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Unread 12-14-2008, 08:16 PM   #1
sebastian22
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Knuckle threads for Caliper bolts STRIPPED

I was doing my front brakes today and made a really STUPID move. I looked up the torque specs for the caliper bolts and it was 132 in/lbs. BUT I was a stupid idiot and set my torque wrench to 132 FT/lbs.

After a while the bolt just started spinning and when I realized what I was doing it was too late. I backed out the bolt and checked out the damage. The threads are completely stripped. I managed to thread the bolt back on and barely tighten it, but I am not comfortable driving it like that.

It was a stupid mistake and ruined an otherwise perfect day.

What are my options on fixing this? New knuckle?





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Unread 12-14-2008, 08:18 PM   #2
Turner
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re-tap it. just be very careful
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Unread 12-14-2008, 08:27 PM   #3
sebastian22
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Quote:
Originally Posted by Turner View Post
re-tap it. just be very careful
There is no meat left to re-tap. Cant really go a size bigger because the caliper mounting bolt has to stay the same otherwise it wont fit through the caliper sleeve.

I just found this...

http://vi.ebaydesc.com/ebaymotors/ws...dll%3FViewItem

Looks promising. Makes me feel a little better that I'm not the only idiot who stripped their caliper threads.
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Last edited by sebastian22; 12-14-2008 at 08:39 PM..
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Unread 12-14-2008, 08:29 PM   #4
joe's_yj
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maybe run a bolt with a nut and lock washer on the end?
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Unread 12-14-2008, 08:36 PM   #5
Turner
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Not trying to argue, but it looks like you could re-tap it with a bigger size, then drill the caliper bolt hole the same size for a larger bolt. I should have been more clear first. It can be done it would just take a little patience. If you were a little wary of doing that I would replace the entire knuckle. The eBay link didn't work for me...
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Unread 12-14-2008, 08:45 PM   #6
sebastian22
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Quote:
Originally Posted by Turner View Post
Not trying to argue, but it looks like you could re-tap it with a bigger size, then drill the caliper bolt hole the same size for a larger bolt. I should have been more clear first. It can be done it would just take a little patience. If you were a little wary of doing that I would replace the entire knuckle. The eBay link didn't work for me...
I got you, but I dont know how I feel about drilling all the way through the caliper sleeve.

I fixed the link. Looks like it is just an insert that is threaded on the inside and outside. I guess you drill and tap the hole, thread on the insert with some loctite, and youre done.
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Unread 12-14-2008, 08:50 PM   #7
Turner
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Yeah it wouldn't be hard for a machine shop to do. They have nice drill press' that can center the caliper to give a perfect hole.

Not sure exactly what the item does in the eBay link cause the description is kinda vague, but it does look like it would work. For 35 bucks you could give it a try. Good luck man!
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Unread 12-14-2008, 08:52 PM   #8
sebastian22
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Looks like I found my answer. I should have searched a little more before I posted.

Here is a write up using that same "Mr. Blaine kit" from ebay.

http://www.jeepforum.com/forum/showt...aliper+threads
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Unread 12-14-2008, 08:52 PM   #9
Old4X
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That is a standard repair. Heli-coil is one name brand for the threaded inserts. They sell a kit for each thread size, it comes with the proper size drill, the tap and some of the threaded inserts.

It will take you longer to run out and get the kit than it will for you to fix it.

BTW, 100 foot pounds is A Lot or torque.
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Unread 12-14-2008, 08:56 PM   #10
aaronc88
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looks like HeliCoils
heli coils will work just make sure u do them right.

u shold be able to pick up a whold helicoil kit from and industrial store.

I dunno what u have by u but around here we have Mcmastercarr and Grainger. For grainger u need to have a bussines name and adress but i just use the place that I work for as a name. Of course with thier permission.
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Unread 12-14-2008, 09:00 PM   #11
Turner
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Quote:
Originally Posted by sebastian22 View Post
Looks like I found my answer. I should have searched a little more before I posted.

Here is a write up using that same "Mr. Blaine kit" from ebay.

http://www.jeepforum.com/forum/showt...aliper+threads
Wow that was a pretty cool write-up! I would order that bad boy tonight.
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Unread 12-14-2008, 09:03 PM   #12
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Make sure you put some Green lock-tite on the heli-coil external threads. The green stuff dries super hard and will prevent it from backing out when you remove the caliper bolt next time. Red will also work, just use something stronger then Blue.
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Unread 12-14-2008, 09:10 PM   #13
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I've used this kit, great instructions, everything you need is in the kit. had a few issues with the shipping because a buddy used his ebay account to order it for me, that had some jacked up shipping address. mrblaine shipped another one out to me the day we figured out the problem. Very helpful!! Go for it!
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Unread 12-14-2008, 09:15 PM   #14
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we use these kits at the place i work (they work good) and id use green lock-tite or at least red but not blue make sure you don't get it on the caliper bolts though
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Unread 12-14-2008, 09:44 PM   #15
UltimatE
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Originally Posted by hotrod_hooligan View Post
I've used this kit, great instructions, everything you need is in the kit. <more> Very helpful!! Go for it!
x2. I stripped the caliper mounting bolts on my grand cherokee's left front knuckle beginning of the year. I ordered this kit, installed the threaded inserts, and have been running it that way ever since.
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