User Tag List

Reply
 
Thread Tools Rate Thread Display Modes
Old 03-07-2021, 12:45 AM #1
Clarkson! Clarkson! is offline
Member
 
Join Date: Jun 2020
Location: Charlotte, NC
Posts: 37
Real Name: Tristan
Clarkson! is on a distinguished road
Clarkson! Clarkson! is offline
Member
 
Join Date: Jun 2020
Location: Charlotte, NC
Posts: 37
Real Name: Tristan
Clarkson! is on a distinguished road
Angry Help - sheared bolts in head

So this afternoon I thought I would do a simple valve cover gasket replacement. Unfortunately, in the process 6 bolts sheared off. 4 of them are sticking out from the head enough I think I can get them with heat and vice grips. However, 2 are just slightly above flush with the head and need to be drilled out. I thought maybe I could disconnect the engine mount and lift the engine enough to be able to drill them out, but I don't see how I can get access to the engine mount. Any suggestions on how I can get at these and remove them is appreciated!
__________________
2005 SR5 4WD: V8 - Doug Thorley headers, Bilstein 5100s, Slee offroad steel brake lines, Tundra brake swap, JBA upper control arms, 33s on RockTrix wheels, etc.
Clarkson! is offline   Reply With QuoteReply With Quote
Old 03-07-2021, 08:36 AM #2
Tuyrunner's Avatar
Tuyrunner Tuyrunner is offline
Member
 
Join Date: Mar 2021
Posts: 43
Tuyrunner is on a distinguished road
Tuyrunner Tuyrunner is offline
Member
Tuyrunner's Avatar
 
Join Date: Mar 2021
Posts: 43
Tuyrunner is on a distinguished road
Quote:
Originally Posted by Clarkson! View Post
So this afternoon I thought I would do a simple valve cover gasket replacement. Unfortunately, in the process 6 bolts sheared off. 4 of them are sticking out from the head enough I think I can get them with heat and vice grips. However, 2 are just slightly above flush with the head and need to be drilled out. I thought maybe I could disconnect the engine mount and lift the engine enough to be able to drill them out, but I don't see how I can get access to the engine mount. Any suggestions on how I can get at these and remove them is appreciated!

I broke off the rear bolt in the drivers side I ended up cutting a drill bit in half and using a right angle drill and was able to drill it out. It was a massive pain in the butt though. Hopefully you can get to them without disconnecting everything.


Sent from my iPhone using Tapatalk
Tuyrunner is offline   Reply With QuoteReply With Quote
Old 03-07-2021, 08:59 AM #3
Clarkson! Clarkson! is offline
Member
 
Join Date: Jun 2020
Location: Charlotte, NC
Posts: 37
Real Name: Tristan
Clarkson! is on a distinguished road
Clarkson! Clarkson! is offline
Member
 
Join Date: Jun 2020
Location: Charlotte, NC
Posts: 37
Real Name: Tristan
Clarkson! is on a distinguished road
Thanks for the suggestion, will give that a shot
__________________
2005 SR5 4WD: V8 - Doug Thorley headers, Bilstein 5100s, Slee offroad steel brake lines, Tundra brake swap, JBA upper control arms, 33s on RockTrix wheels, etc.
Clarkson! is offline   Reply With QuoteReply With Quote
Old 03-07-2021, 12:06 PM #4
Syr4RinNC's Avatar
Syr4RinNC Syr4RinNC is offline
Member
 
Join Date: Jan 2019
Location: Central NY
Posts: 794
Syr4RinNC is a jewel in the rough Syr4RinNC is a jewel in the rough Syr4RinNC is a jewel in the rough Syr4RinNC is a jewel in the rough
Syr4RinNC Syr4RinNC is offline
Member
Syr4RinNC's Avatar
 
Join Date: Jan 2019
Location: Central NY
Posts: 794
Syr4RinNC is a jewel in the rough Syr4RinNC is a jewel in the rough Syr4RinNC is a jewel in the rough Syr4RinNC is a jewel in the rough
Honestly it’s going to be a long frustrating process. If I were to have to drill out bolts again- I’d probably just take it to a shop.

