Home » Public Forums » GMCnet » Broken exhaust manifold bolt - final verdict
| Broken exhaust manifold bolt - final verdict [message #149382] |
Fri, 11 November 2011 11:57  |
Galen
Messages: 146
Registered: November 2011
Location: New Virginia, IA
Karma: 0
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Senior Member |
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New member and owner here. '78 Palm Beach, 403. Been lurking the last couple weeks finding lots of great info here and the other websites, so a big thanks to those who maintain this and participate.
My exhaust manifold gaskets, or what was left of them, were leaking, as were the donuts, so I started pulling them. 9 of 10 bolts came right out. I read all the good advice on here, applied penetrating oil over a few days, and they all loosened right up. Right up until the last one, that is. With very little force, it snapped right of, probably because after the 7th or 8th, I thought "wow, this is going pretty good!".
The one that broke was the bolt on the driver's side. Only the head broke off, flush with the top of the manifold.
My question is I have read a couple posts on here that have advised the middle bolt may not even be needed. I have the Remflex gaskets.
Do I even mess with trying to get the broken bolt out or roll the dice?
I don't have a welder. I really don't want to pull the head.
Thanks in advance.
Galen Briggs
New Virginia, Iowa
1978 Palm Beach
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| Re: Broken exhaust manifold bolt - final verdict [message #149383 is a reply to message #149382] |
Fri, 11 November 2011 12:20  |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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Galen,
Welcome to the GMCnet and the forum.
While many say the upper middle bolt is unnecessary -- I prefer to have it in place, but I only torque it to 75% of what I torque the others.
Now that you have the manifold off, you should be able to apply penetrating fluid more directly to the thread/hole. Let it soak and then try a large size vice-grip plier.
Dennis
| Galen wrote on Fri, 11 November 2011 11:57 |
New member and owner here. '78 Palm Beach, 403. Been lurking the last couple weeks finding lots of great info here and the other websites, so a big thanks to those who maintain this and participate.
My exhaust manifold gaskets, or what was left of them, were leaking, as were the donuts, so I started pulling them. 9 of 10 bolts came right out. I read all the good advice on here, applied penetrating oil over a few days, and they all loosened right up. Right up until the last one, that is. With very little force, it snapped right of, probably because after the 7th or 8th, I thought "wow, this is going pretty good!".
The one that broke was the bolt on the driver's side. Only the head broke off, flush with the top of the manifold.
My question is I have read a couple posts on here that have advised the middle bolt may not even be needed. I have the Remflex gaskets.
Do I even mess with trying to get the broken bolt out or roll the dice?
I don't have a welder. I really don't want to pull the head.
Thanks in advance.
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Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: Broken exhaust manifold bolt - final verdict [message #149402 is a reply to message #149382] |
Fri, 11 November 2011 18:00 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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| Galen wrote on Fri, 11 November 2011 12:57 |
New member and owner here. '78 Palm Beach, 403. Been lurking the last couple weeks finding lots of great info here and the other websites, so a big thanks to those who maintain this and participate.
My exhaust manifold gaskets, or what was left of them, were leaking, as were the donuts, so I started pulling them. 9 of 10 bolts came right out. I read all the good advice on here, applied penetrating oil over a few days, and they all loosened right up. Right up until the last one, that is. With very little force, it snapped right of, probably because after the 7th or 8th, I thought "wow, this is going pretty good!".
The one that broke was the bolt on the driver's side. Only the head broke off, flush with the top of the manifold.
My question is I have read a couple posts on here that have advised the middle bolt may not even be needed. I have the Remflex gaskets.
Do I even mess with trying to get the broken bolt out or roll the dice?
I don't have a welder. I really don't want to pull the head.
Thanks in advance.
|
Gelen,
Welcome to the family, group, cult, asylum.....
For a fastener to fail under the head, it pretty much had to be bad from the get-go. If you can slide the manifold off it - you may have to loosen up the leaking donut bolts. In fact, if they are leaking, you might just as well take them apart now - too.
