User Tag List

Reply
 
Thread Tools Rate Thread Display Modes
Old 06-04-2023, 04:49 PM #1
ShredTheGnar ShredTheGnar is offline
Junior Member
 
Join Date: Aug 2012
Location: Breckenridge, CO
Posts: 5
ShredTheGnar is on a distinguished road
ShredTheGnar ShredTheGnar is offline
Junior Member
 
Join Date: Aug 2012
Location: Breckenridge, CO
Posts: 5
ShredTheGnar is on a distinguished road
HELP! Cross-threaded Caliper mount bolt holes

'18 4runner. Was replacing my wife's front pads and rotors today, got the first side done in less than a half hour, second side even quicker and as I go to put in my last caliper mount bolt to finish the job I discover it is cross-threaded. The hole itself ("knuckle"?) where the caliper is bolted to the vehicle, not the bolt itself but the female hole where the caliper mount bolt goes into. The threads are all tore up right at the entrance where the bolt goes in. Cannot get the bolt in, just spins and won't start. So I did some research and saw that a heli-coil repair is an option, but I've never done that before. A couple of questions:

Is there any other trick anyone knows of for this situation to essentially re-thread just the first couple threads on the hole? I can see the damage at the opening of the hole but then further back the threads are perfectly fine.

If I need to go the heli-coil route what is the diameter size I should buy? I keep getting a 1/2 inch kit popping up when I search but I'm not sure of the exact diameter of the 4runner bolts or the size I should get?

Does anyone have a link to a write up or better yet a video on anyone doing this on a 4runner?

Thanks
ShredTheGnar is offline   Reply With QuoteReply With Quote
Old 06-04-2023, 05:00 PM #2
KKD989's Avatar
KKD989 KKD989 is offline
Member
 
Join Date: Jan 2019
Location: NC
Posts: 86
KKD989 will become famous soon enough
KKD989 KKD989 is offline
Member
KKD989's Avatar
 
Join Date: Jan 2019
Location: NC
Posts: 86
KKD989 will become famous soon enough
Is it a small enough section of threads that you could run a tap through and clean them up?
__________________
2019 TRD OR: TRD CAI | Gibson Elite Cat-back | Wildpeak AT3W 265/70/R17 | Anytime Backup Camera/Front Camera | TRD Pro Skidplate | Victory 4x4 Crossbars | ARB Diff & Locker Breather Relocate | Apex Overland Front Recovery Points | LFD Sliders | GS59-700/C59-300 | GS59-705/C59-599 | Dobinsons UCAs | Greenlane Offroad Ladder
KKD989 is offline   Reply With QuoteReply With Quote
Old 06-04-2023, 05:39 PM #3
CavPro's Avatar
CavPro CavPro is offline
Member
 
Join Date: Aug 2018
Location: N California (really, 4 hours N of SF)
Posts: 333
CavPro has a spectacular aura about CavPro has a spectacular aura about CavPro has a spectacular aura about
CavPro CavPro is offline
Member
CavPro's Avatar
 
Join Date: Aug 2018
Location: N California (really, 4 hours N of SF)
Posts: 333
CavPro has a spectacular aura about CavPro has a spectacular aura about CavPro has a spectacular aura about
start all bolts/nuts by hand.
__________________
1973 Datsun 240z (traded in for ---->) 1981 Toyota 4x4 Deluxe LB (avatar) stolen while sitting with For Sale sign on it / 1987 Chevrolet Suburban 4x4, workhorse - sold / 1984 Buick Grand National - Totaled, rear-ended / 1986 Buick Grand National - Sold then restified, lives in SF now / 1994 Toyota Camry - 240k - Taken to Austin Tx by son, traded in on VW GTI sport / 2001 Ford Excursion 7.3 212k - still pulling Arctic Fox Trailer - This is the shtf vehicle / 2018 Toyota 4runner TRD Pro Cavalry Blue
CavPro is offline   Reply With QuoteReply With Quote
Old 06-04-2023, 05:45 PM #4
kenwilliams0803 kenwilliams0803 is offline
Member
 
Join Date: Mar 2017
Posts: 526
kenwilliams0803 has a spectacular aura about kenwilliams0803 has a spectacular aura about kenwilliams0803 has a spectacular aura about
kenwilliams0803 kenwilliams0803 is offline
Member
 
Join Date: Mar 2017
Posts: 526
kenwilliams0803 has a spectacular aura about kenwilliams0803 has a spectacular aura about kenwilliams0803 has a spectacular aura about
Tap. Use cutting oil too. Should clean them up. Turn the steering wheel one way or another to get clearance to get in there.

