Parts for Detroit Diesel 671 Non-Turbo (2 Valve Head Type) – Oil Pump Section

The Detroit Diesel 671 Non-Turbo (2-Valve Head) engine represents one of the most proven and widely used diesel powerplants ever produced by General Motors. From its introduction in the mid-20th century, the inline-six configuration became a cornerstone in both marine and industrial applications, known for its rugged dependability, high torque output, and simple mechanical design. The 6-71 engine, with its signature two-stroke cycle and 2-valve configuration, powered countless vessels, trucks, and stationary equipment across decades of heavy service.

Proper oil circulation is critical to the life of these engines, and Diesel Pro Power provides every component necessary to maintain, rebuild, or optimize the oiling system. Whether you are working on a complete overhaul, replacing a worn pump, or upgrading the oil filtration setup, this catalog includes a comprehensive list of genuine and remanufactured parts specifically for the Detroit Diesel 671 Non-Turbo (2-Valve Head) engine.

Overview of the Detroit Diesel 6-71 Lubrication System

The lubrication system of the Detroit Diesel 6-71 Non-Turbo engine is a full-pressure, gear-driven oiling circuit designed to provide consistent flow to all critical components — bearings, piston pins, valve gear, blower, and governor. The engine’s oil pump is located in the lower section of the block, drawing oil from the pan and distributing it through internal passages and filters before returning it via drain passages.

Because these engines operate under heavy load conditions, consistent oil pressure is essential. Variations can lead to bearing wear, camshaft scoring, and turbo or blower damage (in turbocharged versions). For the naturally aspirated two-valve configuration, maintaining correct pressure and flow ensures reliable operation across a wide range of RPMs, from idle to full throttle.

Oil Pumps for Detroit Diesel 6-71 Non-Turbo Engines

Rebuilt Oil Pumps – Right-Hand Rotation

Diesel Pro Power offers rebuilt right-hand rotation oil pumps specifically engineered for the 6-71 Non-Turbo engine. Each unit is fully remanufactured and bench-tested to meet original Detroit Diesel specifications. The gear clearances, shafts, and internal pressure valves are inspected and replaced where necessary to restore full hydraulic integrity.

These pumps are ideal for marine and stationary installations where the engine’s crankshaft rotation requires right-hand drive. Precision machining ensures smooth operation and balanced oil delivery, reducing parasitic load and improving fuel efficiency.

Oil Pump Variants and Compatibility

Several pump configurations are available depending on your engine’s build code and installation setup. Some models are interchangeable across the 3-71, 4-71, and 6-71 series, though the output pressure and mounting orientation must match the original design. Rebuilt versions are sold with refundable core deposits, reflecting Diesel Pro Power’s emphasis on sustainability and quality assurance.

Oil Pump Gaskets and Seals

Every oil pump installation requires the correct gaskets to ensure leak-free operation. The gasket between the oil pump body and cover prevents internal bypassing and external leakage, while high-temperature sealants help maintain consistent oil pressure. Diesel Pro Power carries precision-cut gaskets made from durable composite materials that resist oil saturation and heat degradation, ensuring long service life even under continuous operation.

Oil Pump Repair Kits

For technicians or operators wishing to rebuild their existing unit, Diesel Pro Power provides complete oil pump repair kits containing gears, seals, shafts, and thrust washers. These kits restore the internal efficiency of the pump and are designed for professional or in-house maintenance facilities. Rebuilding an oil pump using genuine-quality components guarantees that the engine maintains proper lubrication without premature pressure loss.

Oil Pressure Control Components

Oil Pressure Regulator Valves

The oil pressure regulator valve is one of the most critical components in the lubrication system. It controls system pressure by diverting excess oil back to the sump once the desired level is reached. A malfunctioning regulator can result in either excessive or insufficient oil pressure, both of which can cause catastrophic engine failure. Diesel Pro Power supplies premium regulator valves specifically designed for Detroit Diesel 6-71 engines, ensuring precise calibration and consistent performance.

Regulator Gaskets and Valves

Gaskets for the regulator assembly and replacement valve inserts are also available. These are essential during oil system servicing to maintain sealing integrity and prevent leakage from the housing. Each component is machined to OEM tolerances to match the Detroit Diesel 6-71 pressure control assembly.

Oil Cooling Components

Proper oil temperature regulation is as important as maintaining pressure. The Detroit Diesel 6-71 Non-Turbo engine relies on plate-type oil coolers to dissipate heat generated by the friction and combustion process.

Plate-Type Oil Coolers

Diesel Pro Power offers a range of oil coolers — 6-plate, 8-plate, 12-plate, and 13-plate versions — each suitable for different power outputs and installation configurations. The higher the plate count, the greater the cooling capacity, which is critical for marine applications where the engine operates under continuous load.

Each cooler is precision-brazed, pressure-tested, and corrosion-resistant. Marine versions are fitted with nickel-alloy or brass plates for improved saltwater durability.

Oil Cooler Gaskets and O-Rings

The oil cooler is attached to the block via gaskets and sealing rings that prevent leaks between coolant and oil passages. Diesel Pro Power supplies all necessary gaskets for the cooler body, tube adaptors, and water manifold housings. Using the correct seals ensures that oil and coolant remain isolated, preventing contamination that could lead to bearing or liner damage.

