Skylarking
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Hahaha... hardly a magician
opinionated, nah but that probably depends on who you ask It's simply that I've been around for many years and had a lot of car problems over those years and have had to deal with sellers always try and avoid their responsability. As such, i try and pass on the little i've learned so it's not so easy for others to get screwed by sellers who don't want to stand by the products they sell.
As for your spinning HB, it looks ok to me but looks can be decieving. It also doesn't sound like the engine is missing or running badly but that could just be the video as you say...
GM has some service bulleting as to how much runnout the HB can have before its considered faulty. I couldn't find a link to the Chevy SS LS3 TSB but at least I've got a link for the PPV and G8 (6ltr V8?), see here, I've repeted the TSB below:
#PIP4750E: Belt Squeak Noise And/Or Crankshaft Balancer Appears To Wobble - (Feb 10, 2012)
This PI was superseded to update recommended field. Please discard PIP4750D.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern: Some customers may complain of a belt squeak noise and/or a crankshaft balancer appears to be out of
balance or wobbling while watching it with the engine running. In most cases, the wobble is an optical
illusion because the design of the balancer gives the appearance that it is moving more than it actually is.
Recommendation/Instructions: If this concern is experienced, follow the steps below:
Notice - An inaccurate reading may be obtained by measuring the face of the balancer instead of the rear of
the drive belt groove. Please follow this diagnostic or repair process thoroughly and complete each step. If the condition
exhibited is resolved without completing every step, the remaining steps do not need to be performed.
Subject: Belt Squeak Noise and/or Crankshaft Balancer Appears to Wobble
Models: 2010-2012 Chevrolet Camaro SS
2011-2012 Chevrolet Caprice
2009-2012 Chevrolet Corvette
2008-2009 Pontiac G8
with 6.0L 6.2L Engine (RPOs L76 L77 L99, LS3, or LS7)
1. Push the crankshaft all the way to the rear of the engine.
2. Using a magnetic base, attach a dial indicator so the measuring tip is contacting the rear of the
drive belt groove.
3. Rotate the crankshaft 360 degrees and note the total amount of crankshaft balancer run out.
• If the balancer run out is 0.40mm (0.0157”) or less, do not replace the balancer because the run
out is in specification.
• If the balancer run out is greater than 0.40mm, replace the crankshaft balancer and perform step
3 again to confirm that the run out of the new balancer is in specification.
4. If the customer has complained of a belt squeak, also replace the drive belt.
So get a dial guage and check runnout is less than 0.4mm, else you should replace it (can't see that 6ltr and 6.2 ltr would be vastely different).
A 0.4mm runnout is hard to se so the following block has serious issues...
and not sure what engine the below video is related to by if you watch it to teh end, you'll find out why sometimes things can be more urgent than a squeek can indicate
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