Signs of bad harmonic balancer?

mooktank

New Member
Jul 7, 2004
237
0
0
What are the signs of a bad harmonic balancer? When I look at mine it doesn't look like it's going in a perfect circle. It also makes a knocking noise at idle that goes away if i rev it. I can feel the knock if I put my hand on the engine. I was thinking this is the harmonic balancer. ANyone agree?
 
not sure on that last question. EFI 5.0's use a 50 oz imbalance and i think 351's use a 28 oz (DON'T take my word for it!).

if you look at the balancer, the elastomer might be coming out of it - that is a tell tale (to get a new one). wobbling is also a tell tale.

good luck.