How do I get this thing off my crank!?! - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-13-2007, 06:11 PM   #1
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Default How do I get this thing off my crank!?!

So I'm in the middle of this engine teardown and for some reason I can't seem to get this pulley off. We used to call it the harmonic balancer on the old cars, and my book doesn't seem to cover it. The big round pulley that bolts directly to the crankshaft, whatever its called, won't come off. I have the bolt off and I can't seem to figure out why it won't come off. I even tried hammering it off and use my slide hammer, but the thing won't come off!!

Anyone have some experience with this? Is there some trick that I'm missing?
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Old 05-13-2007, 06:41 PM   #2
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Default Re: How do I get this thing off my crank!?!

Quote:
Originally Posted by birchymm
So I'm in the middle of this engine teardown and for some reason I can't seem to get this pulley off. We used to call it the harmonic balancer on the old cars, and my book doesn't seem to cover it. The big round pulley that bolts directly to the crankshaft, whatever its called, won't come off. I have the bolt off and I can't seem to figure out why it won't come off. I even tried hammering it off and use my slide hammer, but the thing won't come off!!

Anyone have some experience with this? Is there some trick that I'm missing?
You need a harmonic balancer puller. There are three fine thread 6mm bolt holes down in the grooves of the balancer in which you install bolts connected to the puller. IIRC you need bolts about 3.5" long. Sears sells a puller for not a whole lot of $.

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Old 05-13-2007, 08:47 PM   #3
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If you rent or buy the puller, you may have to buy the 6mm bolts. Most kits don't come with them.
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Old 05-13-2007, 10:37 PM   #4
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I have a slide hammer puller with the attachment that you show in the picture. Your right it does not come with the bolts, just some other attachments. Does Sears sell the bolts or just the puller? I think that may be where I bought my clide hammer puller. If not I should be able to go to a hardware and get the required bolts? Are there any bolts that I pulled off the engine that would work? I'm guessing this isn't a slide hammer application, but you have to use the center bolt?
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Old 05-13-2007, 10:50 PM   #5
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Quote:
Originally Posted by birchymm
I have a slide hammer puller with the attachment that you show in the picture. Your right it does not come with the bolts, just some other attachments. Does Sears sell the bolts or just the puller? I think that may be where I bought my clide hammer puller. If not I should be able to go to a hardware and get the required bolts? Are there any bolts that I pulled off the engine that would work? I'm guessing this isn't a slide hammer application, but you have to use the center bolt?
The bolts will NOT come with the puller. Buy them at a hardware store. Use the center bolt to pop it loose. The three bolts I use are 6mm diameter x 1.0 mm per thread x 70mm length. You will also need washers for those little bolt heads. I use SAE hardened washers.

BTW, 6mm x 1.0 is very close to 1/4" x 28 threads per inch. Some have reported using those as well. For length, 2-3/4" is equivalent to 70mm. I would get the metric bolts if at all possible.
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Old 05-13-2007, 11:01 PM   #6
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Don't waste your time with a slide hammer, and don't even try the 1/4-28 bolts. That almost cost me a big headache on the first one I pulled.
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