Driving a harmonic balancer on with a hammer is how crank snouts get damaged and balancers go on crooked. This tool threads a pilot stud into the crank and pulls the balancer on square to the crankshaft centerline, so it seats evenly without binding. The thrust bearing lets the drive nut spin freely, which means the effort goes into moving the balancer instead of fighting friction.

Moroso 61741 Harmonic Balancer Installation Tool Features:

• Works on big block Chevy and any engine with a 1/2 in.-20 threaded hole in the crank.
• Pilot stud keeps the balancer perpendicular to the crankshaft centerline for a bind-free installation.
• Thrust bearing allows the drive nut to rotate freely for smooth, even pressing.
• Protective washer included.
• Sold individually.