If you know anyone who can weld - you can see if you can weld a bit to the top and extract it that way though probably not if there’s not a lot of room on top
__________________
2008 SR5 4WD Black. Bilstein 5100, 5th gen coils/ rear springs. 255 80 17 AT for everyday use. Victory Sliders. Victory Front bumper with winch/ lightbar. headunit upgrade. Back up camera install. Expert at replacement rear hatches

All you need to go off road is to be willing to get some scrapes and dents along the way
Syr4RinNC is offline   Reply With QuoteReply With Quote
Old 03-07-2021, 02:01 PM #5
Adeadwallnut Adeadwallnut is offline
Junior Member
 
Join Date: Jul 2020
Location: Vancouver
Posts: 26
Adeadwallnut is on a distinguished road
Adeadwallnut Adeadwallnut is offline
Junior Member
 
Join Date: Jul 2020
Location: Vancouver
Posts: 26
Adeadwallnut is on a distinguished road
I am unfortunately in the exact same situation. This happens beacuse the its steel to aluminium and the bottom of the bolts are easily exposed to moisture so they tend to rust. You can still get the valve cover off as the valve cover is not threaded and get some vice grips on the bolt. Soak in penetrating oil for as long as possible before and you may just get lucky. Before you drill them out you can also try with a screw extractor.
Adeadwallnut is offline   Reply With QuoteReply With Quote
Old 03-07-2021, 03:37 PM #6
Clarkson! Clarkson! is offline
Member
 
Join Date: Jun 2020
Location: Charlotte, NC
Posts: 37
Real Name: Tristan
Clarkson! is on a distinguished road
Clarkson! Clarkson! is offline
Member
 
Join Date: Jun 2020
Location: Charlotte, NC
Posts: 37
Real Name: Tristan
Clarkson! is on a distinguished road
Still no luck...the studs that were protruding are now breaking off and Im getting closer to having to drill. The problem is, even with an offset drill I dont have enough clearance. Thinking if I can just disconnect the engine mount, I can jack up the engine a couple inches to get at it, but dont see an easy way to do that. Any suggestions on unbolting the engine mount?
__________________
2005 SR5 4WD: V8 - Doug Thorley headers, Bilstein 5100s, Slee offroad steel brake lines, Tundra brake swap, JBA upper control arms, 33s on RockTrix wheels, etc.
Clarkson! is offline   Reply With QuoteReply With Quote
Old 03-07-2021, 03:44 PM #7
Charlievee's Avatar
Charlievee Charlievee is offline
Senior Member
 
Join Date: Jul 2018
Location: Where ever the Army puts me.
Posts: 1,252
Charlievee is a name known to all Charlievee is a name known to all Charlievee is a name known to all Charlievee is a name known to all Charlievee is a name known to all Charlievee is a name known to all
Charlievee Charlievee is offline
Senior Member
Charlievee's Avatar
 
Join Date: Jul 2018
Location: Where ever the Army puts me.
Posts: 1,252
Charlievee is a name known to all Charlievee is a name known to all Charlievee is a name known to all Charlievee is a name known to all Charlievee is a name known to all Charlievee is a name known to all
Never played this game on a Toyota, but have played it plenty. Don't waste time on e-z outs, all they do is break and make it more difficult. Get a good set of drill bits start small and work your way up in size. The bolt should extract prior to damage to the threads. Good luck.
__________________
2018 TRD Off Road Premium. Eibach Pro, JBA, Toyo's, TRD cai.
Charlievee is offline   Reply With QuoteReply With Quote
Old 03-07-2021, 06:23 PM #8
Syr4RinNC's Avatar
Syr4RinNC Syr4RinNC is offline
Member
 
Join Date: Jan 2019
Location: Central NY
Posts: 794
Syr4RinNC is a jewel in the rough Syr4RinNC is a jewel in the rough Syr4RinNC is a jewel in the rough Syr4RinNC is a jewel in the rough
Syr4RinNC Syr4RinNC is offline
Member
Syr4RinNC's Avatar
 
Join Date: Jan 2019
Location: Central NY
Posts: 794
Syr4RinNC is a jewel in the rough Syr4RinNC is a jewel in the rough Syr4RinNC is a jewel in the rough Syr4RinNC is a jewel in the rough
Quote:
Originally Posted by Charlievee View Post
Never played this game on a Toyota, but have played it plenty. Don't waste time on e-z outs, all they do is break and make it more difficult. Get a good set of drill bits start small and work your way up in size. The bolt should extract prior to damage to the threads. Good luck.
Agree - easy outs are designed for screw heads. With bolts get a high quality drill bit for steel carbide tipped, diamond tipped etc
__________________
2008 SR5 4WD Black. Bilstein 5100, 5th gen coils/ rear springs. 255 80 17 AT for everyday use. Victory Sliders. Victory Front bumper with winch/ lightbar. headunit upgrade. Back up camera install. Expert at replacement rear hatches

All you need to go off road is to be willing to get some scrapes and dents along the way
Syr4RinNC is offline   Reply With QuoteReply With Quote
Old 03-07-2021, 09:12 PM #9
thennen's Avatar
thennen thennen is offline
Senior Member
 
Join Date: Aug 2018
Location: Ohio
Posts: 1,596
thennen is a splendid one to behold thennen is a splendid one to behold thennen is a splendid one to behold thennen is a splendid one to behold thennen is a splendid one to behold thennen is a splendid one to behold thennen is a splendid one to behold thennen is a splendid one to behold
thennen thennen is offline
Senior Member
thennen's Avatar
 
