Crank pulley bolt

[GasGuzzler]

I can almost garuntee it's not on all the way.

My 1/2" impact is rated at 600ft/lbs in reverse and can break off 5/8" (16mm) dually wheel studs but will not seat one of these because of the nature of the design (hammering action instead of steady push).

"Hitting it with a breaker bar" is using force on the bolt and bolt head against the crank to try to pull it on. That is much different than having a stud threaded all the way into the crankshaft and a nut (applying force to the stud threads) forcing only the pulley on.

Then again, whatever works.

No disrespect Greg, you have some sweet-ass homemade tools that are proven to work better than the over-priced and delicate K-M tools issued to GM dealers! Many of you have good cheater methods too....

[George C]

impact gun is only as good as the air source.......so blow little harder and ti will go on

[6.0vortecchevy]

My impact is rated for 1000lbs, lol were talking about the same thing on diff threads.

[GasGuzzler]

The gun ratings are not the same as steady twisting force ratings due to the hammering nature (they're higher).

[6.0vortecchevy]

so what is mine really.

[DamnYankee]

I've done a bunch of cam swaps and always ALWAYS used an impact. Then my last one came loose.

DO IT PER GM SPECS. THERE ARE SPECS FOR A REASON.

[1BADC10]

Never had a problem with the ones I've R&R'd. Heated the pulley with a propane torch just enough to seat it on the crank, then used the old bolt to seat it completely. I've replaced the bolt on one cam swap, but not the second time. I'm reusing the bolt on my low-mile, refreshed motor, but yes, GM "recommends" replacement. Sorry, I don't do "everything" GM recommends. LOL

GM "thinks" LS based motors should last 200K before major maintenance. I had an ALL STOCK Yukon 5.3L that said otherwise.

[GasGuzzler]

I know several people with more than 200K on theirs.

The reason it's supposed to be replaced is that the torque spec stretches the bolt to a point just before failure. The the bolt is loosened, it will not have the same properties when tightened the second time. Same principle for the head bolts.

[6.0vortecchevy]

Wait head bolt are torque to yield also.

[GasGuzzler]

Yep.