TSB for wobbling harmonic balancer on vettes?
Thread Starter
Teching In
Joined: Oct 2007
Posts: 33
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From: Wilmington, DE
TSB for wobbling harmonic balancer on vettes? I was wondering if there was a TSB (Technical Service Bulletin) about the harmonic balancer wobbling on the c5 ls1 vettes? If so could somebody provide me information or a link?
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
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From: BFE
Repace crank/pulley bolt and retorq to proper value. Some bolts have been known to back out. I would take care of this ASAP, because you do not want to see what a loose pulley can do to your car if it comes off at 6000 rpm 
How many miles on the car? They seem to go about 60K in normal use and then have issues (rough number). If its wobbling and it comes off (not to mention its likely not doing its primary job right now of damping the crankshaft harmonics) serious damage can result.
The C6's might have a TSP because they had problems right from the start. A number of them backed off, damaged the steering rack which then slung PS oil everywhere and a number of people had their paint damaged as a result so the car had to be re-painted. That might be the TSP you are referring to.
The C6's might have a TSP because they had problems right from the start. A number of them backed off, damaged the steering rack which then slung PS oil everywhere and a number of people had their paint damaged as a result so the car had to be re-painted. That might be the TSP you are referring to.
