m R g S r

I just replaced my wobbling crank pulley and squeaking belt on my 06 z51 with 37k miles on it.

I completed the job about a month ago and used brand new OEM parts.

I looked at my crank pulley with the engine running and there is deff. a small amount of run out on the pulley now. Enough to make the tensioner move back and forth while the motor is running. WTF?!

I put MAYBE 1000 miles on it since the new pulley was installed and I know that when I installed the pulley there was almost NO run out at all. If this pulley is bad I am going to be pissedddd!!

niteriderc5

Did you use a new bolt or the original?

m R g S r

New, I used the A&A pinning kit at the time as well. it is NOT installation error, the bolt is not loose, the inner part of the pulley is not wobbling. its the outter part again that is wobbling not the inner part...

06 C6 vert

Did you put the old weights in the exact spot on the new one?.

My second one has gone AWOL 2 weeks ago. The parts are on back order. Did you have any problems finding the OEM?

m R g S r

I ordered the pulley a couple months ago so it came right away no problem finding it.

And I didn't transfer any weights over because in the instructions I was using (manual scan I believe?) it said that transferring weights would create a random imbalance...

Walt White Coupe

Wrong.
.

m R g S r

The old and new crank pulley did not have the same number of holes drilled, and they were not in the same locations. So transferring a weight over from one pulley to the next in a different spot would have created an imbalance.

Walt White Coupe

Then it sounds like the wrong pulley was used.
.

.

m R g S r

I did scribe the location with a knife on the crank and the old balancer and lined up the new one, but I didn't transfer weights over.
Anyway, the weight transferring would only effect the balance of the actual entire rotating assembly, not the pulley itself correct? What I mean is, the flywheel/crank/rods etc are balanced as a whole and the weights are used to balance the assembly, right? NOT for actually balancing the pulley itself....

and it was the correct pulley for an LS2 engine...

m R g S r

Ohh here I knew I saw it somewhere, I wasn't making it up....from the crank pulley replacement TSB....

"Scribe/mark the new balancer in the same location as the old balancer. Do not transfer weight pins on manual transmission equipped vehicles. Most vehicles will be balanced without the use of any additional weight pins."

thats exactly what i did....

Walt White Coupe

That's correct. The pulley is balanced by itself and the weights are added to balance the crankshaft-pulley assembly.

06 C6 vert

So only the automatics get the weights transfered?

m R g S r

So weights or no weights the pulley still shouldn't be running out....I mean it's not a lot at all, but as I said I'm pretty darn sure it was perfect at initial start up when I replaced it and now it is deff running out some...

m R g S r

Anyone else had a crank pulley start wobbling within 1000 miles?

And I wouldn't know because I guess I never had a perfect crank pulley, but is a slight wobble acceptable (ie normal)?

none of the 20 something Honda motors I have had/built/blown up etc ever had a crank pulley wobble...maybe its just a chevy thing? :/

davidtcpa

I would think, yes.

m R g S r

It wasn't a normal wobble. It started wobbling more than the original one, and the belt started chirping/squeaking.

I swapped it out for the ATI harmonic balancer, no issues, and I don't expect there to ever be an issue again!!

06 C6 vert

What? you dont like that old truck OEM pully that they put on the C6?