Billet Alternator Pulley Half, for VW, Polished

OVERVIEW

When it comes to the heart of your air-cooled Volkswagen''s charging system, the pulley is often an overlooked component that can make or break both performance and aesthetics. The EMPI Billet Alternator Pulley Half is precision-engineered to replace the standard, stamped-steel outer half of your 12-volt generator or alternator pulley. Unlike the stock units that can warp or develop a "wobble" over years of high-heat cycles and constant belt tension, this billet aluminum version offers superior rigidity and structural integrity. Its high-luster polished finish adds a professional, show-ready appearance to your engine bay, making it an essential upgrade for anyone looking to bridge the gap between reliable daily driving and competitive show quality. Whether you are building a high-performance street machine or a rugged off-road dune buggy, this pulley half provides the durability and style that air-cooled enthusiasts demand.

Beyond its striking visual appeal, the technical advantages of a CNC-machined billet component cannot be overstated. Standard pulleys are often prone to minor imperfections in balance, which can lead to premature bearing wear on your alternator or generator at high RPMs. By utilizing this billet aluminum half, you ensure a more consistent rotational mass and a truer belt path. This component is designed to work seamlessly with your existing inner pulley half and standard adjustment shims, allowing you to maintain the factory-correct belt tensioning method that has kept VWs on the road for decades. It is a simple "bolt-on" modification that provides immediate peace of mind, knowing that your belt is riding on a precision-surfaced face that resists the grooving and pitting common in older, rusted steel components. Upgrade your charging system with the strength of billet and the shine of a mirror-polished finish.

FITMENT

• VW Beetle: 1967-1977 (12-Volt Models)
• VW Karmann Ghia: 1967-1974
• VW Type 2 Bus: 1967-1971 (1600cc Engines)
• VW Thing: 1973-1974
• VW Squareback/Fastback: 1967-1973 (Type 3)
• Custom Applications: All Dune Buggies, Sand Rails, and Trikes utilizing a VW Type 1 12V Generator or Alternator setup.

SPECS

• Material: High-Grade 6061-T6 Billet Aluminum
• Finish: Mirror Polished Surface
• Compatibility: Fits Standard 12-Volt Alternators and Generators
• Design: Outer Pulley Half (Replaces OEM Stamped Steel Half)
• Part Number: 4546-15
• Shipping Weight: 0.45 lbs
• Machining: CNC Precision Lathe-Cut for Perfect Balance
• Belt Type: Designed for standard 9.5mm x 905mm or 10mm x 900mm V-belts

PRO TIPS

1. Master the Shim Stack Technique

The key to belt longevity on a VW engine is proper tension, which is controlled entirely by the shims located between the two pulley halves. When installing your new billet pulley half, you must ensure you are using a total of 10 shims. If you remove shims from between the halves to tighten the belt, those extra shims MUST be placed on the outside of the pulley, underneath the nut. If you do not use all 10 shims, the pulley nut may bottom out on the shaft before the pulley is actually clamped tight, leading to a sheared woodruff key or a ruined alternator shaft.

2. Torque and Re-Torque for Safety

Aluminum expands and contracts at a different rate than the steel shaft of your alternator. When installing this pulley, use a dedicated pulley holding tool to torque the 21mm nut to approximately 40-45 ft-lbs. Do not use an impact wrench, as this can damage the internal windings of the alternator or crack the billet aluminum. After the first 50 to 100 miles of driving, always re-check the nut for tightness. As the belt seats into the new polished surface, the tension may slightly change, requiring a quick adjustment to keep everything running true.

3. Maintain the Mirror Finish

To keep your engine bay looking its best, avoid using harsh, acidic wheel cleaners or heavy degreasers on this polished aluminum pulley. These chemicals can cloud the finish instantly. Instead, use a mild soap and water for cleaning, followed by a dedicated