Parts for Detroit Diesel 371 Non-Turbo - (4 Valve Head Type) - Blower Section

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

The Detroit Diesel 3-71 Non-Turbo engine is one of the earliest and most reliable members of the Series 71 family, designed for consistent power delivery in industrial, marine, and generator applications. Like all two-stroke Detroits, the 3-71 depends entirely on its Roots-type blower to perform the critical scavenging process — clearing exhaust gases and packing in fresh air for combustion. Without a properly operating blower, the 3-71 cannot breathe efficiently, making this component the centerpiece of engine performance and longevity.

This catalog includes every part necessary to rebuild, replace, or service your blower system — from fully rebuilt blowers and shafts to coupling hubs, gaskets, seals, tubes, and governor fittings.

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Rebuilt Blowers for 3-71 Engines

Left-Hand Rebuilt Blower

This Detroit Diesel 3-71 Left-Hand blower mounts on the left side of the engine and is remanufactured to factory standards. Each unit is disassembled, cleaned, and fitted with new bearings, seals, gaskets, and properly timed rotors. The result is a unit that delivers strong, even air delivery across all RPM ranges.

All blowers are sold with a refundable core deposit , allowing customers to return their used blower for a credit. Each unit is performance-tested to ensure correct rotor clearances, smooth operation, and proper scavenging efficiency.

Right-Hand Rebuilt Blower

The Right-Hand 3-71 blower serves engines configured with opposite rotation or accessory layouts. Like the left-hand version, it’s rebuilt to OEM specifications with precision-timed rotors and balanced shafts. The result is reliable, leak-free performance and extended service life.

Note: Always confirm rotation before ordering — incorrect orientation can affect gear timing and air routing.

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Blower Repair & Installation Kits

Blower Repair Kit – Series 71

The Detroit Diesel Blower Repair Kit for Series 71 engines provides all necessary internal seals, bearings, and gaskets to restore your blower’s performance. Over time, seals can dry out or leak, and bearings may wear, reducing air pressure. This kit is engineered to eliminate those problems and return your blower to peak performance.

Blower Installation Gasket Kit for 3-71

The 3-71 Blower Installation Kit contains all the correct gaskets to reseal your blower to the block, airbox, and front drive housing. Each gasket is precision-cut for an airtight fit that maintains scavenging pressure, preventing air leaks that could cause poor combustion or smoke.

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Blower Coupling, Shaft & Hub Components

Blower Coupling (Thin 48-Spline Shaft)

The blower coupling transfers rotational torque from the accessory or gear drive to the blower input shaft. A tight-fitting coupling ensures precise timing and quiet operation. Designed to OEM standards, this part eliminates slippage and misalignment.

Blower Shaft Retainer

This small yet vital retainer locks the blower shaft in position, ensuring consistent gear engagement and preventing thrust movement. Replace this part anytime the blower is serviced or removed.

Blower Rotor Gear Hub

The hub for the blower rotor gear connects the timing gears to the rotor assembly, maintaining synchronization between the lobes. A worn hub can cause noise or even internal damage, so it should always be inspected during rebuilds.

Blower Shafts – 6.18" and 7.08"

The blower shaft connects the drive coupling to the rotor assembly. Two lengths are available:

• 6.18" – Standard for most 3-71 applications.

• 7.08" – For alternate drive cover configurations.

Both are precision-machined for tight spline engagement and balanced to prevent vibration.

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Lubrication & Oil Feed Components

Tube Assembly – Blower Drive Bearing

Ensures a consistent oil feed to the blower’s drive-end bearings. Proper lubrication is critical to prevent premature bearing wear and rotor seizing.

Oil Supply Tube – Governor Drive

Supplies steady lubrication to the governor drive assembly, ensuring smooth, consistent throttle response and preventing oil starvation.

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Gaskets & Seals

Air integrity is the key to maintaining efficiency in a two-stroke engine. Replace gaskets and seals during any blower service to keep air pressure stable.

• Blower Drive Gear Cover Gasket – Seals the blower gear cover to prevent oil leaks.

• Blower Screen Gasket (3-71) – Prevents contaminants from entering the blower inlet.

• End Plate Gaskets – Fit older-style blowers and ensure airtight rotor housing.

• Governor Gaskets – A complete range including drive, housing, cap, and spring cover gaskets — all essential for maintaining oil integrity.

• Blower Seal (Series 71) – Keeps lubrication oil separate from the airbox to prevent oil carryover into the intake.

• Seal Sleeve (Series 71/92) – Creates a smooth sealing surface when shafts show wear.

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Air Intake & Silencing Components

Industrial Air Cleaner (3" Inlet)

Designed for use in stationary or mobile power units, this air cleaner provides maximum filtration while minimizing airflow restriction. Clean intake air ensures longer life for pistons, liners, and blower rotors.

Marine Silencer

The Detroit Diesel marine silencer fits the 3-71 and other Series 71 engines, reducing intake noise without restricting airflow. Built from corrosion-resistant materials, it’s suitable for use in marine engine rooms and generator housings.

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Airbox Breather & Governor Components

Air Box Breather Valve Assembly

Regulates pressure in the airbox while minimizing oil mist and vapor carryover. Keeping the breather valve clean and operational helps stabilize engine idle and reduces crankcase pressure buildup.

Hydraulic Governor Gasket

Seals the connection between the governor and drive assembly, maintaining consistent oil pressure for smooth throttle control.

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Electrical Controls

Shutdown Solenoids – 12V / 24V

These shutdown solenoids cut fuel flow during engine shutdown or emergency stops. Built for continuous-duty environments, they are available in both 12-volt and 24/32-volt configurations. Each solenoid is vibration-tested and heat-resistant for long service life.

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Marine Control System Accessories

• Teleflex Morse Ball Joint Terminal (¼", Series 40) – Provides flexible throttle linkage movement.

• Teleflex Morse Clevis Terminal (¼", Series 40) – Offers a rigid mechanical link with zero play.

Both are compatible with 43C-style marine control cables and ensure accurate throttle or governor control on marine 3-71 installations.

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Finishing & Assembly Materials

• Detroit Diesel Green Paint – Restores the authentic factory look of your 3-71 engine while protecting against corrosion.

• High-Tack Gasket Spray Sealant – Helps paper and composite gaskets adhere securely and prevents air or oil leaks during assembly.

These finishing supplies add the final professional touch to your rebuild.

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Why Buy from Diesel Pro Power

Complete OEM-Quality Coverage

From the smallest gasket to complete rebuilt blowers, every part meets or exceeds factory specifications for fit and durability.

40,000+ Satisfied Customers

Trusted by professionals worldwide, Diesel Pro Power supports over 40,000 customers with reliable parts and expert assistance.

Fast Global Shipping

We deliver to over 180 countries , with fast order processing and real-time tracking to minimize downtime.

Expert Technical Support

Our team specializes in Detroit Diesel engines — ensuring that every customer gets the correct parts, the first time.

One-Stop Source for 3-71 Blower Components

All blower-related parts — from couplings and shafts to airbox gaskets and shutdown solenoids — are available in one place for convenience and confidence.

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