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Harmonic balancer bolt came off while driving

So while i was driving one day i heard a loud metal clunk noise like something metal came off and hit the asphalt from under my car. my car still kept driving fine so i figured it was something i ran over. luckly i was right down the street from my house because my car started making a weird noise and felt like it was hesitating to run so i looked under the hood and my belt appeared to be loose after taking a look i noticed it wasnt my belt that brooke but my harmonic balancer was loose and not connected to anything but was still holding the belt in place which is why i was able to get home. i dont know too much about cams and pulleys and all that stuff but i push the balancer on to i think the cam or whatever it is that it connects to and the car will start but it doesnt spin the belt well because no bolts or anything so i think i can use the same balancer? soo after all that my question is , do i need to buy a new balancer and what exactly do i need to reinstall it.. ive heard stuff about something called a woodruff key? thank you

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Not all of them have a woodruff key, but yours may still be on the crankshaft if you had one. At one time, someone had that pulley off and did not tighten the bolt tight enough-they need to be very tight according to specs, over 100 ft. lbs. of torque when tightening.
Check the balancer for damage and the crankshaft where it sits on. If no visible damage, I think you could use it. Did you go back and pick up the bolt and washer? You need them, or a duplicate from a salvage yard. Now fit the balancer pulley on the crankshaft (its the crankshaft, not the camshaft). It only goes one way. If yours slides on any which way, you have lost the woodruff key, and will have to get one-it would fit in a slot on the shaft, and the notch in the pulley rides over the woodruff. if yours is like that, fit the pulley on, tighten the bolt down solid. You may have to wedge something against the pulley while tightening the bolt to keep the crankshaft from turning. Once you get it on, then fit your belt back on, and you're good to go.

Posted on Nov 27, 2012


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SOURCE: V groove pulley slipped off of harmonic balancer of 1999 Grand Am

After checking around, I decided to replace the harmonic balancer. I had a repair shop fix it for me and I think they over charged for the part. But, at least I'm on the road again. This Grand Am has 227,000 miles and still runs pretty good. 

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Make sure you check timing and the belt. if it spun don't risk putting it back on. Hope you got a new key. TIMING is important so you don't stick a valve through the top of your piston

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A basic set of tools and a little patients is all you need. You will need to remove the a/c compressor from the bracket. Once the compressor is out of the way you will see the hidden bolts that hold the bracket in place. There are several that hold bothe the composer to the bracket and the bracket to the block. I can't imagine the problem is with anything you think it is. I think the compressor is jacked possibly from lower the back side of the motor to far when the trans was service? "if you still can't help you are dumber than me" with comments like that it doesn't take much to be smarter than you! Post a pic if you can. The more the better. Host them on google documents and post a link to them.

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