posted on Apr, 23 2009 @ 11:04 PM
The broken pieces on the outside of the harmonic balancer look like it was possibly hit with a hammer to drive the pulley on or a puller was used
improperly to cause those cracks. If the cracks formed and pieces lost, it would have thrown the harmonic balancer out of balance and could have
caused the crankshaft bolt to snap off. It would have undergone severe vibration if the outer piece(s) came off. That would have then resulted in the
keyway being wallowed out. As hypervigilant asked already, how does the end of the crankshaft look. The keyway slot especially on the crankshaft. If
it is wallowed out, you will have one or two choices on repairing it. Either replacing the crankshaft or using an industrial remetalizer to repair the
keyway. I used to work for a company that sold these type of epoxy rematelizers for use in heavy and maritime industry that was used for many things,
one being repairing keyways. Belzona or other industrial remetallizers.
Here is the Belzona website where you can see repairing keyways is one application:
I would need a photo of the crankshaft with keyway visible to see if it needs to be repaired or replaced. I used to do ship propeller shaft in
destroyers, tankers, etc and almost every type of keyway application there is in heavy industry. It is critical to do proper preparation before
applying these type of compounds. The remetalizers are machinable when dried, as long as you have done the surface prep and repair as instructed.
If the crank shaft and its keyway are not damaged, you can get another harmonic balancer from a salvage yard, and the bolt, and install a new key and
torque the crankshaft bolt to the proper torque specifications. I would also use a little Loctite Threadlocker Red 271 on the crank bolt to make sure
it doesn't vibrate loose.
[edit on 23/4/09 by spirit_horse]