot match.

Trusted by Over 40,000 Customers Worldwide

• Decades of experience supplying marine and industrial operators.

• Proven reliability serving tugboats, commercial vessels, offshore rigs, and heavy machinery.

• Repeat customers trust Diesel Pro Power for consistent quality and support.

Global Shipping to More Than 180 Countries

• Fast, trackable shipping ensures downtime is minimized.

• Whether your vessel operates in U.S. coastal waters, South America, Europe, Africa, or Asia, parts arrive quickly and securely.

Complete Catalog in One Place

• From bare cylinder heads to the smallest valve washer, everything is available under one roof.

• Eliminates the need to search multiple suppliers.

• Reduces risk of mismatched or incompatible parts.

Exclusive Focus on Marine and Industrial Engines

• Unlike automotive suppliers, Diesel Pro Power specializes in continuous-duty diesel platforms like the Detroit Diesel 12V71.

• Expertise ensures you get the exact configuration for your engine.

• All products are vetted for professional-grade durability.

Expert Technical Support

• Specialists available to guide you in selecting the correct head, gasket kit, valves, or fuel system components.

• Advice tailored to the 12V71 non-turbo configuration, preventing costly errors.

• Backed by real-world experience supporting marine and industrial operators.