Parts for Detroit Diesel 371 Non-Turbo - (2 Valve Head Type) for Canada - Oil Pump Section

Parts for Detroit Diesel 3-71 Non-Turbo (2-Valve Head Type) — Oil Pump Section

The Detroit Diesel 3-71 Non-Turbo engine is part of the legendary two-stroke Series 71 family—an engine line known for its durability, simplicity, and versatility. The 3-71 in particular powered a wide range of industrial, marine, and generator applications, with a reputation for steady oil pressure and consistent performance under heavy loads. The heart of that reliability lies in its lubrication system—and at the core of that system is the oil pump assembly.

Below you’ll find a detailed catalog of premium-quality components designed specifically for the Detroit Diesel 3-71 Non-Turbo 2-Valve Head Type engine. These include rebuilt right-hand oil pumps, gaskets, shims, regulators, oil coolers, filters, dipsticks, and related seals—all tested and verified for fit and performance by Diesel Pro Power.

Each product in this catalog is backed by our commitment to quality, customer satisfaction, and fast worldwide delivery. With over 40,000+ satisfied customers, Diesel Pro Power is the most trusted online source for Detroit Diesel Series 71 engine parts.

Detroit Diesel 3-71 Oil Pump Assemblies

The oil pump in the 3-71 engine is responsible for maintaining consistent oil circulation through critical engine components. A strong and reliable oil pump ensures proper lubrication of bearings, camshafts, and connecting rods, preventing metal-to-metal contact and excessive heat buildup.

Rebuilt Right-Hand Oil Pump for Detroit Diesel 3-71 and 4-71 Engines
This rebuilt right-hand pump is meticulously remanufactured to factory standards, ensuring OEM performance at a fraction of the cost of new. The pump housing is precision-machined, pressure-tested, and fitted with new seals, gears, and bushings to deliver consistent oil pressure even in high-load environments.

Rebuilt Right-Hand Oil Pump for 3-71, 4-71, and 6-71 Engines
Designed for interchangeability within the Series 71 family, this rebuilt unit is suitable for multi-cylinder configurations. It provides balanced flow characteristics that ensure even oil distribution throughout the crankcase and head, maintaining the performance Detroit Diesel engines are known for.

Each rebuilt pump is sold with a refundable core deposit. This ensures environmental responsibility while allowing customers to save by returning their used core for recycling.

Gaskets for Oil Pump and Cover

Every oil pump installation requires a tight seal between the pump body and engine block. Diesel Pro Power offers precision-cut oil pump cover gaskets made from durable, oil-resistant materials to prevent leaks and maintain system pressure.

Gasket for Oil Pump Cover (Fits 3-71, 4-71, and 6-71 Engines)
Engineered to resist heat and oil degradation, this gasket fits the front cover of the pump assembly and prevents oil seepage under high pressure.

Alternate Oil Pump Cover Gasket (Fits Same Models)
An alternative gasket design with identical dimensions but constructed from a slightly thicker material, allowing for a perfect seal even on worn or resurfaced pump housings.

Replacing these gaskets during maintenance is a cost-effective way to restore oil pressure stability and prevent premature oil pump wear.

Oil Pump Shims

Oil Pump Shim for 3-71, 4-71, and 6-71 Engines
Oil pump shims are small yet crucial components that determine the pump’s precise alignment and pressure setting. These shims compensate for variations in housing thickness and ensure that the gear-to-cover clearance is maintained within Detroit Diesel specifications. Proper use of shims prevents cavitation and maintains steady flow rates.

Oil Pressure Regulator Valve Assembly

Oil Pressure Regulator Valve for Detroit Diesel 3-71, 4-71, and 6-71 Engines
The regulator valve is responsible for maintaining correct oil pressure by controlling the bypass flow. When oil pressure exceeds the specified limit, this valve opens slightly, diverting excess oil to the sump and protecting engine bearings. Diesel Pro’s regulator valves are built using hardened steel components and precision springs to provide stable, predictable pressure regulation under varying loads.

Gasket for Oil Pressure Regulator Valve
This gasket ensures a leak-free connection between the regulator valve housing and the oil gallery. Made from reinforced material, it withstands both high temperature and pressure cycles.

Oil Pump Repair Kit

Oil Pump Repair Kit for 3-71 and 4-71 Engines
This comprehensive kit includes internal components such as gears, shafts, seals, and bushings—everything required to rebuild your existing oil pump. Designed for technicians who prefer to refurbish their original assembly, the kit meets OEM performance standards and restores full oiling efficiency without needing to purchase a complete rebuilt unit.

Oil Cooler Assemblies and Components

Lubricating oil in a two-stroke engine like the Detroit Diesel 3-71 not only reduces friction but also helps remove excess heat from critical parts. The oil cooler is essential for maintaining optimal operating temperatures and preventing thermal breakdown of the oil.

Oil Cooler – 6 Plate Design
This compact cooler efficiently dissipates heat through six parallel plates, offering ideal cooling for lighter duty or single-engine configurations.

Oil Cooler – 8 Plate Design
For applications operating in high ambient temperatures or continuous heavy-load conditions, the 8-plate cooler offers enhanced surface area for superior heat exchange and consistent oil temperature control.

Oil Cooler Gaskets
Diesel Pro provides multiple gasket styles for the cooler housing and adapter, each precision-cut for a tight seal. These gaskets are compatible with marine and industrial installations and are vital for preventing leaks between the cooler body, adapter, and oil passages.

