Parts for Detroit Diesel 12V71 Non-Turbo for Australia - Blower Section

Parts for Detroit Diesel 12V71 Non-Turbo – Blower Section

The 12V71 is a classic two-stroke Detroit Diesel workhorse. On naturally aspirated (non-turbo) versions, the Roots-type blower is the heart of the scavenging system—moving air into the airbox so each cylinder can breathe, burn clean, and make reliable power. This section brings together the core blower assembly plus every seal, gasket, coupling, shaft, and supporting air-intake item you need to service or fully refresh the blower system on a 12V71. While several items may also fit 6V71 applications, guidance below is focused on the 12V71.

Rebuilt Blower (12V71 / 6V71)

Our rebuilt blower is torn down, cleaned, inspected, and reassembled with new wear components and precision-timed rotors for proper air delivery and long service life. It’s sold with a refundable core deposit—send your old unit back after install and keep your downtime to a minimum. Replacing a tired blower cures hard starts, excessive smoke at idle, and low power due to poor scavenging.

Blower Oil Tube Assemblies (12V71)

Two common feed sizes are used on Series 71 blower oiling: 1/4" x 1/8" and 1/8" x 1/8". Match the tube to your engine’s existing fittings to ensure correct lubrication to the blower drive and bearings. A fresh, correctly sized tube eliminates seeping lines, keeps oil where it belongs, and protects the blower from avoidable wear.

Series 71 Blower Repair Kit (Natural Engines)

The natural (non-turbo) kit packages the core consumables for an in-frame reseal: bearings, seals, gaskets, and related small parts. Use it when end play is within spec but leakage or age has the blower due for a refresh. A resealed unit restores airbox pressure, stabilizes idle quality, and reduces oil mist in the intake stream.

Blower Installation Gasket Kits for 12V71

The 12-cylinder layout typically runs two blowers—so a dual-blower installation kit makes sense during top-end service. It includes the critical interface gaskets you’ll need during removal and refit. If you’re only servicing one side, grab the single-unit gasket where appropriate. Premium materials resist heat, oil, and pulsing pressure at the blower base and covers.

Air Inlet & Airbox Sealing Components

• Air Inlet Housing Gasket: Ensures a leak-free transition from the cleaner/silencer to the blower inlet.

• Blower-to-Block & Striker Plate Gaskets: Maintain airtight joints at the base; essential for holding scavenging pressure.

• End-Plate Gaskets (two per blower): Replace any time the end covers come off to prevent seepage and pressure loss.

• Governor Cover Gaskets (spring and top): Keep the governor side clean and leak-free for consistent response.

• Hydraulic Governor Interface Gasket: Seals the governor to drive housing—replace on any governor removal.

Couplings, Hubs & Shafts (Thin 48-Spline Focus)

The 12V71 commonly uses thin 48-spline blower drives. We stock:

• Blower Coupling (thin 48-spline): Smooth power transfer from gear train to blower.

• Coupling Hub & Hub Plate: CNC-true pieces for precise fit; replace when spline wear or fretting is found.

• Accessory Drive Hub (thin 48-spline): For engines driving a hydraulic pump off the blower gear—verify your spline and hub style before ordering.

• Blower Shafts for 12V71: Standard 5.00" length and a 5.86" marine length version commonly used with Allison marine gears. Measure your existing shaft and setup to choose correctly.

• Shaft Retainer: Prevents axial movement of the shaft under load; replace when doing seals/bearings.

Drive Hardware: Chain, Sprockets, Clamps & Bearing

12V71 blower drive components wear gradually; replacing them together reduces noise and harmonics:

• Blower Chain (12V71): A fresh chain helps maintain accurate timing and reduces chatter.

• Rear Drive Sprocket & Engine Sprocket: Renew with the chain to avoid accelerated wear.

• Drive-Cover Clamp & Seal: Keeps the drive cover sealed against oil leaks; swap the clamp if distorted.

• Washer-Shaped Bearing (Accessory & Blower Gear Drive): Quiet operation and proper gear alignment depend on this little part—replace any time you see wear tracks.

Air Intake & Airbox Components

• Marine Silencer: Cuts intake roar without strangling airflow—ideal for cabin comfort on marine 12V71s.

• Industrial Air Cleaners (5" inlet, multiple heights): Choose size by available space and service interval goals.

• Air Box Breather Valve & Air Box Kit (12V71): Maintains the correct pressure gradient in the airbox and refreshes common wear items. Keeping the airbox tight boosts scavenging, reduces haze, and supports cleaner combustion.

Electrical & Controls Essentials

• Shutdown Solenoids (12V and 24/32V): Critical safety devices that reliably trip the air-shutdown when needed. Replace weak or intermittent solenoids to protect the engine.

• Teleflex Morse Cable Terminals (ball joint & clevis for 43C cables): Ensure positive, slop-free governor/throttle control—especially important on multi-station marine controls.

Finishing & Assembly Aids

• Detroit Green Engine Paint: Restore that factory look after service.

• High-Tack Gasket Spray: Helps position and seal cut gaskets on vertical surfaces and tight spots, improving first-start seal integrity.

Why Buy From Diesel Pro Power

Expertise in Detroit Diesel V-71 Platforms

We live and breathe Detroit Diesel. Our specialists understand the 12V71’s dual-blower layout, the thin 48-spline drive nuances, and the common marine Allison-gear variations—so you get the right parts the first time.

Proven Quality, Trusted by 40,000+ Customers

From rebuilt blowers to tiny gaskets, every item is vetted for fit and durability. Professionals worldwide rely on us to keep legacy Detroits running strong.

Fast Global Shipping to 180 Countries

Whether you’re dockside or on a remote job site, we ship quickly and securely so your 12V71 is back in service with minimal downtime.

Clear Core & Support Policies

Blower core returns are straightforward, and our tech team is here with practical, model-specific guidance for a smooth install.