Replacement Pinion Gear 11 Tooth

The POWERMASTER Replacement Pinion Gear 11 Tooth (Part Number 604) is an authentic OEM-specification starter component engineered for Denso-style 11-tooth starter motors. This single pinion gear serves as the direct replacement for worn or damaged stock gears in starter assemblies, restoring reliable engagement between the starter motor and engine flywheel during ignition.

The 11-tooth configuration matches OEM specifications for compatibility with factory Denso starter designs, ensuring proper gear ratio and rotational force delivery. At 0.2 lbs and measuring 3.3 x 1.5 x 3.75 inches, this compact component fits directly into existing starter housings without modification. The precision-machined tooth profile maintains critical mesh geometry with the ring gear, preventing slippage and ensuring consistent cranking torque application across cold starts and extended engine demand.

Mechanics and technicians choose this replacement gear for starter rebuilds, worn-unit repairs, and preventive maintenance on vehicles equipped with Denso-platform starters. Field experience shows that pinion gear wear typically manifests as delayed starter engagement, grinding noise on initial cranking, or reduced cranking speed under cold conditions. Replacing the damaged gear alone—rather than the entire starter assembly—offers significant cost savings while restoring original performance when the starter body and solenoid remain functional.

This part is commonly included in starter repair kits alongside the return spring, contact cap, and retaining clip. OEM cross-reference and genuine POWERMASTER manufacturing ensure dimensional accuracy and material hardness consistent with Denso original specifications, reducing the risk of premature tooth wear or failure after installation.