Oil Cooler Tube Gasket and O-Ring Seal
The tube gasket and O-ring seals prevent coolant and oil cross-contamination. Each seal is tested for marine endurance and high-temperature resistance.

Oil Cooler Adaptor Gasket
Designed for marine engines, this gasket fits between the block and oil cooler adapter. It maintains pressure integrity even under extended idling or variable temperature conditions.

Oil Pan Components

Oil Pan Gasket for Detroit Diesel 3-71 and V-Series Engines
The oil pan gasket prevents leaks between the crankcase and the oil pan, ensuring oil remains contained within the lubrication system. Diesel Pro’s gaskets use a durable composite material that resists heat cycling and vibration, guaranteeing long-term reliability.

Oil Filter Assemblies and Adaptors

The Detroit Diesel 3-71 Non-Turbo engine originally used a cartridge-style oil filter, though many operators upgrade to modern spin-on filters for convenience.

Oil Filter Base for Cartridge-Type Filters
Machined for durability, this base accommodates standard cartridge elements and includes precision-cut threads for reliable sealing.

Oil Filter Adaptor – Cartridge to Spin-On Conversion
This popular conversion kit allows owners to switch from traditional cartridge filters to modern spin-on filters. The spin-on design simplifies maintenance, reduces service time, and ensures consistent filtration. Compatible with both Detroit Diesel and Allison transmission applications.

Gasket for Oil Filter Adaptor
This gasket ensures leak-free installation of the adaptor assembly.

Copper Washers and Seals
Copper washers provide reliable sealing for oil fittings and pressure lines, ensuring no loss of pressure through joints and fittings.

Oil Filters and Maintenance Tools

Spin-On Oil Filter
Premium spin-on filters deliver clean oil flow, trapping contaminants such as metal particles and soot. Diesel Pro offers filters compatible with both Detroit Diesel and Cummins engines, maintaining consistent filtration under high flow conditions.

Cartridge-Type Oil Filter
For those retaining the classic setup, the cartridge-type filter offers proven reliability. Made with high-grade media for excellent dirt-holding capacity.

Oil Filter Removal Wrench
A professional-grade tool designed to remove or tighten spin-on filters ranging from 4-21/32" to 5-5/32" diameter—ideal for Detroit Diesel, Caterpillar, and Cummins applications.

Dipsticks, Tubes, and Related Components

Oil Dipstick (61-Inch and 72-Inch Versions)
Detroit Diesel dipsticks are used to accurately measure engine oil levels. Available in two lengths to accommodate various configurations, including marine and industrial installations.

Dipstick Tube
This steel tube connects the crankcase to the dipstick handle, allowing easy access while maintaining an airtight seal.

Dipstick Guide
The guide ensures proper alignment and sealing of the dipstick, preventing oil from splashing out during operation.

Oil Filler Cap for Head Cover
This cap seals the filler opening, keeping contaminants out while allowing for easy refilling during maintenance.

Oil System Seals and Water/Oil Manifold Interfaces

Valve for Oil Pressure Regulator
An essential component of the oil pressure control assembly, ensuring the system maintains correct relief pressure.

Water Seals for Oil Cooler and Manifold Connections
Several seals are used where the oil cooler interfaces with the water manifold. These seals are designed to withstand continuous exposure to oil, water, and temperature fluctuations. Diesel Pro’s seals feature reinforced lips for a tight, long-lasting fit.

Water Manifold to Oil Cooler Housing Seals (2-1/2" and 2-3/4")
These seals provide watertight connections between the manifold and cooler housing, crucial for marine engines that rely on raw water cooling systems.

Pressure Switches and Monitoring Components

Maintaining proper oil pressure is critical for two-stroke engine longevity. Diesel Pro offers several calibrated fuel and oil pressure switches that integrate into your monitoring system or alarm circuit.

5 PSI Make/Break Pressure Switch
Activates or deactivates electrical circuits based on oil pressure levels—ideal for warning systems or shutdown protection.

10 PSI Make/Break Pressure Switch
Used in systems requiring a slightly higher operating threshold, ensuring accurate oil pressure readings under load.

20 PSI Make/Break Pressure Switch
Designed for heavy-duty applications where higher base oil pressure is standard, such as generator or propulsion use.

Mechanical and Electric Gauges
Diesel Pro also carries a full line of mechanical and electrical gauges—12V and 24V options available—to monitor oil pressure, temperature, and other vital readings.

Why Buy Detroit Diesel 3-71 Oil Pump and Lubrication Components from Diesel Pro Power

Diesel Pro Power is more than a parts supplier—it’s the industry’s leading online destination for authentic Detroit Diesel components. With decades of expertise and over 40,000 satisfied customers worldwide, Diesel Pro ensures every part you receive is ready for immediate installation and guaranteed to perform.

Key Advantages:

• Expert-verified compatibility: Every component listed here is confirmed to fit the Detroit Diesel 3-71 Non-Turbo (2-Valve Head Type) engine.

• Rebuilt parts with warranty: Each rebuilt oil pump and assembly is tested for pressure, clearance, and flow before shipment.

• Comprehensive inventory: From oil pumps to shims, gaskets, coolers, and filters—all available in one place.

• Worldwide delivery: Orders ship fast from our U.S. distribution center to customers around the globe.

• Technical support: Our expert team assists with cross-references, installation guidance, and oil system troubleshooting.

• Real-time inventory: What you see online is in stock and ready to ship—no waiting, no backorders.