Mounting Kit WP Pulley Shims / Bushings/ Bolts

The Jones Racing Products Mounting Kit WP Pulley Shims, Bushings, and Bolts (part number WP-5104-MK) is a precision engine accessory designed for water pump pulley alignment and installation on applications requiring 5/8-inch and 3/4-inch shaft compatibility. This three-piece aluminum shim set delivers the exact thickness control needed to achieve proper pulley concentricity and eliminate harmonic imbalance issues that compromise belt life and bearing longevity in high-performance and stock engine builds.

Each shim measures 0.063 inches thick and is machined from durable aluminum, naturally finished to resist corrosion during installation and long-term engine bay exposure. The dual-shaft design accommodates both 5/8-inch and 3/4-inch pulley bores, eliminating the need to stock multiple kit variations. The included bolts provide secure fastening without risk of shaft slippage during engine operation. Weighing just 0.11 pounds, the complete kit remains compact enough for tool roll storage while delivering measurable improvements in drivetrain reliability.

This mounting kit serves engine builders, hot rodders, and performance technicians who require precise pulley alignment during water pump installation. Proper shim selection prevents common failures including belt tracking issues, premature wear on pump seals, and vibration-induced fastener loosening. The set format allows stacking for applications requiring cumulative thickness adjustment beyond single-shim capacity, making it suitable for both bolt-on restorations and custom engine configurations where OEM hardware is unavailable or inadequate for modern coolant flow demands.