Stripped Intake Manifold bolt - HELP

Stock FSJ Tech Area
Post Reply

Topic author
JeepNorris
Posts: 16
Joined: Wed Dec 02, 2020 7:22 am

Stripped Intake Manifold bolt - HELP

Post by JeepNorris » Mon Jun 07, 2021 11:58 am

Accepting solutions / recommendations to get the last intake manifold bolt loose with a rounded head.
Here's what I've done so far:

-soaked the area w/ PB Blaster
-used box wrench
-used adjustable wrench
-applied heat and used vice grips

Dumbass engineers molded the carb support in the worst spot for accessing this bolt. :banghead:
You do not have the required permissions to view the files attached to this post.

User avatar

tgreese
Posts: 4732
Joined: Fri Jun 08, 2012 6:31 am
Location: Medford MA USA

Re: Stripped Intake Manifold bolt - HELP

Post by tgreese » Mon Jun 07, 2021 12:13 pm

The Bolt-Out sockets work really well. You'll need enough space around the bolt to accommodate the Bolt-Out socket.
https://www.amazon.com/Craftsman-Piece- ... B007C6KLMC

Or, you can put a carbide bit in your die grinder and grind off the head of the bolt. Then with the manifold off, grab the remaining bolt with vice grips to turn it out.
Last edited by tgreese on Mon Jun 07, 2021 12:22 pm, edited 1 time in total.
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
Dual Everything: '15 FCA Jeep Cherokee KL Trailhawk, ECO Green
Blockchain the vote.

User avatar

tgreese
Posts: 4732
Joined: Fri Jun 08, 2012 6:31 am
Location: Medford MA USA

Re: Stripped Intake Manifold bolt - HELP

Post by tgreese » Mon Jun 07, 2021 12:17 pm

If it's totally inaccessible except from the side, you can possible grab it with vice grip pliers and turn it a little. Pick pliers that fit in the space that you have.

Or use a cold chisel, and rotate the bolt by hitting the face of the hex from an angle to rotate the bolt CCW. If you can get it to turn a little, you might then be able to continue turning with vice grips with a narrow head.

The Knipex Cobra pliers are great, and may be able to get in there from the side. The Knipex pliers wrench is excellent too.
https://www.amazon.com/knipex-cobra-pli ... n%3A228013
https://www.amazon.com/s?k=knipex+plier ... _sb_noss_1
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
Dual Everything: '15 FCA Jeep Cherokee KL Trailhawk, ECO Green
Blockchain the vote.

User avatar

1978J10REDWHITE
Posts: 130
Joined: Fri Nov 20, 2020 7:25 pm

Re: Stripped Intake Manifold bolt - HELP

Post by 1978J10REDWHITE » Mon Jun 07, 2021 12:28 pm

Isolate fuel lines - remove Carb, isolate anything like wires , etc first etc.
If you haven’t used a larger set of vice grips to pinch bolt head try that.
Else, Then, heat it up, us a a torch on it, maybe 5-10 seconds worth, as it cools, squirt again with blaster , grip head with vice grips, while its fairly hot and twist, TIGHTEN direction first then loosen , back & forth little but till it turns and can be worked Out.

Secondly, tack weld a another NUT on it and use it to turn. Perhaps do This very first if room allows??
Else you might need to twist its head OFF, remove manifold to get a good grip on it.
Hopefully bolt will not break off in heads, ifs it does you still can put a nut over the stud, Tack weld it on and 99.9% change Then she will remove by thread.

There are vid on YT guys doing the weld on nut bolt removal you van watch to get idea from.

User avatar

Stuka
Site Admin
Posts: 10524
Joined: Thu May 12, 2011 5:53 pm
Location: Sonora, CA
Contact:

Re: Stripped Intake Manifold bolt - HELP

Post by Stuka » Mon Jun 07, 2021 2:12 pm

There are a few solutions. The bolt off sockets and welding a nut on mentioned above are both good ones.

As a last resort, you cut the head of the bolt off so that you can get the intake off. Once the intake is off, there should be enough sticking out of the head to get vice grips on it or a bolt off socket and break it loose (if still needed once tension is gone) and remove it.

