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Caliper bolt + torque question

Discussion in 'Gen 3 Prius Main Forum' started by Michael Mathis, Jun 30, 2020.

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  1. Michael Mathis

    Michael Mathis Junior Member

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    Ah, I see. The aluminum is originally in the thread, not the bolt. That's why my words were confusing to you. I assumed the bolt carried the aluminum coil. That also explains why Mendel was puzzled by the disparity in bolts.

    Thank you making that clear (and saving me 24 hours). I will buy a new bracket and bolts. That's more in my skill set than Timesert.

    I did set out to just change pads, but since they last so long in a Prius, figured I would do a thorough cleaning and re-greasing of all components. Was also curious to see how everything fit together and worked. That's why I removed the M12 bolts.

    Got it mostly right, but I'm glad there are experts like you guys around to advise -- thanks.
     
    #21 Michael Mathis, Jul 1, 2020
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  2. Michael Mathis

    Michael Mathis Junior Member

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    "One of the bolts stretched? Or is held nearer the camera?"

    The bolts are identical except for the coil wrapped around one. The one on the right is held slightly higher and a bit farther from the camera. That's due to trying to line up two round-headed bolts in one hand.
     
    #22 Michael Mathis, Jul 1, 2020
  3. ASRDogman

    ASRDogman Senior Member

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    timesert must be new. I've never heard of it. Helicoil is what we used.
    Guess it's just another brand name.
    Just call some just yards and get a used brake caliper. And just use the bracket.
    That is the least expensive and quickest. The bolts are fine.
    Save the damaged one and take it to repair shop and ask them how much to put a heli coil or timesert in it.

    Before you put the bolt back in, wire brush them to clean them up. And do not over torque them!
     
    #23 ASRDogman, Jul 1, 2020
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  4. Michael Mathis

    Michael Mathis Junior Member

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    Rode my Burgman 650 to the dealer this morning (thank goodness for backup transportation).

    Bought a new bracket and two bolts. Paid $130, higher than internet prices but worth it to me because I can pick it up at 7:00 a.m. tomorrow. As Chapman cleverly noted, "not cheap, but not outrageous for tuition."
     
    #24 Michael Mathis, Jul 1, 2020
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  5. ChapmanF

    ChapmanF Senior Member

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    I, too, had only helicoiled in the past, and hadn't heard of timesert, but it's a somewhat heavier-duty thing, more like an internally/externally threaded bushing than just a coil.

    On the other hand, that means you remove more original material. One comparison article I read pointed out that if you try a helicoil and it goes south, you might still save the day with a timesert ... but not vice versa.

    Bought a socket extension yet so you can use that torque wrench for reassembly? :)
     
    #25 ChapmanF, Jul 1, 2020
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  6. Mendel Leisk

    Mendel Leisk Senior Member

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    Regarding helicoal/timesert: our daughter's kitchen cupboards (Ikea's finest, going on 40 years old...) regularly have doors coming off, due to hinge screws enlarging the holes they once fit tightly in. I'm getting fairly adept at drilling the holes out to various oversized id's, tapping in hardwood dowels (liberally buttered up with wood glue), then drilling out fresh holes for the hinge screws. Similar process.
     
    #26 Mendel Leisk, Jul 1, 2020
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  7. Michael Mathis

    Michael Mathis Junior Member

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    "Bought a socket extension yet so you can use that torque wrench for reassembly?"

    Indeed I did, yesterday.

    For $3.99 and a little patience, I could have avoided all this.

    Can't complain, though. I did learn some good things.
     
    #27 Michael Mathis, Jul 1, 2020
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  8. ASRDogman

    ASRDogman Senior Member

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    Use wood toothpicks with the wood glue.
    You can push them in and then brake them off, after filling with the glue.
    A little sanding, or using a razor blade to smooth it out.

    It all depends on how big the hole is.

     
    #28 ASRDogman, Jul 1, 2020
  9. ChapmanF

    ChapmanF Senior Member

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    My mom's old house had a kitchen cupboard with a rotating carousel inside, that she wanted me to fix when she put the house up for sale. Screw threads at the central hub had been stripped out from 30 years of repeated attempts to retighten after getting loose. Looked like a perfect job for some helicoils.

    Of course it would be helicoils in a size I don't have, meaning I also didn't have the helicoil tooling for that size, and would have had to buy the whole helicoil starter set for that size, to get the coils and the right bit and installer. And then install 3 coils and have the set left over.

    I mentioned that to the fellow at the auto parts store, and he suggested I just buy some coils and contact a guy up the way who restores vintage tractors. Ended up going there and trading a box of coils for labor, and got the three coils expertly installed in the carousel hub in his well-organized machine shop while shooting the breeze about old tractors,
     
    #29 ChapmanF, Jul 1, 2020
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  10. Michael Mathis

    Michael Mathis Junior Member

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    Quick closure: picked up the new bracket and M12 bolts at the dealer, transferred over the caliper pins, rubber boots, metal clips and pads from the old bracket, installed and torqued to 101 ft. lbs.

    Now I don't have to drive around for the next five years "humming loudly" about my possibly-stripped bolt and hoping it "will go away in the summer when it gets warm" (haha, I still get a kick out of that).

    Thanks to all who chipped in. It's appreciated.
     
    #30 Michael Mathis, Jul 2, 2020
    Last edited: Jul 2, 2020
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