When the manifold is out of the way, you have a better chance. Vice grips and penetrant is the best start. Do you have a "belly board". If no cut a piece of something like 1*6 to span the engine room door so you can be sort of comfortable. An even mix of acetone and AFT or PS fluid has been found be the best penetrating oil.
If that doesn't work come back here for more ideas.
Be sure to use a good anti-sieze on all the fasteners during your re-assembly. (Work on it like you will be the next one to work one it.)
If you have been here long at all, you will know that these coaches are not just a house vehicle. They have become very much a part of the owner/family's life. I can compare it to the place that the boat fits in a waterman's life. So, I offer all new owners a version of what I would offer to any new owner or vessel.
My the Good Lord bless this coach and all those that set forth within her.
Welcome Gelen (and family?)
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: Broken exhaust manifold bolt - final verdict [message #149412 is a reply to message #149402] |
Fri, 11 November 2011 21:29 |
Galen
Messages: 146
Registered: November 2011
Location: New Virginia, IA
Karma: 0
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Senior Member |
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Dennis and Matt,
Thanks for the responses. ATF and Acetone is good stuff and what I've been using. All of the bolts that came out of this side had anti seize on them and came right out, which is what surprised me so much when this one broke so easy, with way less force than any grade of bolt would break at. But from what I've read there's a lot of heat there, and I'm certainly not first guy to break the head off this center bolt.
I have the manifolds pulled - I was replacing the donuts anyway, so there's a couple more broken on that end to deal with. I've hit it with the ATF mix a few times today. Might try to get a torch on it tomorrow. I have had luck in the past with even a butane torch followed by a shot of butane on the hot bolt to cool it quickly. Just hate to mangle it, but I guess I'll give it a go. Might have to invest in a new pair vise grips.
In the mean time, I'm trying to be patient.
Thanks for the welcome and blessing Matt.
Galen Briggs
New Virginia, Iowa
1978 Palm Beach
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| Re: Broken exhaust manifold bolt - final verdict [message #149419 is a reply to message #149412] |
Fri, 11 November 2011 23:24 |
bwevers
Messages: 597
Registered: October 2010
Location: San Jose
Karma: 5
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Senior Member |
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Galen,
Sorry about the broken bolt. I had a couple on
my heads. You can probably get by without the
top center bolt. It's recommended not to tighted
the center bolt too much (only snug).
Thick Copper gaskets helped silence my exhaust leaks.
Like this one: http://www.gmcmhphotos.com/photos/showphoto.php?photo=3226&cat=3305
I finally drilled out the broken bolts and put in
thread inserts when I did a valve job. It's much
easier to work on the stuck bolts with the head off.
Good Luck,
Bill
Bill Wevers GMC49ers, GMC Western States
1975 Glenbrook - Manny Powerdrive, OneTon
455 F Block, G heads
San Jose
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| Re: Broken exhaust manifold bolt - final verdict [message #149427 is a reply to message #149419] |
Sat, 12 November 2011 01:48 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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ATF/Acetone mix or Kroil is your best penetrating oil. Heat with propane (not acetylene or mapp) and shock cool with Kroil several times, then let soak over night. Eventually you will get it loose. I have also sometimes drilled a small hole in the center of the bolt so I could get more cold Kroil in there for shock cooling. Just be patient. You might 3 or 4 days doing this but it will eventually loosen up.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Broken exhaust manifold bolt - final verdict [message #149436 is a reply to message #149412] |
Sat, 12 November 2011 07:25 |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Senior Member |
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Sir: I have good luck using a small pipe wrench. More contact area than the vice grips.
| Galen wrote on Fri, 11 November 2011 22:29 |
Dennis and Matt,
Thanks for the responses. ATF and Acetone is good stuff and what I've been using. All of the bolts that came out of this side had anti seize on them and came right out, which is what surprised me so much when this one broke so easy, with way less force than any grade of bolt would break at. But from what I've read there's a lot of heat there, and I'm certainly not first guy to break the head off this center bolt.
I have the manifolds pulled - I was replacing the donuts anyway, so there's a couple more broken on that end to deal with. I've hit it with the ATF mix a few times today. Might try to get a torch on it tomorrow. I have had luck in the past with even a butane torch followed by a shot of butane on the hot bolt to cool it quickly. Just hate to mangle it, but I guess I'll give it a go. Might have to invest in a new pair vise grips.
