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Originally Posted by iceman2
I just noticed the pulley over my crankshaft has pushed out about 1/2 inch from where it should be, this has caused the serpentine belt to fly off as it is not lined up with the alt, BT, PS, and AC. The book says an harmonic balancer is required to install this thing. WTH is that? Does anyone know a quick way to push the wheel back into place. I tried tightening the 15 mm bolt, but the whole thing turns.
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Hey Iceman, Your just a wealth of good news ..... Thought it was a funny coincidence that you serp belt broke right after you did your IMG. The harmonic balance (also called a torsion vibration damper or vibe damper for short) is part of the crankshaft pulley assembly on this engine, basically the outer ring of the pulley is isolated from the inner ring of the assembly by a highly compressed piece of rubber. As individual cylinders fire the crankshaft winds up (yeah I know how could something that hard made out of steel wind up, trust me it does even on these wimpy 3.4L engines) .... the rubber absorbs this energy and gives it back to the crankshaft slowly (well relative the speed of the crankshaft it's slow) it kind of act like a shock absorber for your crankshaft. Without the vibe damper the crankshaft would snap.
Now that you know what a harmonic balancer is ... if the pulley was in the right place before you started with your IMG adventure I kind of think it is still in the right place after you replaced you IMG, however.... did you put the 3/8 steel lifting hook plate back between the accessory drive mounting bracket and the cylinder head? That would account for the about 1/2" your looking at. I did the same thing but the long bolt for the accessory bracket wasn't seated before it was tight. That was when I noticed the lifting hook sitting on the work bench.
Hope that is what it is, even though it will be a pain in the ass to put it back in if it is.
Let me know.
Sparky