Are harmonic balancers on these engines a problem?

Tech discussions on the L77 6.0L V8.
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coppcarz
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Are harmonic balancers on these engines a problem?

Post by coppcarz »

So my '12 V8 PPV has a balancer problem.....it shakes a bit, and it's noisy. (86,000 miles)

A mechanic friend of mine, who owns a late 2000 vette, told me he had to replace his GM one twice and went with fluidampr the second time.

Are the GM ones known to be problematic?
s/c'd cav
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Re: Are harmonic balancers on these engines a problem?

Post by s/c'd cav »

alot of people think they are a problem , more so than not its just your eyes playing tricks on you , while some do have a problem
coppcarz
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Re: Are harmonic balancers on these engines a problem?

Post by coppcarz »

Mine is chirpping very loudly, while it can be other parts of the belt system, maybe the tensioner or pulleys, I'm pretty sure it's the balancer.

Does the radiator hve to come out for the balancer to be replaced?
s/c'd cav
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Re: Are harmonic balancers on these engines a problem?

Post by s/c'd cav »

the balancer is a fixed part , not likely to make any noise , unless the outter ring is slipping

its easier to get out with the rad being out , because the puller needed
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elc32955
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Re: Are harmonic balancers on these engines a problem?

Post by elc32955 »

Check GM service bulletin PIP-4750-D/E for the 2011 & 2012 Caprices. This is a problem that dates back to the initial release of the Caprice. Mine on my 2011 was done under warranty. Also germane to the G8, the Corvette, and the Camaro - both 6.0l and 6.2l engines. Here's the linky;

https://static.nhtsa.gov/odi/tsbs/2012/ ... 9-8211.pdf

Also a quick search pulled up this old thread....

http://www.newcaprice.com/forum/viewtop ... =14&t=1247

Eric
System Manager and your tour guide for the day. 2015 Caprice w/LFX, former NC DPS staff car. Partial hybrid G8/SS/Camaro SS interior mods, SS MyLink radio upgrade, 2016 Camaro V6 rims, GMPP Malibu chrome exhaust tips, otherwise bone stock for now.
Sanford
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Re: Are harmonic balancers on these engines a problem?

Post by Sanford »

The bulletin has an extra zero in the wobble tolerance dimension. The 4mm equivalent should be 0.157” not 0.0157” as printed.
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elc32955
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Re: Are harmonic balancers on these engines a problem?

Post by elc32955 »

And, here is the updated current bulletin - now it's up to the "G" revision. Covers 2011-2017 Caprice. Updated in June, 2020. I've posted a copy of the "F" bulletin on the site's files section that covers 2011-2015 cars, I'll have to go back and amend it with the G version. Public record direct from the NHTSA. Linky;

https://static.nhtsa.gov/odi/tsbs/2020/ ... 3-9999.pdf

Well now... whoever revised this TSB was sort of dense - it refers to the "6.2 L77" engines we have. And the 6.2 L76's in the G8's. Where did GM hide those extra horsies from us all these years??? And, the typo is still in the bulletin Sanford. Incredible no one caught it.

Eric
System Manager and your tour guide for the day. 2015 Caprice w/LFX, former NC DPS staff car. Partial hybrid G8/SS/Camaro SS interior mods, SS MyLink radio upgrade, 2016 Camaro V6 rims, GMPP Malibu chrome exhaust tips, otherwise bone stock for now.
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