In the mean time, I'm trying to be patient.
Thanks for the welcome and blessing Matt.
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C. Boyd
76 Crestmont
East Tennessee
[Updated on: Sat, 12 November 2011 07:26] Report message to a moderator |
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| Re: [GMCnet] Broken exhaust manifold bolt - final verdict [message #149455 is a reply to message #149436] |
Sat, 12 November 2011 11:49 |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
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Senior Member |
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Some of us older guys persist in calling that a "Stilson" wrench!
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~~ ~ D C "Mac" Macdonald ~ ~~
~ ~ Amateur Radio - K2GKK ~ ~
~ ~ USAF and FAA, Retired ~ ~
~ ~ ~ Oklahoma City, OK ~ ~ ~
~~ ~ ~ "The Money Pit" ~ ~ ~~
~ ~ ~ ex-Palm Beach, 76 ~ ~ ~
~ www.gmcmhphotos.com/okclb ~
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
> To: gmclist@temp.gmcnet.org
> From: covered-wagon@comcast.net
> Date: Sat, 12 Nov 2011 07:25:33 -0600
> Subject: Re: [GMCnet] Broken exhaust manifold bolt - final verdict
>
>
>
> Galen wrote on Fri, 11 November 2011 22:29
> > Dennis and Matt,
> >
> > Sir: I have good luck using a small pipe wrench. More contact area than the vice grips.
> >
> >
> >
> > Thanks for the responses. ATF and Acetone is good stuff and what I've been using. All of the bolts that came out of this side had anti seize on them and came right out, which is what surprised me so much when this one broke so easy, with way less force than any grade of bolt would break at. But from what I've read there's a lot of heat there, and I'm certainly not first guy to break the head off this center bolt.
> >
> > I have the manifolds pulled - I was replacing the donuts anyway, so there's a couple more broken on that end to deal with. I've hit it with the ATF mix a few times today. Might try to get a torch on it tomorrow. I have had luck in the past with even a butane torch followed by a shot of butane on the hot bolt to cool it quickly. Just hate to mangle it, but I guess I'll give it a go. Might have to invest in a new pair vise grips.
> >
> > In the mean time, I'm trying to be patient.
> >
> > Thanks for the welcome and blessing Matt.
>
>
> --
> C. Boyd
> 76 Crestmont by Midas
> East Tennessee
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| Re: Broken exhaust manifold bolt - final verdict [message #149458 is a reply to message #149382] |
Sat, 12 November 2011 12:05 |
Ernest Dankert
Messages: 133
Registered: May 2007
Location: Ogden, New York
Karma: 1
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Assuming the manifold is off, apply your penetrating oil of choice and tap the top of the bolt. As you tap you should see the oil disappear in the bolt head interface. Apply more oil and taps. Repeat. Apply a locking pliers (vise-grip) and wiggle.
The middle bolt is prone to metal crystallization.
I used copper based neverseize inasmuch as I have the zinc based fail in oil burner service.
1977 Eleganza II
Ogden NY
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| Re: [GMCnet] Broken exhaust manifold bolt - final verdict [message #149515 is a reply to message #149458] |
Sat, 12 November 2011 20:56 |
berndh
Messages: 33
Registered: January 2007
Karma: 0
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Member |
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I just finished my broken exhaust manifold nightmare. Used plenty of Kroil,
multiple applications over time. Nine came out without a hitch but the
front one on the passenger side broke off at the head. Tried torch, tried
vice grips, nothing wouldn't budge.
Used Dremmel to cut of bolt flush with block. Drilled hole in bolt trying
not to screw up thread. Tried to get the rest out using an easy out. The
easy out snapped off, so got a ceramic bit to drill out the "easy out" Tried
to clear out using tapping tool, snapped of tapping tool, drippled out
tapping tool and drilled a bigger hole, got lucky and don't know how I kept
from messing up the thread. I was using a hand drill and trying to keep it
at the right angle to drill out the bolt.
