Detroit Diesel 6-71 Non-Turbo (4 Valve Head Type) – Engine Overhaul Kit Catalog

The Detroit Diesel 6-71 engine is one of the most iconic two-stroke diesels ever produced. With its roots tracing back to the 1930s, the 6-71 has been a workhorse across marine, industrial, and military applications. The non-turbo 4-valve head version in particular is prized for its durability, airflow efficiency, and reliability under continuous operation.

This catalog covers complete overhaul kits, gasket sets, cylinder components, crankshaft seals, filters, cooling system parts, and essential tools designed specifically for rebuilding and maintaining the Detroit Diesel 6-71 Non-Turbo 4V engine. Diesel Pro Power provides worldwide support, fast shipping to over 180 countries, and trusted service with over 40,000 satisfied customers.

Detroit Diesel 6-71 Engine Specifications & Applications

• Engine Type: Inline 6-cylinder, 2-stroke diesel

• Displacement: 426 cubic inches (7.0 liters)

• Bore x Stroke: 4.25 in x 5.0 in

• Aspiration: Naturally aspirated (non-turbocharged)

• Valve Configuration: 4-valve cylinder head per cylinder (24 valves total)

• Compression Ratio: 17:1 typical for natural engines

• Horsepower Range: 165–238 HP depending on application and governor settings

• Torque Output: Broad torque curve for continuous-duty operation

Common Applications

• Marine engines powering fishing boats, tugs, ferries, and workboats.

• Industrial equipment such as pumps, generators, and compressors.

• Military use, historically powering landing craft and armored vehicles.

• Stationary engines for emergency power supply or water pumping stations.

The 4-valve configuration allows better airflow than the 2-valve version, improving efficiency and performance in demanding environments.

Overhaul Kits for Detroit Diesel 6-71 Non-Turbo 4V Engines

Inframe Overhaul Kits

1. Detroit 6-71 Engine Overhaul Kit – 1 Piece Piston
   Designed for natural (non-turbo) 6-71 engines equipped with a one-piece piston. Provides all major components required for an inframe rebuild, including pistons, liners, rings, bearings, and gaskets.

2. Detroit 6-71 Engine Overhaul Kit – 2 Piece Crosshead Piston
   Suited for 6-71 engines using a two-piece crosshead piston design. This configuration is often preferred in heavy-duty continuous service as it offers improved piston cooling and longer service life.

Both kits include:

• Cylinder liners

• Pistons (1-piece or 2-piece depending on configuration)

• Piston rings

• Wrist pins & retainers

• Connecting rod bearings

• Main bearings

• Full gasket set

These kits provide everything required to refresh the engine without removing it from service, minimizing downtime.

Cylinder Components for Detroit Diesel 6-71

• Cylinder Liner Puller Tool
  A must-have for removing worn liners safely and efficiently during rebuilds. Designed for use across the Series 53, 71, and 92 Detroit Diesel engines.

• Liner Inserts (Standard & Oversize)
  Available in standard thickness (0.1200–0.1205) and oversize (0.1212–0.1217). These inserts ensure proper liner seating and maintain critical clearances inside the block.

• Liner Shims
  Offered in .002 and .003 thicknesses, liner shims fine-tune liner height, ensuring proper piston-to-head clearance. Correct liner protrusion is essential for sealing and compression consistency.

Gasket Kits for Detroit Diesel 6-71

• Complete Overhaul Gasket Set
  Covers all sealing needs for the rebuild, including head gaskets, oil pan gaskets, valve cover gaskets, intake and exhaust gaskets, and seals for all accessory housings.

• Inspection Cover Gaskets
  Available individually for minor service tasks such as crankcase inspections without requiring a full gasket set.

Proper gasket sealing prevents oil, coolant, and fuel leaks while maintaining the engine’s compression and efficiency.

Crankshaft Seals & Sleeves

Seals are essential for preventing oil leaks at the crankshaft’s front and rear. Available in standard and oversize versions, as well as single-lip and double-lip designs.

• Front Seals: Standard universal fit for both left- and right-hand rotation engines.

