Bentolin Harmonic Balancer Installation Tool for Chevy 350 SBC & BBC — Heat‑Treated Rod, Thrust Bearing

Bentolin's 66515 harmonic balancer installation tool is a heavy‑duty installer kit designed to safely and accurately press harmonic balancers onto Chevy 350 SBC and BBC crankshafts.

When replacing or reinstalling a harmonic balancer on a small‑block Chevy (SBC) or big‑block Chevy (BBC) 350 crank, having the correct installer prevents damage to the crank snout and ensures the balancer seats squarely. This kit replaces the common 66515 tool and includes a threaded rod, nut, washers and a thrust bearing to provide a controlled, aligned press without relying on hammering or improvised methods. Made from heat‑treated steel with galvanized hardware and an aluminum washer, the tool resists corrosion and is built for repeated shop use.

How does this tool protect the crankshaft during installation?

The Bentolin installer applies steady, centered force through the crankshaft threads so the balancer slides on evenly. Using the included thrust bearing reduces friction and heat while the nut is turned, preventing galling on the crank snout.

• Threaded rod aligns through crank and balancer for straight pressure
• Thrust bearing minimizes wear and reduces turning torque
• Galvanized nut and aluminum washer resist corrosion during use
• Heat‑treated steel rod provides rigidity to avoid bending

Which engines and crank sizes is this kit compatible with?

This installer is built to fit Chevy 350 small‑block and compatible big‑block applications that accept the same crank thread pattern. It’s intended for standard 350 SBC/BBC crank snouts and common harmonic balancer diameters used on these engines.

• Designed for Chevy 350 SBC and BBC crankshaft threads
• Works with most OEM and aftermarket harmonic balancers for these engines
• Not intended for non‑Chevy cranks or unusual thread pitches without verification
• Check crank thread size to confirm fit before use

What parts are included and what materials are used?

The kit ships as a compact set that includes every component needed to perform the installation. Components are specified for shop durability and corrosion resistance to extend service life.

• 1x threaded rod — heat‑treated heavy duty steel for strength
• 1x nut — galvanized steel to resist rust and bind
• 1x aluminum washer — low friction and corrosion resistant
• 1x thrust bearing — reduces friction for smooth installation

How do I use the Bentolin 66515 installer safely and correctly?

Installation is straightforward: thread the appropriate end into the crankshaft, place the balancer, add the washer and bearing, then rotate the nut to draw the balancer on. Use steady turns and confirm the balancer remains square as it advances.

• Thread the rod into the crank until firmly seated
• Slide balancer onto rod, then add thrust bearing and washer
• Turn the nut slowly, keeping the balancer aligned and centered
• Stop at correct seating depth; verify keyway and timing marks as needed

Who this is for: This Bentolin 66515 harmonic balancer installation tool is ideal for professional mechanics, performance engine builders and home restorers who work on Chevy 350 small‑block and compatible big‑block engines. If you perform balancer installs or engine rebuilds and need a reliable, reusable installer that prevents damage and speeds the job, this kit offers a rugged, shop‑ready solution without relying on improvised pullers or hammers.