Sent from my SM-S901U using Tapatalk
kenwilliams0803 is offline   Reply With QuoteReply With Quote
Old 06-04-2023, 10:02 PM #5
fkheath fkheath is offline
Senior Member
 
Join Date: Sep 2020
Location: Utah
Posts: 1,539
fkheath is a splendid one to behold fkheath is a splendid one to behold fkheath is a splendid one to behold fkheath is a splendid one to behold fkheath is a splendid one to behold fkheath is a splendid one to behold fkheath is a splendid one to behold
fkheath fkheath is offline
Senior Member
 
Join Date: Sep 2020
Location: Utah
Posts: 1,539
fkheath is a splendid one to behold fkheath is a splendid one to behold fkheath is a splendid one to behold fkheath is a splendid one to behold fkheath is a splendid one to behold fkheath is a splendid one to behold fkheath is a splendid one to behold
As others have said, a tap. But be aware there are two kinds of taps. One has a pointed end and the threads are gradual. Use that kind. The other kind of tap, called a bottom tap, looks blunt and threads start very quickly. It is called a bottom tap for it is meant to tap a blind hole to the bottom.

Is there access on the back side? If so, start your tap on the back, not the front, then it will clean out the bad threads.

Just for your info. Helicoils are weak. Don't use them. It is much better to use a Time-sert which is stronger. (++ TIME-SERT Official Threaded inserts for stripped threads, blown out sparkplugs,).
fkheath is offline   Reply With QuoteReply With Quote
Old 06-05-2023, 12:46 PM #6
Mike Beyers Mike Beyers is offline
Member
 
Join Date: Mar 2011
Location: Bordentown, NJ
Posts: 82
Mike Beyers is on a distinguished road
Mike Beyers Mike Beyers is offline
Member
 
Join Date: Mar 2011
Location: Bordentown, NJ
Posts: 82
Mike Beyers is on a distinguished road
Chaser

Before you invest in a tap, you might want to try to make a chaser. Find out what size the bolt is, and the thread pitch as well. Get a new bolt, and use a round file to file a flute, like a tap has, into the bolt. You might want to do two or three flutes. Try threading this in, and it may clean up the threads. Look up Spark Plug Chaser, and it will give you the idea.
Mike Beyers is offline   Reply With QuoteReply With Quote
Reply

Tags
4runner , bolt , caliper , hole , threads

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
What are these threaded holes for on the OEM skid plate? boyfester 5th gen T4Rs 2 04-11-2023 07:11 PM
Bolt for threaded holes under hood Moto69Joe 5th gen T4Rs 3 04-27-2015 08:50 AM
Threaded holes on frame rails JAD 5th gen T4Rs 6 04-27-2014 03:34 PM
What to do with cross threaded skid plate bolt? bigwebb83 4th Gen T4Rs 5 04-18-2011 09:55 PM
Broken Caliper Mount Bolt ARG! mvonwahlde 3rd gen T4Rs 3 11-08-2010 02:15 PM

Powered by vBadvanced CMPS v3.2.2

All times are GMT -4. The time now is 09:09 PM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.
Feedback Buttons provided by Advanced Post Thanks / Like (Lite) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Lite) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.
***This site is an unofficial Toyota site, and is not officially endorsed, supported, authorized by or affiliated with Toyota. All company, product, or service names references in this web site are used for identification purposes only and may be trademarks of their respective owners. The Toyota name, marks, designs and logos, as well as Toyota model names, are registered trademarks of Toyota Motor Corporation***Ad Management plugin by RedTyger
 
Copyright © 2020