78 Royale
Denver CO
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Ernest Dankert
Sent: Saturday, November 12, 2011 11:05 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Broken exhaust manifold bolt - final verdict
Assuming the manifold is off, apply your penetrating oil of choice and tap
the top of the bolt. As you tap you should see the oil disappear in the bolt
head interface. Apply more oil and taps. Repeat. Apply a locking pliers
(vise-grip) and wiggle.
The middle bolt is prone to metal crystallization.
I used copper based neverseize inasmuch as I have the zinc based fail in oil
burner service.
--
1977 Eleganza II
Fairport NY
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| Re: [GMCnet] Broken exhaust manifold bolt - final verdict [message #149517 is a reply to message #149515] |
Sat, 12 November 2011 21:02 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Senior Member |
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Did you do all of that in the dark and rain? That's about all I could think of to make that story worse. At least you got it out!
Sully
77 royale
Sent from my Verizon Wireless BlackBerry
-----Original Message-----
From: "Bernd Hoffmann" <berndh@peoplepc.com>
Sender: gmclist-bounces@temp.gmcnet.org
Date: Sat, 12 Nov 2011 19:56:57
To: <gmclist@temp.gmcnet.org>
Reply-To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Broken exhaust manifold bolt - final verdict
I just finished my broken exhaust manifold nightmare. Used plenty of Kroil,
multiple applications over time. Nine came out without a hitch but the
front one on the passenger side broke off at the head. Tried torch, tried
vice grips, nothing wouldn't budge.
Used Dremmel to cut of bolt flush with block. Drilled hole in bolt trying
not to screw up thread. Tried to get the rest out using an easy out. The
easy out snapped off, so got a ceramic bit to drill out the "easy out" Tried
to clear out using tapping tool, snapped of tapping tool, drippled out
tapping tool and drilled a bigger hole, got lucky and don't know how I kept
from messing up the thread. I was using a hand drill and trying to keep it
at the right angle to drill out the bolt.
78 Royale
Denver CO
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Ernest Dankert
Sent: Saturday, November 12, 2011 11:05 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Broken exhaust manifold bolt - final verdict
Assuming the manifold is off, apply your penetrating oil of choice and tap
the top of the bolt. As you tap you should see the oil disappear in the bolt
head interface. Apply more oil and taps. Repeat. Apply a locking pliers
(vise-grip) and wiggle.
The middle bolt is prone to metal crystallization.
I used copper based neverseize inasmuch as I have the zinc based fail in oil
burner service.
--
1977 Eleganza II
Fairport NY
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The message was checked by ESET NOD32 Antivirus.
http://www.eset.com
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The message was checked by ESET NOD32 Antivirus.
http://www.eset.com
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: [GMCnet] Broken exhaust manifold bolt - final verdict [message #149520 is a reply to message #149515] |
Sat, 12 November 2011 21:29 |
jtblank
Messages: 237
Registered: June 2007
Location: Tulare, CA
Karma: 1
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Senior Member |
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Man that sounds like a real nightmare, been there and done that. Just when you think it can't get any worse it does. I've found that not being in a rush and getting away from the problem and working on something easier clears your head and frustration allowing a fresh start.
John Blankenship
'76 Palm Beach
Tulare, CA
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| Re: [GMCnet] Broken exhaust manifold bolt - final verdict [message #149523 is a reply to message #149517] |
Sat, 12 November 2011 21:31 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Well,
I've heard one similar tale with a further kink: When Dixielander Dan
Hudson, now deceased, installed his Cad500, he broke a tap off in one of
the exhaust manifold bolts. While using a center punch to try to back
the tap our, he felt something hit him in the face. After he finally got
the tap out and the manifold installed, he installed the spark plugs and
cranked the engine.
An awful racket ensued. Finally, after much deliberation, head scratching,
and remembering, he bought a bore scope. Inside the cylinder beside the
troublesome bolt hole, he found the piece of tap which had hit him in the
face before bouncing into the spark plug hole.
He got lucky then -- the particle apparently never touched the cylinder
wall and he was able to fish it out.
Talk about bad luck! And erudite troubleshooting!
Ken H.
