Harmonic Balancer Bolt Threads Oops - S-10 Forum
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post #1 of 4 Old 08-26-2015, 08:02 PM Thread Starter
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Harmonic Balancer Bolt Threads Oops

I stripped my threads on 85 Blazer 60v6 crank where pulley bolt goes in. Threads in crank ruined. oops. I was using bolt to run harmonic balancer up had my air impact the bolt is M12x1.5 metric fine thread. Would have been okay one time but I pulled HB three or four times long story. Got a new bolt. Anyway do you guys have any experience repairing these crank threads with HeliCoil? Is it scary? Thanks. Love my 60v6.
Chase in Alabama

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post #2 of 4 Old 08-28-2015, 02:37 PM
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Re: Harmonic Balancer Bolt Threads Oops

Would it not be easier to retap it a larger size and use a larger bolt?

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post #3 of 4 Old 08-31-2015, 10:33 AM
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Re: Harmonic Balancer Bolt Threads Oops

Ooofff... Bad news Dood.
Two options... a longer bolt by 1/2" or ^^ what JK said.
Only problem here... the bolt is a specialty fastener. You will have to go to a fastener supply like Fastenall or similar to find what you need.

How bad did you rip the threads out? Completely?
I have never seen a Heli-Coil that size, but that doesn't mean they don't make one.

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post #4 of 4 Old 09-01-2015, 01:53 PM
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Re: Harmonic Balancer Bolt Threads Oops

If it were me, I would try to clean up the threads and see if you could get the balancer on one last time. I would then Loctite he bolt in place after I seated eh HB. If that didn't work, then I would sit back and drink a cold one or two and think hard on what to do next.

Definitely get a longer bolt to at least start the balancer with. I think an extra 10mm longer would be plenty good. I would also bet it is only the first 5mm(ish) that is wrecked. So the longer bolt would get you into good threads and then allow it to seat. Obviously, you would need to put the original bolt back in to completely seat the HB.

Good luck

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