Crankshaft Pulley? What's Going On Here?


Asked by Dec 19, 2015 at 04:14 PM about the 2002 Pontiac Grand Prix SE

Question type: Maintenance & Repair

Started the car this morning and the drive belt was off. Popped the hood
and was greeted with this monstrosity. Those metal teeth..... I think this is
the crankshaft pulley.....Is this what happens when the crankshaft pulley
starts to separate?

How much is this one going to run me?


8 Answers

Bob Beaman

Yours has separated and needs to be replaced. It is called the harmonic balancer, vibration damper or crankshaft pulley.


They should be plentiful at the auto wreckers although I'd check with an auto parts store (not a dealer) about the price of a new one. You may be pleasantly surprised. If not though a used one is probably fine for an older car like yours. You'll likely need to replace the serpentine belt as well with a new one. I don't know for sure, but I would expect about 3 hours labor at a shop. They should be able to give you an estimate over the phone.

Bob Beaman

I would recommend buying a new part for this repair. I would use a new genuine GM part instead of aftermarket. A used salvage part may cause the same issue. Just my opinion.....


If it was a newer car I would agree, but given its age the replacement part probably doesn't need to last long and the car is certainly not worth spending any more money than necessary on.

Bob Beaman

That part won't be fun to get to. I would recommend new so the repair only has to be done once. We will have to agree to disagree on this one.


Actually I don't disagree with you. Your advice is good. Just throwing out other options since sometimes every penny counts or the car is just being repaired to sell. I think the part is fairly easily accessed via the front right wheel well opening. Had one done on a Bonneville a few years back and I think it was the part, not the labor that was crazy expensive. Of course in my case it was the supercharged version and the only place I could find the part was at the dealer.

Bob Beaman

You could be correct and it maybe an easier job than I thought. Years ago if it was front wheel drive and needed a harmonic balancer it was an ugly job.


Those teeth are the reluctor wheel for the crankshaft sensor. It's part of the harmonic balancer. I agree with Bob on this one. New is better here. I'd also replace the crankshaft sensor while you're right there. They're troublesome to begin with. HTH. -Jim

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