Parts for Detroit Diesel 371 Non-Turbo - (4 Valve Head Type) for Canada - Oil Pump Section

Parts for Detroit Diesel 3-71 Non-Turbo (4 Valve Head Type) – Oil Pump Section

The Detroit Diesel 3-71 engine, part of the renowned Series 71 family, represents the hallmark of classic two-stroke diesel design. Compact, rugged, and highly adaptable, the 3-71 engine has powered a wide range of applications, including industrial machinery, construction equipment, generators, and marine vessels. To maintain the longevity and peak performance of these engines, the oil system plays a critical role. The oil pump, gaskets, seals, filters, and related cooling components ensure consistent lubrication, stable oil pressure, and efficient temperature control throughout the engine’s life cycle.

Diesel Pro Power offers a complete selection of premium-quality oil system components designed for the Detroit Diesel 3-71 Non-Turbo (4 Valve Head Type) configuration. Each part—whether rebuilt, new, or remanufactured—meets or exceeds OEM specifications. With over 40,000 satisfied customers worldwide, Diesel Pro Power has become the trusted global source for Detroit Diesel parts, offering quick delivery, reliable customer service, and superior product quality for professionals across marine, industrial, and power generation sectors.

The Importance of the Oil Pump in the Detroit Diesel 3-71 Engine

The oil pump is the heart of the Detroit Diesel lubrication system. Its primary function is to circulate pressurized oil to all vital engine components—main bearings, camshaft bearings, connecting rods, rocker arms, and valve train assemblies. This ensures that metal surfaces stay properly lubricated to minimize friction, reduce wear, and carry heat away from high-load zones.

For a two-stroke diesel engine such as the 3-71, proper oil pressure is especially vital. The constant scavenging and exhaust cycles generate high operating temperatures, and without a steady oil flow, critical parts would seize or fail prematurely. The Detroit Diesel Right-Hand Oil Pump for the 3-71 Non-Turbo (4 Valve Head Type) is engineered for this exact function—reliable lubrication and pressure control under heavy-duty, continuous-use conditions.

Each rebuilt Detroit Diesel oil pump offered by Diesel Pro Power undergoes an extensive remanufacturing process. The housing is inspected for cracks, gear clearances are verified to meet factory tolerances, and all internal components are cleaned, polished, and replaced when necessary. This ensures that the oil pump delivers factory-grade performance at a fraction of the cost of new OEM parts.

Oil Pump Options Available for the Detroit Diesel 3-71 Non-Turbo Engine

Rebuilt Right-Hand Oil Pump for 3-71 and 4-71 Engines
This rebuilt oil pump is designed specifically for smaller Series 71 configurations, providing the correct flow rate and pressure for the 3-71 Non-Turbo setup. Built to last under the demanding conditions of both stationary and mobile diesel applications, it ensures a steady oil supply even at low idle and high-load RPMs.

Rebuilt Right-Hand Oil Pump for 3-71, 4-71, and 6-71 Engines
This version offers broader compatibility for operators managing mixed fleets of Series 71 engines. It features reinforced internal gearing and precision-machined surfaces to reduce internal leakage, maximizing oil delivery efficiency.

Rebuilt Right-Hand Oil Pump for 6-71 Engines (Heavy-Duty Specification)
Though larger in capacity, this oil pump is often chosen for modified or high-performance 3-71 setups where additional oil pressure or flow may be desired. It undergoes a high-tolerance rebuild process with upgraded seals and pressure testing to ensure reliability.

All rebuilt oil pumps are sold with a refundable core deposit, ensuring sustainable remanufacturing practices. The returned core allows Diesel Pro Power’s technicians to continue restoring original Detroit Diesel components with precision and consistency.

Supporting Components for the Detroit Diesel 3-71 Lubrication System

Proper maintenance of the oil system goes beyond the pump itself. To ensure complete reliability, operators should also replace associated gaskets, shims, seals, and filters during each service interval or overhaul.

Oil Pump Gaskets
Two gasket types are available for oil pump covers. These prevent leaks between the pump housing and the block. Even the smallest gasket failure can lead to reduced oil pressure or contamination. Replacing gaskets during pump installation is recommended to maintain full sealing integrity.

Oil Pump Shim
The oil pump shim is a critical calibration component for Series 71 engines. It ensures proper gear clearance within the oil pump assembly, affecting both oil pressure and volume. Using the correct shim thickness restores factory oil pressure values and prevents premature wear on pump gears and bearings.

Oil Pressure Regulator Valve and Gasket
The pressure regulator valve works in conjunction with the pump to maintain consistent oil pressure throughout varying engine speeds. Diesel Pro Power provides precision-built regulator valves and gaskets for Series 71 engines, ensuring stable operation under all conditions. A faulty regulator can cause oil pressure fluctuations that may result in engine overheating or bearing damage.

Oil Pump Repair Kit
For operators preferring to rebuild their own pumps, the Detroit Diesel Oil Pump Repair Kit includes replacement seals, gaskets, gears, and fasteners. This kit restores pump performance without requiring a complete replacement, reducing maintenance costs and downtime.

Oil Cooling System Components

Efficient oil cooling is essential to prevent thermal breakdown and to maintain the viscosity of the lubricant. The Detroit Diesel Oil Cooler for the 3-71 engine is available in both 6-plate and 8-plate configurations, depending on application requirements.

6-Plate Oil Cooler
Ideal for smaller or low-load operations, the 6-plate cooler offers compact design and steady temperature regulation.

