lr4 colorado v8

So I pulled my bent ballancer today, and checked the crank snout runout it was .001" measured with a dial indicator off the nose (snout) of the crank, with the plugs out and the engine cranking over. Cannot find the spec for this I have a factory service manual, and all it lists is rear flexpalte mounting surface runout .002" max, main journal runout .001" max.. no spec for crank snout? WTF I would asume .001" is fine?

Next question new ballancer from the stealership 220.00!!! Aftermarket Dorman 62.99 do I trust Dorman?? ARP or factory ballancer bolt, either way it should be replaced, as it is torque to yield? factory bolt 10.00 Arp costs?

Do I need an installer tool? GM # J 41665 and J 41478 is there a aftermarket installer? I could use grade 8 ready rod whatever sixe it is 15mm? and a peice of steel tube a wahser, and a nut??

I broke a peice of metal out of the thread on the crank, while using a 1/4" drive socket,to have the puller press against, it got wedged in there and broke the first thread, I fished it out, and got the bolt started back in by hand, still lots of thread left, thinking it may be ok??

At this piont I am thinking of installing a new ballencer, and running the motor, hoping there is no hidden dammage or cracks from the acident. It costs far to much to pull the motor apart and have it crack checked hot tanked, new cam bearings and seals installed!

I am hoping that since the crank seems to be ok, that there wouldn't have been to much stress on the mains?
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2007 gmc 4.8l motor in a 04 colorado.



I think just the bolt, abd ballencer are bent? vid..
[youtube]TLjFemK0AqU[/youtube]

Mangled03gmc

iTrader: (95)

That is more then in spec.. Hell I think mine was out alot more then that.. i would have no issue running that..

AKlowriderZ71

iTrader: (22)

Sounds like the crank is in spec.

You'll be okay with the Dorman balancer. Get a new ARP bolt, or a new GM bolt, but the ARP can be re-used. (many have re-used the stock bolts successfully, including myself).

Use this tool for installing it. https://www.performancetrucks.net/fo...l-tool-476965/

I watched your video. What was knocking? Sounds like you may have more problems with that engine than the balancer & bolt....

dirt track racer 81

iTrader: (45)

In all honesty if that was my motor, I'd pull it a part and replace the main beaings. Cause you know that crank to be hit that hard it didn't do the thrust bearing any good and could have possibly have damaged it. Jmo