I would avoid trying to break the head off though.
2017 JKU Rubicon Lifted and stuff
Pevious Jeeps: 1981 J10, 1975 Cherokee, 2008 JK, 2005 KJ, 1989 XJ


letank
Posts: 3406
Joined: Wed Oct 03, 2012 9:16 pm
Location: SF bay area

Re: Stripped Intake Manifold bolt - HELP

Post by letank » Mon Jun 07, 2021 4:59 pm

the space is so tight that if you cut off the bolt head, the leftover stud may prevent you from lifting up the manifold... upon reassembly aligning all holes is almost a puzzle...

Removing the hood is the best way to tackle the intake manifold removal and installation
Michel
74 wag (349 Kmiles... parked, next step is a rust free body)
85 Gwag (227 Kmiles... the running test lab)
See Engine bits , Fuel and brake lines, Body work, Trany and TC

User avatar

Stuka
Site Admin
Posts: 10524
Joined: Thu May 12, 2011 5:53 pm
Location: Sonora, CA
Contact:

Re: Stripped Intake Manifold bolt - HELP

Post by Stuka » Mon Jun 07, 2021 8:10 pm

letank wrote:
Mon Jun 07, 2021 4:59 pm
the space is so tight that if you cut off the bolt head, the leftover stud may prevent you from lifting up the manifold... upon reassembly aligning all holes is almost a puzzle...

Removing the hood is the best way to tackle the intake manifold removal and installation
Its tough to bolt down because the bolts on both sides are at angles. So you have to squish it down evenly to get the bolts started. But with all the other bolts remove, it doesn't have to come straight up, he could lift the passenger side first and it will come right off.
2017 JKU Rubicon Lifted and stuff
Pevious Jeeps: 1981 J10, 1975 Cherokee, 2008 JK, 2005 KJ, 1989 XJ


marc
Posts: 103
Joined: Tue Aug 11, 2020 8:24 am

Re: Stripped Intake Manifold bolt - HELP

Post by marc » Mon Jun 07, 2021 10:16 pm

friend told me about this but I have not yet tried it. After torching thr manifold, try melting paraffin into the threads while they are hot. Looking to try it on seized exhaust check valves.

User avatar

tgreese
Posts: 4732
Joined: Fri Jun 08, 2012 6:31 am
Location: Medford MA USA

Re: Stripped Intake Manifold bolt - HELP

Post by tgreese » Tue Jun 08, 2021 7:03 am

The first thing I'd try is a 6-point box end or combination wrench, and then drive it onto the bolt head with a hammer. It's got to be a 6-point type. A 12-point box, open-end or adjustable (especially!) will only bite the corners of the bolt head and they will round off. The 6-point wrench will push on the flats of the hex as well as the points. Once the wrench is fully seated on the bolt, hit the extended end of the wrench with a hammer to loosen. A hefty pipe cheater may also help.

A 14 mm wrench is slightly smaller than a 9/16" bolt (9/16" = 14.2875 mm). I would also try to drive a 6-point 14 mm box end wrench onto the bolt. Use a drift and a proper hammer (say a 16 oz ball peen or engineers hammer). Wear safety glasses. Then do the hammer and cheater routine.
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
Dual Everything: '15 FCA Jeep Cherokee KL Trailhawk, ECO Green
Blockchain the vote.


j10builder
Posts: 59
Joined: Tue Mar 12, 2019 5:28 pm

Re: Stripped Intake Manifold bolt - HELP

Post by j10builder » Tue Jun 08, 2021 9:22 am

All are good ideas. I want to take a minute to say how great it is that there is all this knowledge willing to help at a moments notice when someone hits a wall with a challenge. If only there was an internet when I was younger! Knowledge is hard gained and the fact that there is so much experience willing to be selflessly shared is exactly why forums like this are truly special and amazing. Patience, PB Blaster and an occasional whack with a good hammer to free that stuff up. Don't get in too much of a rush (that's my contribution). Good excuse to buy a new tool too.


marc
Posts: 103
Joined: Tue Aug 11, 2020 8:24 am

Re: Stripped Intake Manifold bolt - HELP

Post by marc » Tue Jun 08, 2021 10:43 am

Something that I have had success with is wrapping a small piece of cloth or other absorbent material tightly around the base of the bolt and saturating it with PB Blaster. Over the course of several days repeatedly lightly tap the bolt and resaturate the cloth. Tapping is to set up vibrations in the bolt to aid the PB Blaster not to knock the bolt loose. It might take several days but I have moved some stubborn seizures that way. The cloth acts as resasvoir for the PBB.


