You are right to be worried about heating the aluminum to much. Picture of what the nut looked like after the war was over.
Let me get a picture uploaded here real quick. The other thing we are accomplishing with heat is weakening the steel to the point that hammer on the socket shapes the steel to have new flat faces to pry against. If there is any friction fit or interference fit from the oxidation the expansion can be enough to reduce the force needed to take the bolt out. This means for each degree you heat the aluminum it will expand twice as much as the steel bolt. Aluminum alloys have a coefficient of linear expansion between 21 and 24. Sending heat into the the bolt and therefore the aluminum will allow each to expand.
What we are going for with the extreme heat is to weaken the rust/contact weld that has occurred between the bold and the hole. You can try a propane torch but like you said it's much cooler. These are the two bigsert kits you can use to fix the threads on Subaru brake calipers:Īlso here is the youtube video where the guy tests the pull out strength of all the common thread repair methods: He (or she) will be able to get a hold of a torch and help you use it. If you can't get a hold of a torch ask around your friend group to find a welder. If you don't have all of the above tools you will want to find a local DIY garage or a friend with a well stocked garage. You can of course try your extractors one more time after allowing a proper soak of the penetrating oil or the other tricks mentioned above. If it does damage threads say hello to a big cert kit. Use the air ratchet, make sure it's on reverse, and pray it takes the bolt out without damaging any threads. Grab that one-dress-size-too-small socket and quickly hammer it on to German specifications (gutentight)ģ. be careful not to point the flame past your bolt head to anything important.Ģ. Use the torch with a blue flame to heat until the bolt is glowing red almost orange. Also do one last prep of the penetrating oil before hand.ġ. Get all of your tools handy an near by because you don't want to waste time trying to grab one. A 6 sided impact socket 1 size smaller 17mm bolt -> 16mm ratchet If this doesn't work you are cutting the bolt head off, drilling out the bolt and using a big cert kit (it's been tested to be the strongest). Peace out from your final bastion when the bolt is completely rounded is the following no turning back method. So guys please help me out here I'd be so greatful. What should be my next move? I don't wanna go crying to the mechanic like a little wuzz. The bolt head is now abused and deformed beyond recognition. Before I knew it the bolt was stripped.Īfter that I've done countless rounds of WD40, hit it with the torch for what seems like hours, I've used a special spray to cool it down to -40 celsius, I've hit it with the angle grinder to square it up a lil' bit but guys nothing is happening! After doing that for some time and realizing that hey this just isn't going anywhere I started the next step with another wrench to get leverage and so on. To begin with I just clanked the wrench with a hammer yak-yak-yak like you'd normally do to loosen these fellas up a little before going all the way. What's up guys representing from north of norway where subies are in their right element defeating winter every day with snow most of the year here.Īnyway guys as much as I love my 2011 subaru legacy premium estate I'm kinda gettin my balls kicked a lot by this one stupid son of a **tch caliper bracket bolt that seems to just be _beyond_ seized.
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