Join Date: Aug 2018
Location: Ohio
Posts: 1,596
thennen is a splendid one to behold thennen is a splendid one to behold thennen is a splendid one to behold thennen is a splendid one to behold thennen is a splendid one to behold thennen is a splendid one to behold thennen is a splendid one to behold thennen is a splendid one to behold
Along with what Charlievee said, if you can get a good set of reverse drill bits, you might actually get a bolt or two to begin backing out while drilling. Do the first pilot holes with standard bits, and switch to the reverse ones as you’re approaching the bolt diameter. They may just drill holes, which won’t hurt anything. But may be worth a shot.
thennen is offline   Reply With QuoteReply With Quote
Old 03-08-2021, 05:52 AM #10
triethylborane triethylborane is offline
Member
 
Join Date: Oct 2020
Location: Denver, CO
Posts: 107
triethylborane will become famous soon enough
triethylborane triethylborane is offline
Member
 
Join Date: Oct 2020
Location: Denver, CO
Posts: 107
triethylborane will become famous soon enough
IIRC the V8 has some hard lines along the passenger side firewall aft of the head, right above the valve cover fasteners . . . raising the engine is the ticket? Or lowering? If you cant get clearance for tools, then this is a problem. Even if you did get it dead on center, it could still be an issue with misuse of extractors or even broken drill bits. Im usually one to take the risk, but even so I have gone to a machine shop from time to time after a broken carbide bit in a sheared valve cover fastener in a head or for some other seized fastener.

As for attempting removal in-situ, the previous replies are pretty much on the money. However, welding would be risky on such a small fastener that is just above or flush to the machined surface of the head and I would only go with TIG and an operator that pretty much does it for a living. There is a not-insignificant risk that welding would damage the machined surface of the head, which could place the head completely out of machinable spec. TIG and operator skill mitigates this risk somewhat.

The only bit you should bother with for material removal is a carbide tipped or full carbide OAL bit in right hand. Reverse/left hand bits need to be able to flex a bit and are usually some type of high speed steel.

Extractors/EZ Outs are designed for use in the circumstance where the fastener shears due to over application of torque, not corrosion. So skip this all together as mentioned by other members. Good advice, dont get tempted into it.

Broken tooling needs a machine shop that can extract it or use a EDM/MDM/tool disintegrator. Pretty slick, there are portable EDMs, but these would not work here as the electrode needs to be on center with the fastener.

If the drills cannot be placed dead center, this is going to be a rough one. Nothing a time-sert couldnt handle.
triethylborane is offline   Reply With QuoteReply With Quote
Old 03-08-2021, 11:05 AM #11
gimlithepirate gimlithepirate is offline
Member
 
Join Date: Nov 2019
Location: New Mexico
Posts: 511
gimlithepirate is a jewel in the rough gimlithepirate is a jewel in the rough gimlithepirate is a jewel in the rough
gimlithepirate gimlithepirate is offline
Member
 
Join Date: Nov 2019
Location: New Mexico
Posts: 511
gimlithepirate is a jewel in the rough gimlithepirate is a jewel in the rough gimlithepirate is a jewel in the rough
This is definitely not the thread I wanted to see before I tackle my valve cover gasket this week... Especially since I've already sheared one bolt off in the block which makes me think there is some risk this happens to me.

Maybe I should just go spray all the bolts in penetrating oil *NOW*
__________________


2007 v8 4Runner Limited Build thread: https://www.toyota-4runner.org/4th-g...ing-build.html
gimlithepirate is offline   Reply With QuoteReply With Quote
Old 03-08-2021, 01:59 PM #12
BlackWorksInc's Avatar
BlackWorksInc BlackWorksInc is offline
Elite Member
 
Join Date: Feb 2011
Location: Bend, OR
Posts: 9,906
BlackWorksInc is a splendid one to behold BlackWorksInc is a splendid one to behold BlackWorksInc is a splendid one to behold BlackWorksInc is a splendid one to behold BlackWorksInc is a splendid one to behold BlackWorksInc is a splendid one to behold BlackWorksInc is a splendid one to behold BlackWorksInc is a splendid one to behold
BlackWorksInc BlackWorksInc is offline
Elite Member
BlackWorksInc's Avatar
 
Join Date: Feb 2011
Location: Bend, OR
Posts: 9,906
BlackWorksInc is a splendid one to behold BlackWorksInc is a splendid one to behold BlackWorksInc is a splendid one to behold BlackWorksInc is a splendid one to behold BlackWorksInc is a splendid one to behold BlackWorksInc is a splendid one to behold BlackWorksInc is a splendid one to behold BlackWorksInc is a splendid one to behold
Have not run into this in a while, must be a rust belt thing; salt causing a galvanic corrosion issue maybe?

