Parts for Detroit Diesel 471 Turbo - Blower Section

Parts for Detroit Diesel 4-71 Turbo – Blower Section

The Detroit Diesel 4-71 Turbo marries the proven Series 71 two-stroke platform with turbocharging for stronger mid-range torque and improved efficiency. Even with a turbo, the Roots-type blower remains essential to scavenging—sweeping out exhaust and packing in fresh air. Keeping the blower, drive, and sealing surfaces in top condition preserves turbo response, airbox pressure, and overall engine longevity. This section brings together rebuilt LH/RH blowers plus all the gaskets, shafts, couplings, tubes, and accessories you need for a clean, reliable installation.

Rebuilt 4-71 Turbo Blowers (Left-Hand & Right-Hand)

Select the orientation that matches your engine and front-end accessories:

• Left-Hand (LH) Blower – Mounted on the left side when viewed from the flywheel.

• Right-Hand (RH) Blower – Mounted on the right side when viewed from the flywheel.

Each rebuilt unit is fully torn down, cleaned, and inspected, then assembled with new bearings, seals, and gaskets. Rotor timing and end clearances are set to factory spec so the blower works in harmony with the turbo—delivering crisp throttle response, strong scavenging, and stable idle. Units are sold with a refundable core deposit for cost efficiency and sustainability.

Fitment tip: Match your original LH/RH orientation to keep governor linkage, intake ducting, and accessory drives aligned without extra fabrication.

Turbo-Grade Blower Repair & Installation Kits

Blower Repair Kit – Series 71 (Turbo)

A focused refresh for turbocharged applications. Replacing bearings, seals, and end gaskets restores pressure integrity, reduces rotor leakage, and quiets gear mesh—critical for maintaining turbo spool and clean airbox pressure on a 4-71 Turbo.

Blower Installation Gasket Kit – 4-71

Precision-cut gaskets sized for the 4-71 keep the blower-to-block interface airtight and oil-tight. Correct stack height preserves rotor clearances and helps the turbo maintain consistent boost.

Coupling, Shafts & Drive Hardware

Blower Coupling (Thin 48-Spline)

This precision coupling links the accessory/gear drive to the blower input. A true, concentric fit minimizes backlash and vibration, protecting front bearings and preserving blower timing under load.

Blower Shafts for 4-71

Choose the length that matches your front cover and hub stack:

• ~7.81" length – Common short stackup.

• ~8.68" length – For intermediate-reach covers.

• ~8.87" length – For deeper covers/hub combinations.

Using the correct length maintains full spline engagement, prevents edge-loading, and keeps alignment true with couplings and hubs.

Blower Shaft Retainer

Locks axial position so the shaft can’t “walk” from heat cycles or thrust loads—cheap insurance against costly gear damage.

Accessory / Hub Components

• Hydraulic Pump Drive Hub (in-line 71) – Couples the blower shaft to an aluminum hydraulic pump used on many marine/industrial rigs.

• Hub for Blower Rotor Gear – Maintains precise gear fit and rotor timing for quiet, efficient operation.

Lubrication & Oil Supply Tubes

• Tube to lubricate blower drive bearing – Ensures a steady oil feed to the drive bearings; crucial for long life at sustained RPM.

• Oil supply tube for governor drive – Keeps the governor drive lubricated, supporting a stable idle and consistent speed control.

Service note: Replace hardened tube seals and verify clean passages whenever the blower or governor drive is off the engine.

Gaskets for Turbo Airbox Integrity

Airtight sealing is mandatory on two-stroke turbos. Refresh these during any blower service:

• Blower drive gear cover gasket – Seals the gear cavity from the airbox.

• Blower screen gasket (4-71) – Seats the inlet screen and keeps debris out of the rotors.

• Blower-to-block gasket (4-71) – The primary airbox seal; critical for maintaining pressure and airflow on turbo setups.

• Governor gaskets (drive, housing, spring cover, cap) – Keep oil in and air out for clean operation and steady governing.

Seals, Sleeves & Drive Cover Hose

• Blower oil seal – Prevents oil migration into the intake charge; essential for clean turbo operation.

• Seal sleeve (Series 71/92) – Restores a smooth sealing surface if the original shaft is grooved.

• Blower drive cover hose (~2.75" × ~0.95") – Replace aged rubber to eliminate seeps and keep the front cover area clean.

Air Management & Controls

• Air Box Breather Valve Assembly – Manages crankcase ventilation into the airbox to reduce oil carry-over and keep the intake charge clean.

• Hydraulic Governor Gasket – Thin interface gasket that prevents oil migration and stabilizes idle quality.

• Shutdown Solenoids – 12V and 24/32V – Provide positive fuel cut for routine and emergency shutdowns, protecting engines and driveline equipment.

Control Cable Terminals (Marine)

• Teleflex/Morse Ball-Joint Terminal (¼", 43C) – Swiveling end for smooth governor/throttle geometry.

• Teleflex/Morse Clevis Terminal (¼", 43C) – Rigid, lash-free pin joint where a positive connection is preferred.

Corrosion-resistant construction stands up to salt and humidity; replacing worn ends eliminates throttle slop and surging.

Appearance & Assembly Aids

• Detroit Green Engine Paint – The classic finish; also helps spot fresh leaks after service.

• High-Tack Gasket Spray – Improves adhesion of paper/composite gaskets around the blower, airbox, and covers—especially helpful on seasoned castings.

Why Buy From Diesel Pro Power

Turbo-Correct Parts. Factory-Correct Fit.

From thin-spline couplings and the right-length shafts to turbo-grade repair and install kits, every component here is curated for the 4-71 Turbo platform. Expect easy installs, preserved rotor timing, and dependable sealing.

Expertise That Saves Time

Our team knows classic Detroits. Need help confirming LH vs. RH, choosing shaft length for your cover, or selecting the right gasket stack for a turbo airbox? We’ll get you the right parts on the first try.

Fast Global Shipping

We serve fleets, shipyards, and shops in 180 countries, minimizing downtime with rapid, trackable delivery.

Trusted by 40,000+ Customers

Professionals rely on our quality checks, clear documentation, and responsive support to keep their Series 71 turbos running strong.

One Source. Complete Blower Coverage.

Rebuilt blowers, turbo-ready install kits, couplings, shafts, hubs, breather valves, governor gaskets—everything for the blower system in one place.