Sierra Ring Gear-Flywheel 18-4516, 14 Inch GM Flywheel, 168 Teeth

The Sierra Ring Gear-Flywheel 18-4516 is a replacement ring gear sized for a 14 inch GM flywheel with 168 teeth. It is used in marine engine applications where the flywheel ring gear has worn, cracked, or lost teeth from repeated starter engagement, a common failure point that can cause starter grinding or intermittent no-crank conditions. Installing a correctly sized and correctly toothed ring gear is important because a mismatch in diameter or tooth count will cause the starter pinion to bind, skip, or fail to engage the flywheel at all.

This ring gear is manufactured to fit the 14 inch GM flywheel platform specifically, with 168 teeth, so it is intended for engines using that flywheel size and tooth count rather than the 12 inch, 153-tooth GM flywheel platform, which uses a different ring gear. Confirm your existing flywheel's diameter and tooth count before ordering, since installing the wrong ring gear on the wrong flywheel size will result in improper starter engagement.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-4516
• Product Name: Ring Gear-Flywheel
• Flywheel Diameter: 14 inches
• Tooth Count: 168 teeth
• Fitment: 14 inch GM flywheel
• Weight: 2.9 pounds
• UPC: 808282294892

Fitment

• 14 inch GM flywheel with 168 teeth

Frequently Asked Questions

What size flywheel does the Sierra 18-4516 ring gear fit? The Sierra 18-4516 is sized for a 14 inch GM flywheel with 168 teeth. It is not intended for the smaller 12 inch, 153-tooth GM flywheel, which uses a different ring gear part number.

How many teeth does this ring gear have? 168 teeth. Matching the tooth count to your flywheel is essential for proper starter pinion engagement.

How much does the 18-4516 ring gear weigh? It weighs 2.9 pounds.

Is this the same as the 12 inch GM ring gear? No. The 18-4516 fits a 14 inch GM flywheel with 168 teeth, while the 12 inch, 153-tooth GM flywheel uses a separate Sierra part number.

What is included when I order the 18-4516? You receive one Sierra Ring Gear-Flywheel, part number 18-4516, sized for a 14 inch GM flywheel with 168 teeth.

Why would I need to replace a flywheel ring gear? A worn, cracked, or chipped ring gear can cause the starter to grind, slip, or fail to turn the engine over. Replacing the ring gear with the correctly toothed 18-4516 restores proper starter engagement on a 14 inch GM flywheel.

Does the 18-4516 come with the flywheel itself? No, the 18-4516 is the ring gear only, sized for a 14 inch GM flywheel with 168 teeth; it is not sold with a complete flywheel assembly.

Can I use this ring gear on a non-GM flywheel? The 18-4516 is designed for a 14 inch GM flywheel with 168 teeth, so fitment outside that specification is not confirmed.

Is the UPC listed for this part number available? Yes, the Sierra 18-4516 Ring Gear-Flywheel carries UPC 808282294892.

What is the difference between 18-4516 and 18-4517? The 18-4516 fits a 14 inch GM flywheel with 168 teeth, while 18-4517 is a separate part sized for a 12 inch GM flywheel with 153 teeth. Confirm your flywheel's diameter and tooth count before choosing between the two.