Water Manifold and Oil Cooler Seals

In marine configurations, the oil cooler connects directly to the water manifold housing. Special lip seals of varying diameters (2-inch, 2½-inch, and 2¾-inch) ensure a watertight interface, even under fluctuating thermal conditions. These seals feature high-temperature rubber compounds that maintain elasticity and integrity for thousands of operating hours.

Oil Pan Components

Oil Pan and Bottom Cover

The oil pan, sometimes called the sump or bottom cover, is responsible for storing engine oil before it is circulated by the pump. Diesel Pro Power provides both tin and cast styles, depending on the engine variant. Each is designed to resist vibration and distortion, ensuring consistent oil pickup at all angles.

Oil Pan Gaskets

To prevent leaks at the oil pan flange, Diesel Pro Power offers high-quality gaskets made of durable materials that withstand repeated heating and cooling cycles. These gaskets provide a reliable seal between the block and the pan, ensuring proper oil containment and pressure stability.

Oil Filtration Components

Oil Filter Bases

The original Detroit Diesel 6-71 Non-Turbo engine used a cartridge-style oil filter base. Diesel Pro Power offers both direct-fit bases and adaptor kits to convert older cartridge systems to modern spin-on filters. This upgrade simplifies maintenance, reduces service time, and ensures better contamination control.

Oil Filter Adaptors and Gaskets

Adaptor kits are designed for direct installation and come with the required gaskets to ensure a tight, leak-proof seal. Diesel Pro Power’s filter adaptors are machined from high-strength aluminum for corrosion resistance and weight savings.

Spin-On and Cartridge Filters

Both spin-on and cartridge-type oil filters are available. Spin-on filters provide a convenient modern solution with integrated anti-drainback valves, while cartridge filters remain compatible with original configurations. Each filter features fine-micron filtration media designed to capture soot, carbon, and metallic debris.

Oil Filter Removal Tools

For maintenance convenience, Diesel Pro Power supplies adjustable oil filter removal wrenches suitable for Detroit Diesel, Caterpillar, and Cummins engines. These professional-grade tools allow quick and safe removal without damaging the filter housing or seals.

Measurement and Monitoring Components

Dipsticks, Tubes, and Guides

Maintaining correct oil level is essential for engine health. Diesel Pro Power carries dipsticks in multiple lengths (commonly 61" and 72") to suit different installation configurations. Matching tubes and guides are also available to ensure a snug fit and accurate readings.

Each dipstick is designed for durability and corrosion resistance, ensuring reliable service even in marine environments where moisture exposure is common.

Pressure Switches and Gauges

For monitoring system health, Diesel Pro Power offers a variety of fuel and oil pressure switches in calibrated PSI ratings (5, 10, 20, and 27 PSI). These switches interface with alarms or indicator lights to warn operators of low oil pressure conditions.

In addition, both mechanical and electrical gauges — available in 12- and 24-volt systems — provide real-time feedback on oil pressure and temperature, ensuring operators can maintain safe operating conditions.

Supporting Components

Copper Washers and Seals

Copper sealing washers are used throughout the lubrication system to secure fittings, pressure lines, and plugs. Their malleable construction allows them to conform tightly to mating surfaces, ensuring leak-free connections under pressure. Diesel Pro Power provides correctly sized washers specifically for Detroit Diesel oil systems.

Water Seals and O-Rings

Water seals between oil cooler and manifold housings are also available in multiple diameters. These components are designed to prevent cross-contamination between oil and cooling circuits. Every O-ring and lip seal is made from premium rubber compounds engineered for resistance to oil, fuel, and saltwater.

Additional Accessories and Related Items

Diesel Pro Power also carries accessories such as oil filler caps, valve housing covers, and spring-loaded assemblies for Allison M and MH marine transmissions, which interface directly with the Detroit Diesel 6-71 lubrication system in marine propulsion setups. These small but essential parts ensure proper oil circulation between engine and gearbox assemblies.

Why Choose Diesel Pro Power for Detroit Diesel 6-71 Oil System Components

For over four decades, Diesel Pro Power has supported professional operators, marine engineers, and fleet managers in keeping Detroit Diesel engines running at peak performance. With over 40,000 satisfied customers worldwide, Diesel Pro Power has built a reputation for accuracy, reliability, and unmatched customer service.

Key Advantages:

Expert-verified compatibility for the Detroit Diesel 6-71 Non-Turbo (2-Valve Head Type) engine
Fully remanufactured oil pumps and components tested for pressure and flow performance
High-quality gaskets, seals, and coolers for marine and industrial applications
Fast worldwide shipping from a centralized U.S. distribution facility
Dedicated support team for technical assistance and part identification
24/7 online ordering with real-time stock availability

Every oil pump, gasket, cooler, and regulator in this catalog has been selected for precision fit and long-term durability. Whether maintaining a fishing vessel, industrial generator, or vintage military power unit, Diesel Pro Power delivers the parts and expertise to keep your Detroit Diesel 6-71 engine operating at its best.

Detroit Diesel Oil Pan 6-71 - Tin

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