Question about Buick Century

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How in the world do I break the bolt to the harmonic balancer loose on a Buick Century, 3.3 liter V6. No way to wedge the engine solid enough that I can find.

I've already tried putting the breaker bar with a cheater pipe on it and bumping the starter. Nuttin. How in the world do I keep the engine from turning while I put a long cheater pipe on it to bust it loose? Even an impact wrench does nothing.

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  • Doug Adams
    Doug Adams Mar 31, 2015

    A lot of the electric impacts have more power than the air ones. If the motor is turning some when the impact is trying to work, you are losing all the hammering action. Maybe put the belts on and have someone try to hold it while using the impact. The heat idea expressed earlier may work too, by heating the bolt it should in theory get longer. That way the only thing left holding is the threads. I had a lot of harmonic bolts out and only had one as stubborn as what you say this is. I had to heat it to get it out.

  • toot tall
    toot tall Mar 31, 2015

    got to get my tank filled, but yeah, heat is on the agenda today. Gonna try that bit with a wrench in the slot too.

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  • Buick Master
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Soak it with pb blaster for a day,wipe off excess and use a torch to heat the bolt,then try it

Posted on Mar 30, 2015

  • 1 more comment 
  • toot tall
    toot tall Mar 31, 2015

    That's the next thing we'll try. That's the plan anyway.

  •  johnny rebel
    johnny rebel Mar 31, 2015

    also try wedging a 1 inch open end wrench inside one of the slots and tie it in place so it wont move,or put cheater bar on that too against the ground,try to hit the head of the nut with a hammer.

  •  johnny rebel
    johnny rebel Mar 31, 2015

    good luck

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  • Master
  • 682 Answers

The way I always do it if all else fails, is take off the flywheel dust cover and hold the flywheel with a bar against bell housing to flywheel teeth. The other way is to use an impact wrench, if you can get it in there. The hammering action of the impact nearly always breaks it loose.

Posted on Mar 30, 2015

Testimonial: "Impact is electric, and doesn't have the power to break it loose. If I can't find another way, I'll do the flywheel thing, but it's so difficult to get to the flywheel cover, I was trying not to have to do that May have no choice. Always worried about breaking teeth on the flywheel. Tried the hammer bit today, didn't help. Access to the bolt isn't bad, you go through the wheel well. Thanks to whoever for the wrench in the holes idea. Try that next. wedges don't do it."

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Posted on Jan 02, 2017

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