Alternator Drive Pulley 40T- Radius Tooth

The Alternator Drive Pulley 40T Radius Tooth by MOROSO (MPN 23558) is a precision-engineered crankshaft pulley designed for high-performance engine builds and custom automotive applications. This HTD (Hybrid Timing Drive) pulley synchronizes alternator and accessory belt drive systems with exact tooth engagement, eliminating belt slip and ensuring consistent accessory charging and cooling. Ideal for engine builders, performance enthusiasts, and restoration specialists, this pulley is essential for applications requiring reliable power transmission in demanding engine configurations.

Constructed from lightweight aluminum and finished in black anodized coating for corrosion resistance, the 40-tooth radius tooth design provides superior grip and load distribution compared to serpentine belts. The pulley features a 0.5-inch belt width tolerance, 0.59-inch shaft diameter compatibility, 1-inch mandrel specification, and 1/8-inch keyway for secure mounting. The radius tooth profile reduces belt wear and extends service life by distributing pressure evenly across each tooth, while the anodized finish protects against oxidation and UV degradation in engine bay environments.

This universal pulley benefits street rod builders, race engine technicians, and DIY restorers seeking OEM-quality alternator drive components. Installation requires precise shaft alignment and keyway engagement to ensure proper belt tension and synchronization with companion pulleys. Weighing only 0.75 pounds, it integrates seamlessly into compact engine compartments while maintaining the structural integrity needed for sustained high-RPM operation. Verify shaft diameter and keyway dimensions on your existing crankshaft assembly before purchase to ensure compatibility.