On Sat, Nov 12, 2011 at 10:02 PM, <sgltrac@gmail.com> wrote:
> Did you do all of that in the dark and rain? That's about all I could
> think of to make that story worse. At least you got it out!
>
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Broken exhaust manifold bolt - final verdict [message #149525 is a reply to message #149523] |
Sat, 12 November 2011 22:16 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Senior Member |
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Similar experience although only the hit in the face part. I was attempting to peen over a street bike chain master link with a hammer and punch when part of it flew off and hit me in the forehead. It hurt but diddnt bleed. Later after showering I had a bump where the fragment hit me. I investigated in the mirror after showering and saw a small crescent shaped cut in the center of the swollen spot. I squeezed it like a zit and a large crescent shaped piece of the master link pin fell out and onto my finger. DON'T FORGET THE SAFETY GLASSES!
Sully
77 royale
Sent from my Verizon Wireless BlackBerry
-----Original Message-----
From: Ken Henderson <hend4800@bellsouth.net>
Sender: gmclist-bounces@temp.gmcnet.org
Date: Sat, 12 Nov 2011 22:31:24
To: <gmclist@temp.gmcnet.org>
Reply-To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Broken exhaust manifold bolt - final verdict
Well,
I've heard one similar tale with a further kink: When Dixielander Dan
Hudson, now deceased, installed his Cad500, he broke a tap off in one of
the exhaust manifold bolts. While using a center punch to try to back
the tap our, he felt something hit him in the face. After he finally got
the tap out and the manifold installed, he installed the spark plugs and
cranked the engine.
An awful racket ensued. Finally, after much deliberation, head scratching,
and remembering, he bought a bore scope. Inside the cylinder beside the
troublesome bolt hole, he found the piece of tap which had hit him in the
face before bouncing into the spark plug hole.
He got lucky then -- the particle apparently never touched the cylinder
wall and he was able to fish it out.
Talk about bad luck! And erudite troubleshooting!
Ken H.
On Sat, Nov 12, 2011 at 10:02 PM, <sgltrac@gmail.com> wrote:
> Did you do all of that in the dark and rain? That's about all I could
> think of to make that story worse. At least you got it out!
>
>
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: [GMCnet] Broken exhaust manifold bolt - final verdict [message #149529 is a reply to message #149525] |
Sat, 12 November 2011 22:38 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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It is always amazing to me how much trouble one more pull on the wrench can
get you into. You went from having a extended bolt to having to deal with
the hardest tool steel known to man with one tug on the wrench. Been there,
done that enough times that I have learned patience in the face of every
urge to pull on that wrench just once more. Murphy just sits up there in
the co pilots seat, laughing his behind off. What more likely than not
happened was that a longer bolt was substituted for an original one in that
center hole, and when it was tightened, it bottomed in the hole at about
the same time the head of the bolt made contact with the manifold. Further
turn on the wrench shears the bolt at one of two places. The underside of
the bolt head, which happened to you, or at the juncture of the threads and
the unthreaded portion of the bolt. To cure this problem, a hole smaller
than the minor diameter of the bolt should be drilled completely through
the bolt. That will relieve the bottoming load and will allow the
penetrating fluid of your choice to attack the problem from the bottom.
Jim Hupy
Salem, OR
78 GMC Royale 403
On Sat, Nov 12, 2011 at 8:16 PM, <sgltrac@gmail.com> wrote:
> Similar experience although only the hit in the face part. I was
> attempting to peen over a street bike chain master link with a hammer and
> punch when part of it flew off and hit me in the forehead. It hurt but
> diddnt bleed. Later after showering I had a bump where the fragment hit me.
> I investigated in the mirror after showering and saw a small crescent
> shaped cut in the center of the swollen spot. I squeezed it like a zit and
> a large crescent shaped piece of the master link pin fell out and onto my
> finger. DON'T FORGET THE SAFETY GLASSES!