• Rear Seals: Available in both single lip and double lip for varying sealing strength.

• Oversize Sleeves: Used with oversize seals to restore sealing surfaces on worn crankshafts.

Fuel System Components

• Primary & Secondary Fuel Filters
  Available in spin-on or cartridge types. Designed to protect injectors by removing contaminants and water from diesel fuel.

• Fuel Filter Removal Wrench
  Essential tool for safely servicing threaded filter housings.

Clean fuel delivery is critical in Detroit Diesel 6-71 engines, as injector tips and plungers operate at extremely high pressures with tight tolerances.

Lubrication System Components

• Oil Filters (Spin-On & Cartridge)
  Designed to maintain lubrication quality by capturing soot, metal particles, and impurities.

• Oil Filter Removal Wrench
  Heavy-duty tool for servicing both spin-on and cartridge filter housings.

Proper filtration ensures bearings, pistons, and turbochargers (in turbo engines) receive clean oil for extended service life.

Cooling System Parts

• Thermostats (173°F standard) for precise temperature regulation.

• Engine Block Heaters for cold-weather starting assistance.

• Radiator Cleaner formulated to remove scale, rust, and deposits from cooling passages.

Maintaining proper engine temperature prevents overheating and ensures efficient combustion.

Essential Tools for Rebuild & Maintenance

• Piston Ring Compressor for safe installation of rings into liners.

• Piston Ring Assembly Tool for Detroit Diesel and Cummins applications.

• Tune-Up Kit covering Series 53, 71, and 92 engines for precise adjustment of injectors and valve lash.

These tools reduce rebuild time, minimize the risk of component damage, and ensure factory-spec tolerances are met.

Additional Maintenance Parts

• Temperature Switches for monitoring coolant temperature.

• Paint & Primers including authentic Detroit Diesel Green paint for restorations.

• Mechanical & Electric Gauges (12V and 24V) for accurate monitoring of oil pressure, coolant temperature, and other parameters.

Why Choose Diesel Pro Power for Detroit Diesel 6-71 Parts?

Global Shipping: Diesel Pro Power ships Detroit Diesel 6-71 parts to over 180 countries, ensuring operators worldwide can get what they need quickly. Orders are typically processed and dispatched within 24 hours, reducing downtime whether your vessel is docked in Miami, operating in the Pacific, or powering industrial equipment in remote locations.

Trusted Supplier: With more than 40,000 satisfied customers worldwide, Diesel Pro Power has built a reputation as the go-to supplier for Detroit Diesel components. Our customer base ranges from small fishing boat operators to large commercial fleets, shipyards, and industrial facilities. This trust has been earned through consistent product quality, excellent customer service, and reliable logistics.

Specialized Support: Unlike many general auto-parts suppliers, Diesel Pro Power focuses exclusively on marine and industrial diesel applications. This specialization means our team understands the unique demands of continuous-duty engines like the Detroit Diesel 6-71. Whether you’re rebuilding a natural 4-valve configuration for a tugboat or maintaining a generator set, our expertise ensures you get the right part every time.

Comprehensive Catalog: Diesel Pro Power provides a one-stop shop for every component you need to keep your 6-71 running. From complete overhaul kits, gasket sets, and cylinder liners to filters, seals, and gauges, all critical parts are available in one place. This eliminates the hassle of sourcing components from multiple vendors and ensures compatibility across your rebuild or maintenance project.

Expert Guidance: Our team goes beyond simply selling parts—we help you select the correct kit for your specific engine configuration. The Detroit Diesel 6-71 was produced in multiple variations, including 1-piece vs. 2-piece pistons and 2-valve vs. 4-valve heads. Choosing the wrong kit can lead to costly downtime and compatibility issues. Diesel Pro Power’s experts guide you step by step, making sure you order exactly what you need for a successful rebuild.

Added Value: Beyond parts, Diesel Pro Power offers technical resources, easy-to-navigate online catalogs, and responsive customer support. With competitive pricing, dependable quality, and quick delivery, we provide not only the parts but also the confidence needed to keep Detroit Diesel 6-71 engines in peak condition.