https://www.AsktheBuilder.com founder, Tim Carter, demonstrates a handy method to ensure concrete pier anchor bolts are in the correct location when you pour concrete.
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This is the informational video, the demonstration link can be found at the end of this description. click/copy.
1)soak bolts in penetrating oil and let the car sit for at least 2hrs
2) spray again
3) using the 2 hammers, place the ball end on any metal surrounding the bolt ( bushing hosing, mount, control arm)
4) hit the other end of the ball peen hammer with your other hammer using sharp motions to vibrate the rust loose
5) spray, tap, spray.
you will see dirty rust leaking out with the penetrating oil, this means the oil has seeped into the threads and is
removing the rust from the threads.
6) place impact on the first bolt, ideally work your way from the center of your car, towards the wheel (first bolt has the most torque,
and you need the stability of the other end of the arm in order
to break the first bolt loose.) I usually go from the inside, to the far outside, then go to the last bolt (strut bolt)
**DONT REMOVE ANY BOLTS!!!!! JUST LOOSEN THEM WHEN THE THREADS COME OUT, LEAVE THE BOLTS IN UNTIL THEY ARE ALL LOOSE**
7) In short busts: tighten pause loosen. Keep doing this until you see moment.
8) at this point, do longer bursts on the impact. You want more loosen, less tighten. spray in between.
IF THIS IS WORKING THEN SKIP HEAT, IF NO LUCK then hammer spray, impact heat.
do this a few times until bolt starts moving. PATIENCE IS KEY.
9)Thats it. It will backout. If you break the bolt using this method, the bolt was too far gone, and there was nothing
more you could do, this has worked 100% for me so far.
https://youtu.be/xwe6VqSw37A