letank
Posts: 3406
Joined: Wed Oct 03, 2012 9:16 pm
Location: SF bay area

Re: Stripped Intake Manifold bolt - HELP

Post by letank » Tue Jun 08, 2021 1:41 pm

tgreese wrote:
Tue Jun 08, 2021 7:03 am
A 14 mm wrench is slightly smaller than a 9/16" bolt (9/16" = 14.2875 mm). I would also try to drive a 6-point 14 mm box end wrench onto the bolt. Use a drift and a proper hammer (say a 16 oz ball peen or engineers hammer). Wear safety glasses. Then do the hammer and cheater routine.
Very useful hint, another size: 5/16" and 8mm is good alternate, especially as some of the overseas manufacturing specs are sometimes a bit off
Michel
74 wag (349 Kmiles... parked, next step is a rust free body)
85 Gwag (227 Kmiles... the running test lab)
See Engine bits , Fuel and brake lines, Body work, Trany and TC

User avatar

1978J10REDWHITE
Posts: 130
Joined: Fri Nov 20, 2020 7:25 pm

Re: Stripped Intake Manifold bolt - HELP

Post by 1978J10REDWHITE » Sun Jun 13, 2021 6:49 pm

Status update??


will e
Posts: 4457
Joined: Sat Aug 18, 2012 8:21 am

Re: Stripped Intake Manifold bolt - HELP

Post by will e » Mon Jun 14, 2021 12:49 pm

I would install and torque down the other intake manifold bolts too. This might give help ease up on your bolt just a bit. It certainly can't hurt to do so.
81 Waggy 'WILL E' Retired
82 Cherokee WT - SOA/SF/high steer/Alcan springs/agr box/Borgeson steering shaft/AMC 401/performer/holley TA/HEI/BeCool/727/ALTAS (2.0/2.72/5.44)/D60 Snofighter(Yukon Zip,hubs,stubs,4.56)/14 Bolt (FF,BF shave, Discs, ARB,Artec Truss)/MTR 37X12.5/Corbeau XRS Baja & 5 point retractable harness/Hella Aux lights/tuffy console/killer32 sliders/Evil Twin bumpers, rack and roll cage/WARN 8000/TT Fabworks steering brace/dual batts/custom TC skid plate/ARB fridge


threepiece
Posts: 205
Joined: Mon Apr 20, 2020 8:33 am

Re: Stripped Intake Manifold bolt - HELP

Post by threepiece » Thu Jun 17, 2021 6:38 am

Yes, some good suggestion here but I didn’t see where someone indicated using s small hammer.

Too often the belief is bigger is better but this is not the case when loosening screws. When impacting a screw using a punch, chisel or wrench a light hammer usually works better. This because much of the energy from a relatively slow moving heavy hammer is absorbed in the surrounding structure. A lighter hammer moving at higher speed can have nearly as much or more energy. Because of the difference in mass, more energy will be transmitted into the screw where it is needed.

The principal is the same as forging metal with hammer and anvil. A heavier anvil is alway better. Try hammering on a 10 pound anvil with a 16 pound hammer.
I used to name my FSJ’s after their previous owners, I realized I had too many when I had five named Rick.


Topic author
JeepNorris
Posts: 16
Joined: Wed Dec 02, 2020 7:22 am

Re: Stripped Intake Manifold bolt - HELP

Post by JeepNorris » Thu Jul 08, 2021 12:13 pm

Sorry for the delayed update on this thread as I was called back to Texas for a family emergency. I was able to get the bolt off by soaking it with PB blaster and then driving a flat head screw driver into one side of the bolt head at a 45 degree angle, creating a slot in the head. Then rotated the same screwdriver so when tapped it would back the bolt out (counter clockwise).

Thanks again for all the help!

User avatar

Stuka
Site Admin
Posts: 10524
Joined: Thu May 12, 2011 5:53 pm
Location: Sonora, CA
Contact:

Re: Stripped Intake Manifold bolt - HELP

Post by Stuka » Thu Jul 08, 2021 12:29 pm

Glad you got it out!
2017 JKU Rubicon Lifted and stuff
Pevious Jeeps: 1981 J10, 1975 Cherokee, 2008 JK, 2005 KJ, 1989 XJ

Post Reply

Who is online

Users browsing this forum: No registered users and 4 guests