8-Plate Oil Cooler
For heavy-duty or continuous-duty marine and industrial engines, the 8-plate cooler provides increased cooling surface area, maintaining optimal oil temperature during high-load cycles.

Accompanying gaskets for both coolers ensure leak-free connections between the oil cooler, housing, and block. Diesel Pro Power offers several gasket variations—each crafted from heat-resistant materials suitable for both land-based and marine applications.

Oil Cooler and Adaptor Seals

The oil cooler system relies on multiple seals to ensure smooth oil flow and prevent water intrusion in marine applications.

• Gaskets for Oil Cooler Tube and Adaptor: These gaskets create tight seals at every interface point of the oil cooler assembly.

• O-Ring Seals for Oil Cooler Tube: Designed specifically for marine engines, these seals prevent cross-contamination between oil and seawater circuits.

• Oil Pan Gasket: Ensures complete sealing at the oil pan, preventing leaks that could lower oil levels and endanger engine lubrication.

Each of these seals should be replaced during any major service or oil cooler replacement to guarantee continued protection of the lubrication system.

Oil Filtration Components

Proper oil filtration is crucial for maintaining the longevity of the Detroit Diesel 3-71 engine. Diesel Pro Power offers both spin-on and cartridge-type oil filters, along with bases, adaptors, and gaskets to fit your configuration.

Oil Filter Base (Cartridge Type)
This durable base accommodates the traditional cartridge-style filter used in earlier Series 71 engines. Machined for precise alignment, it ensures leak-free filter installation.

Oil Filter Adaptor (Cartridge to Spin-On Conversion)
Many owners choose to convert older engines to a spin-on filter system, simplifying maintenance and reducing mess during oil changes. Diesel Pro Power’s adaptor allows seamless conversion between cartridge and modern spin-on systems, compatible with both Detroit Diesel and Allison transmission setups.

Oil Filters

• Spin-On Type Filter – Easy to replace and designed for high-flow filtration.

• Cartridge Type Filter – Premium design for older setups where OEM specifications are retained.

Both filter styles provide high-efficiency particle capture and long service life, protecting engine bearings, camshafts, and gears from abrasive contaminants.

Oil Filter Removal Wrench
To complement filter replacement, Diesel Pro Power offers an adjustable oil filter removal wrench designed for filters ranging from 4-21/32” to 5-5/32”. Built from industrial-grade steel, it provides a secure grip for removing even the tightest filters.

Dipsticks, Tubes, and Filler Caps

Proper oil level monitoring is vital for Series 71 engines. Diesel Pro Power provides several options for different engine installations and configurations.

• 61" Dipstick – Suitable for smaller installations or confined engine rooms.

• 72" Dipstick – Designed for deeper oil pans or remote-mounted engines.

• Dipstick Tube and Guide – Ensures accurate oil level readings and protects the dipstick from vibration and misalignment.

• Oil Filler Cap – A precision-fit 2” cap for head covers, made from durable alloy with a corrosion-resistant finish.

Regular oil level checks and use of high-quality seals prevent air intrusion or oil loss that could reduce pump performance.

Pressure Control and Monitoring Components

Maintaining precise oil pressure is essential to the longevity of the Detroit Diesel 3-71. Diesel Pro Power supplies high-accuracy switches, valves, and gauges designed for direct compatibility.

Pressure Regulator Valve and Internal Valve Component
The oil pressure regulator valve assembly controls excess oil flow and maintains steady system pressure. A separate internal valve component ensures responsiveness under rapid RPM changes.

Pressure Switches
Available in 5, 10, 20, and 27 PSI make/break options, these switches activate alarms or shutdown systems when oil pressure deviates from safe levels. Commonly used in marine panels or industrial safety circuits, these components are vital for preventing catastrophic engine failure.

Mechanical and Electrical Gauges
Operators can choose from mechanical gauges (standard or with alarms) and electrical gauges for 12V or 24V systems. Each gauge provides real-time oil pressure readings, allowing for preventive action if readings fall outside normal ranges.

Maintenance Tips for the Detroit Diesel 3-71 Oil System

1. Inspect Oil Levels Frequently: Low oil levels can quickly lead to bearing wear or seizure in two-stroke engines.

2. Replace Filters Every 100–150 Hours: Regular replacement keeps the lubrication system free of carbon and metal particles.

3. Monitor Oil Pressure Continuously: Sudden drops indicate pump or regulator issues that require immediate attention.

4. Use High-Quality Diesel Engine Oil: Always use lubricants meeting the SAE and API standards recommended for Detroit Diesel two-stroke engines.

5. Flush the Oil Cooler During Overhaul: Removing sludge and deposits helps maintain efficient heat transfer.

Following these guidelines ensures consistent lubrication and long-term reliability.

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

When it comes to maintaining a Detroit Diesel engine, quality and dependability are everything. Diesel Pro Power stands apart as the most trusted global distributor for Series 71 engine parts, offering unmatched technical expertise and exceptional service standards.

Advantages of Choosing Diesel Pro Power

• Over 40,000 satisfied customers worldwide.

• All components are inspected and tested for accuracy, pressure performance, and fitment.

• Rebuilt oil pumps undergo complete disassembly, ultrasonic cleaning, re-machining, and final quality control testing.

• Fast worldwide shipping from a U.S.-based warehouse.

• Bilingual support and dedicated technical assistance for marine, industrial, and power generation customers.

• 24/7 secure online ordering with real-time stock visibility.

By choosing Diesel Pro Power, you are investing in more than just a part—you’re ensuring your Detroit Diesel 3-71 Non-Turbo engine continues to perform at its designed reliability and efficiency for years to come.