ATP Parts ZA-517 Clutch Flywheel Ring Gear

Clutch Flywheel Ring Gear Overview

ATP Parts ring gear ZA-517 is a direct-fit replacement for applications that use a 120-tooth flywheel ring gear with a 12.051-inch outside diameter. It restores starter engagement when worn or broken teeth prevent the engine from cranking properly.

Key Features

• 120-tooth ring gear for starter motor engagement
• 12.051-inch outside diameter with 10.78-inch inside diameter
• 0.475-inch thickness for the specified flywheel setup
• Front chamfer orientation for proper starter mesh
• OE-style fit and function for the original application

Detailed Description

This clutch flywheel ring gear is built for Nissan applications that match the listed tooth count and dimensions, including Nissan 280Z, 280ZX, 200SX, 510, 620, 720, 810, Maxima, and Van models in the fitment table. The ATP Parts ZA-517 ring gear is engineered to match the original part’s fit and function, helping maintain reliable starter engagement and consistent cranking performance. If the existing ring gear teeth are worn, chipped, or broken, replacement is the correct repair. This part cross-references Pioneer Automotive Industries FRG-634 and AMS Automotive 4470 for the same application.

What It Is Used For

• Repairing worn starter engagement teeth
• Restoring engine cranking when the ring gear is damaged
• Replacing a ring gear that no longer meshes correctly with the starter
• Addressing tooth wear from repeated starting cycles

Installation Notes and Tips

Verify tooth count, outside diameter, inside diameter, thickness, and chamfer orientation before installation. This part is listed for Nissan applications with 120 teeth and a 12.051-inch outside diameter, so matching the flywheel specification is essential. Confirm the vehicle application in the fitment table and compare the removed ring gear to the new part before assembly.

Quality Assurance

ATP Parts designs this ring gear to fit and function like the original component, supporting proper starter engagement and long service life in the specified application.