Are you certain that it is your harmonic balancer that is making that noise? I would first assume that it is the timing belt tensioner. Did you replace it along with your timing belt? When the bearings start to go on the tensioner, it will squeal like a scared pig.

Have fun.

Lawren

1983 240T (286k miles, Black)
1995 850T5R (67k miles, Black)
1970 Plymouth Barracuda (340 Cuda, in-violet Purple)

When is squeals it should also get hot as hell from the pulley halves slipping. I had one that apparently loosened the crank bolt from the heating and cooling so the whole thing was hot and loose. But it was the heat that tipped me off first.

Make an early warning system. Use white paint, office "Wite-Out", or similar. Clean a radial band on the harmonic balancer that crosses the ruber ring. Paint a white line in the clean spot, from the edge in about 2 inches.

Check periodically to see that all three parts of the line are in one line.

Good Luck,

Bob

:>)