Replacement Pinion Gear 11 Tooth

The POWERMASTER Replacement Pinion Gear 11 Tooth (Part Number 604) is an authentic OEM-specification component designed specifically for Denso-style 11-tooth starter motors. This single pinion gear serves as a direct replacement for worn or damaged stock gears in starter assemblies, ensuring 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, maintaining the proper gear ratio and rotational force delivery. At a verified weight of 3.2 oz 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 ensures critical mesh geometry with the ring gear, preventing slippage and ensuring consistent cranking torque application.

Mechanics and technicians choose this replacement gear for starter rebuilds and worn-unit repairs, particularly on vehicles equipped with Denso-platform starters. 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. 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.