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Old 07-19-2008, 04:10 AM   #1
branch99
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Default harmonic balancer

1998 sl2. Harmonic balancer keeps blowing apart. on my 3rd one. whats wrong? its got 160,000 miles on it. could the bearings on the cam shaft be so worn that the shaft moves back and forth allowing the balancer to strike the engine block?

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Old 07-19-2008, 04:43 AM   #2
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Default Re: harmonic balancer

If your putting the harmonic balancer on the cam shaft and not the crank shaft then that is most likely the problem, though I dunno how it could be done.

Aren't they supposed to be machine matched to the crank, to work properly?

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Old 07-19-2008, 05:43 AM   #3
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Default Re: harmonic balancer

You need to figure out your terminology.

The crank shaft has the harmonic balancer on it. It is what the serpentine belt gets driven by. IE it is external to the engine. The cam shafts have sprockets (internal to the engine--IE behind the timing chain cover) on them that the timing chain runs on to drive the cams. There is also a sprocket on the crank shaft (internal again) that is the drive for the timing chain.

So what is blowing apart on you? Better yet, pictures.

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Old 07-21-2008, 05:56 AM   #4
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Default Re: harmonic balancer

Quote:
Originally Posted by ssicarman View Post
So what is blowing apart on you? Better yet, pictures.
Yeah, I want to see pics too. I suppose on a DOHC, it's possible for the crankshaft pulley (It's not really a balancer) to come apart. Those do have some rubber between where the belt rides and the center. However, you would be the first to have it happen.

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Old 07-21-2008, 07:38 PM   #5
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Default Re: harmonic balancer

The crank pulley on the DOHC engines is actually a harmonic balancer. The SOHC ones are not. The harmonic balance is one because there is an outer vibration absorbing metal ring bonded via rubber to the inner part of the balancer.

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