Inner Starter Shim For

The Inner Starter Shim for Powermaster starters is a precision aluminum spacer engineered to correct gear mesh and pinion depth on high-performance and street rod starter installations. When starter-to-engine block spacing is inadequate, improper mesh can cause grinding, premature wear, or engagement failure—particularly critical in engine rebuild scenarios or custom motor mounts. This shim eliminates those problems by fine-tuning the gap between the starter housing and the engine block, ensuring reliable cold starts and smooth engagement under load.

Manufactured from durable aluminum, this inner shim measures 0.065 inches thick and is designed specifically for Powermaster starter applications. Aluminum construction keeps weight minimal while providing the rigidity needed to maintain consistent spacing through repeated thermal cycles and engine vibration. The natural finish resists corrosion in typical underhood environments. Precision thickness tolerances ensure the shim performs as a true spacer—not a makeshift fix—allowing pinion geometry to stay within manufacturer specifications and maintaining proper armature clearance during starter cranking cycles.

Technicians, engine builders, and restoration shops rely on this shim during initial starter setup or when diagnosing starter noise and mesh problems on Powermaster units. It is essential for custom engine bay layouts where standard mounting may not align the starter properly with the flexplate or ring gear. Installation requires removal of the starter from the engine block; the shim is positioned between the starter housing and mounting surface before final bolt-down. This single-piece design is sold individually, allowing builders to stock multiple shims for various application needs and adjustment scenarios.