Anyways, I would see if you can find a right angle drill (I think Harbor Freight has them rather cheap) that should help get the angles you need on some of the bolts (not sure which ones broke off on you, but I suspect the pain in the ass ones of course.) Get a set of reverse drill bits like others have said and start small, drill up, take your time. I would also get a file and a self-centering punch if you have one; the more you can ensure the drill bit is on center, the better it will be.

As for the engine mount bolts, they're 14mm and you can access them from the wheel well area; it's not particularly easy to get to one or two of them and I imagine if you're in NC that the rest of the vehicle is probably rusty so they will be a ***** to get loose if you can.

Post Note-

I should mention the thread pitch on those is 6x1.0mm so you won't want to go too much bigger than a 5mm drill bit or you might wipe the threads out.
BlackWorksInc is offline   Reply With QuoteReply With Quote
Old 03-08-2021, 02:32 PM #13
Drcoffee's Avatar
Drcoffee Drcoffee is offline
Senior Member
 
Join Date: Jan 2012
Location: Somewhere, yet nowhere
Posts: 1,739
Drcoffee is just really nice Drcoffee is just really nice Drcoffee is just really nice Drcoffee is just really nice Drcoffee is just really nice
Drcoffee Drcoffee is offline
Senior Member
Drcoffee's Avatar
 
Join Date: Jan 2012
Location: Somewhere, yet nowhere
Posts: 1,739
Drcoffee is just really nice Drcoffee is just really nice Drcoffee is just really nice Drcoffee is just really nice Drcoffee is just really nice
Dremmel a cut for a standard screwdriver. Then heat them with a plumbers torch until they smoke, then screw them out. Heat is your best friend.
__________________
2007 4Runner Sport 4WD 4.0L 228,000 miles
The real stats on gun murders in America compared to the world (link)
Good riddance to the Clinton Crime Family--> I Voted TRUMP…how’s it going for you now Trump is gone? Be careful what you ask for. You may just get it.
Drcoffee is offline   Reply With QuoteReply With Quote
Old 03-08-2021, 03:37 PM #14
Nickname's Avatar
Nickname Nickname is offline
Member
 
Join Date: Apr 2018
Location: Littleton, CO
Posts: 89
Nickname is on a distinguished road
Nickname Nickname is offline
Member
Nickname's Avatar
 
Join Date: Apr 2018
Location: Littleton, CO
Posts: 89
Nickname is on a distinguished road
Patience, heat, and penetrating oil (50/50 acetone and ATF). I'm a bit of a pro at shearing off bolts so I've had some practice haha
__________________
06 Galactic Limited on 33's, Rear locker, Bilstein 5100s, Toytec 2" Superflex Springs, Whitson Metalworks Rack, Squadron Sport Ditch Lights, Dual Viair 450cc Air compressors with 2.5 gal tank, Cobra 75WXST CB Radio
Build Thread:https://www.toyota-4runner.org/4th-g...ld-thread.html
Nickname is offline   Reply With QuoteReply With Quote
Old 03-08-2021, 04:14 PM #15
duffdog duffdog is offline
Member
 
Join Date: Mar 2015
Location: Sacramento CA
Posts: 683
duffdog is a jewel in the rough duffdog is a jewel in the rough duffdog is a jewel in the rough
duffdog duffdog is offline
Member
 
Join Date: Mar 2015
Location: Sacramento CA
Posts: 683
duffdog is a jewel in the rough duffdog is a jewel in the rough duffdog is a jewel in the rough
After fiddling with something for 2 days, I would have just removed it and taken it to a machine shop. Using a drill and getting invisible metal shavings in the engine is just going to destroy both cams and all the cam caps, leaving you with a trashed motor.
__________________
2005 Blue SR5 v8

3" suspension lift, 1" body lift, 315's, rear Elocker, on-board air system, slider air tanks, full skid plates, front Demello bumper, rear HMF plate/tube bumper, rear 9000lb hidden winch, front 10000lb winch, dual electric fans (in cab adjustable temp), rock lights, 25W LED projector lights.
duffdog is offline   Reply With QuoteReply With Quote
Reply

Tags
bolts , engine , head , mount , thought

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
Sheared Rear sway bar bolts snydmax 3rd gen T4Rs 4 04-22-2020 01:05 PM
Oil dipstick broke off b/c of sheared-off bolt head – Suggestions? eric_rosenwald 3rd gen T4Rs 9 10-11-2017 06:58 PM
Sheared bolts and seized bolts. Need help. mavrick1903 4th Gen T4Rs 8 07-18-2017 01:33 PM
Bolts sheared off of LBJ Dous 3rd gen T4Rs 39 06-27-2012 08:58 AM
Front Skid Plate Bolts Rusted/Sheared Off? EzyGlider 4th Gen T4Rs 4 10-03-2011 08:52 AM

Powered by vBadvanced CMPS v3.2.2

All times are GMT -4. The time now is 12:48 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