Harmonic Balancer Hardware

Do you only need to replace the hub or the outer shell on your harmonic balancer? In this category you'll find hubs with inner shell and complete shell kits from ATI, for when you want to change diameter, belt grooves or material without replacing the entire damper.

What the hub and shell do in an ATI damper

A harmonic balancer from ATI is built from several parts, so you can typically replace the hub or the shell separately. The hub with inner shell mounts on the crankshaft, while the outer shell carries the belt grooves for the accessory drive. This can be relevant if your project requires a different belt drive, a different diameter or a different material. Complete units can be found under complete harmonic balancers, and other solutions under crank dampers.

How to choose the right part

• Engine: The hub is engine-specific, e.g. for BMW B58/Toyota Supra, Nissan RB26, Dodge 392 6.1 Hemi or Chevy small block and big block.
• Diameter: Sizes such as 5.5 or 7.48 inches affect how fast the accessories are driven and how much space is required in front of the engine.
• Belt grooves and mounting: Check the number of grooves and the bolt pattern, e.g. 6 grooves or Ford with four bolts in front.
• Material: Steel and aluminium typically differ in weight and strength, and the choice depends on the application.
• Special variants: E.g. versions for dry sump or with an undersize bore, which must match your specific crankshaft.

Installation typically requires suitable tools and the correct tightening torque according to the manufacturer's instructions. More damper types and accessories are collected under harmonic balancers.

Frequently asked questions

Can I replace only the shell on my ATI damper?

The parts in this category are hubs and shells that can be replaced separately. Check that the diameter, number of belt grooves and bolt pattern match your existing hub and your engine before you choose.

What does undersize on a hub mean, e.g. .005?

It indicates a bore that deviates from the standard size. Which variant you need depends on the specific crankshaft, so measure the crank snout or check the manufacturer's data for the part number before you order.

Does the hub require a special installation method?

Harmonic balancer hubs are typically press-fitted onto the crankshaft and require suitable tools as well as the correct tightening torque. Follow the manufacturer's instructions for the specific part number, and check the key and centring after installation.