>
> Sully
> 77 royale
> Sent from my Verizon Wireless BlackBerry
>
> -----Original Message-----
> From: Ken Henderson <hend4800@bellsouth.net>
> Sender: gmclist-bounces@temp.gmcnet.org
> Date: Sat, 12 Nov 2011 22:31:24
> To: <gmclist@temp.gmcnet.org>
> Reply-To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] Broken exhaust manifold bolt - final verdict
>
> Well,
>
> I've heard one similar tale with a further kink: When Dixielander Dan
> Hudson, now deceased, installed his Cad500, he broke a tap off in one of
> the exhaust manifold bolts. While using a center punch to try to back
> the tap our, he felt something hit him in the face. After he finally got
> the tap out and the manifold installed, he installed the spark plugs and
> cranked the engine.
>
> An awful racket ensued. Finally, after much deliberation, head scratching,
> and remembering, he bought a bore scope. Inside the cylinder beside the
> troublesome bolt hole, he found the piece of tap which had hit him in the
> face before bouncing into the spark plug hole.
>
> He got lucky then -- the particle apparently never touched the cylinder
> wall and he was able to fish it out.
>
> Talk about bad luck! And erudite troubleshooting!
>
> Ken H.
>
>
>
> On Sat, Nov 12, 2011 at 10:02 PM, <sgltrac@gmail.com> wrote:
>
> > Did you do all of that in the dark and rain? That's about all I could
> > think of to make that story worse. At least you got it out!
> >
> >
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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> GMCnet mailing list
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>
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| Re: [GMCnet] Broken exhaust manifold bolt - final verdict [message #149755 is a reply to message #149382] |
Wed, 16 November 2011 00:45 |
Richard Denney
Messages: 920
Registered: April 2010
Karma: 9
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Senior Member |
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On Fri, Nov 11, 2011 at 12:57 PM, Galen Briggs <gpbriggs@iowatelecom.net>wrote:
> The one that broke was the bolt on the driver's side. Only the head broke
> off, flush with the top of the manifold.
>
>
You'll have to be pretty lucky to get a good, long-lasting seal without
that top bolt, even with Remflex gaskets. Get a left-handed drill bit the
same size as the root of the threads and drill it out, if you can't get it
loose with Vice-Grips after pulling the manifold.
After drilling it out at the thread root size, retap it with a 3/8-16 tap.
What the left-handed tap left in the hole, the tap removed. I was expecting
no threads to be left, figuring the tap would not align with the old
threads, but I was able to tighten the center bolt appropriately after
tapping.
As you can see in the picture below, mine broke off flush with the head
surface.
http://www.gmcmhphotos.com/photos/showphoto.php?photo=5891&cat=3556
I bought an East-Out kit that included left-handed bits. These bits run in
the reverse direction of your drill.
Rick "for whom this was the first GMC project--and the first (but not last)
setback" Denney
--
'73 230 "Jaws"
Northern Virginia
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| Re: [GMCnet] Broken exhaust manifold bolt - final verdict [message #149788 is a reply to message #149412] |
Wed, 16 November 2011 11:33 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Galen.
Which bolt broke ?
All the bolts except the one on top center comes through , so you can
treat it from both sides.
When it does not want to back out, use a center punch and hit it hard
square on to break the grip.
Keep in mind that sometimes you'll need to twist the opposite way just
to break it loose.
On Fri, Nov 11, 2011 at 7:29 PM, Galen Briggs <gpbriggs@iowatelecom.net> wrote:
>
>
> Dennis and Matt,
>
> Thanks for the responses. ATF and Acetone is good stuff and what I've been using. All of the bolts that came out of this side had anti seize on them and came right out, which is what surprised me so much when this one broke so easy, with way less force than any grade of bolt would break at. But from what I've read there's a lot of heat there, and I'm certainly not first guy to break the head off this center bolt.
>
> I have the manifolds pulled - I was replacing the donuts anyway, so there's a couple more broken on that end to deal with. I've hit it with the ATF mix a few times today. Might try to get a torch on it tomorrow. I have had luck in the past with even a butane torch followed by a shot of butane on the hot bolt to cool it quickly. Just hate to mangle it, but I guess I'll give it a go. Might have to invest in a new pair vise grips.
>
> In the mean time, I'm trying to be patient.
>
> Thanks for the welcome and blessing Matt.
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--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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