Exhaust Manifolds

R

robert teed

New member
Feb 15, 1998
170
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I'm trying to get the Exhaust Manifolds off
the 74' 455 engine. What a Pain! Broke the
head off two bolts, Got Two out Sucessfully,
Six Left. All with striped heads. Im planning
to use a cutting torch to get the rest. Will
the post left after cutting the heads off be
very hard to remove????? Has anyone broke one
off at the block???? Thats My main Worry!
Thanks,
Rob Teed
74' Painted Desert
Lansing,Mi
 
Maybe when you put it back to gether, Anti-seiz might be recommended.
Check out the Copper Gasket from Mondellos. Chuck

> I'm trying to get the Exhaust Manifolds off
> the 74' 455 engine. What a Pain! Broke the
> head off two bolts, Got Two out Sucessfully,
> Six Left. All with striped heads. Im planning
> to use a cutting torch to get the rest. Will
> the post left after cutting the heads off be
> very hard to remove????? Has anyone broke one
> off at the block???? Thats My main Worry!
> Thanks,
> Rob Teed
> 74' Painted Desert
> Lansing,Mi
 
Good Idea Chuck. As long as they hold tight. Im
lucky in that the rest of the exhaust system is
in " Like New " condition. The MH sat for over
ten years unused.
See Ya,
Rob Teed
74' Painted Desert " Great Pumkin "
Lansing,Mi

> -----Original Message-----
> From: owner-gmcmotorhome
> [mailto:owner-gmcmotorhome]On Behalf Of Chuck Will
> Sent: Thursday, October 22, 1998 1:19 AM
> To: gmcmotorhome
> Subject: Re: GMC: Exhaust Manifolds
>
>
> Maybe when you put it back to gether, Anti-seiz might be recommended.
> Check out the Copper Gasket from Mondellos. Chuck
>

>
> > I'm trying to get the Exhaust Manifolds off
> > the 74' 455 engine. What a Pain! Broke the
> > head off two bolts, Got Two out Sucessfully,
> > Six Left. All with striped heads. Im planning
> > to use a cutting torch to get the rest. Will
> > the post left after cutting the heads off be
> > very hard to remove????? Has anyone broke one
> > off at the block???? Thats My main Worry!
> > Thanks,
> > Rob Teed
> > 74' Painted Desert
> > Lansing,Mi
>
>
>
>
 
You need to soack them a lot with a penetrating oil before you try and
remove them.

>I'm trying to get the Exhaust Manifolds off
> the 74' 455 engine. What a Pain! Broke the
> head off two bolts, Got Two out Sucessfully,
> Six Left. All with striped heads. Im planning
> to use a cutting torch to get the rest. Will
> the post left after cutting the heads off be
> very hard to remove????? Has anyone broke one
> off at the block???? Thats My main Worry!
>Thanks,
> Rob Teed
> 74' Painted Desert
> Lansing,Mi
>
>
 
OK. Should I heat them also. I Have a Mapp/Oxy
set I got from Home Depot. Gas only last about
10 min when cutting. A little longer when just
heating.
Rob Teed

> -----Original Message-----
> From: owner-gmcmotorhome
> [mailto:owner-gmcmotorhome]On Behalf Of Thomas G.
> Warner
> Sent: Thursday, October 22, 1998 9:04 AM
> To: gmcmotorhome
> Subject: Re:GMC: Exhaust Manifolds
>
>
> You need to soack them a lot with a penetrating oil before you try and
> remove them.
>

> >I'm trying to get the Exhaust Manifolds off
> > the 74' 455 engine. What a Pain! Broke the
> > head off two bolts, Got Two out Sucessfully,
> > Six Left. All with striped heads. Im planning
> > to use a cutting torch to get the rest. Will
> > the post left after cutting the heads off be
> > very hard to remove????? Has anyone broke one
> > off at the block???? Thats My main Worry!
> >Thanks,
> > Rob Teed
> > 74' Painted Desert
> > Lansing,Mi
> >
> >
>
>
 
I suggest penetrating oil, then heating, etc as it is much easier than
getting them out after you break them.

You might want to try the following on your broken exhaust studs:

1. If any of the stud is sticking above the head put a nut on top of
the stud and weld the nut to the stud.
Keep the nut slightly off the head so there is a little room
between them.

2. Now take a heavy hammer and give the stud a couple of hard hits
straight on like you are trying to drive it
through the head. This helps loosen the threads. Finding room to
swing the hammer may be a problem.

Good luck

Don Miller
Shenandoah Valley of Virginia

>Date: Thu, 22 Oct 1998 09:21:16 -0400
>From: "robteed"
>Subject: RE: GMC: Exhaust Manifolds
>
>OK. Should I heat them also. I Have a Mapp/Oxy
> set I got from Home Depot. Gas only last about
> 10 min when cutting. A little longer when just
> heating.
> Rob Teed
>
>> -----Original Message-----
>> From: owner-gmcmotorhome
>> [mailto:owner-gmcmotorhome]On Behalf Of Thomas G.
>> Warner
>> Sent: Thursday, October 22, 1998 9:04 AM
>> To: gmcmotorhome
>> Subject: Re:GMC: Exhaust Manifolds
>>
>>
>> You need to soack them a lot with a penetrating oil before you try and
>> remove them.
>>

>> >I'm trying to get the Exhaust Manifolds off
>> > the 74' 455 engine. What a Pain! Broke the
>> > head off two bolts, Got Two out Sucessfully,
>> > Six Left. All with striped heads. Im planning
>> > to use a cutting torch to get the rest. Will
>> > the post left after cutting the heads off be
>> > very hard to remove????? Has anyone broke one
>> > off at the block???? Thats My main Worry!
>> >Thanks,
>> > Rob Teed
>> > 74' Painted Desert
>> > Lansing,Mi
>> >
 
Hi Don,
Well all of the Bolts left are rounded, So resigned
to cutting them off:(
Will still try rapping on them with a hammer after
the Manifolds are off.
See Ya,
Rob

> -----Original Message-----
> From: owner-gmcmotorhome
> [mailto:owner-gmcmotorhome]On Behalf Of Donald W.
> Miller
> Sent: Thursday, October 22, 1998 11:13 AM
> To: gmcmotorhome
> Subject: Re: GMC: Exhaust Manifolds
>
>
> I suggest penetrating oil, then heating, etc as it is much easier than
> getting them out after you break them.
>
> You might want to try the following on your broken exhaust studs:
>
> 1. If any of the stud is sticking above the head put a nut on top of
> the stud and weld the nut to the stud.
> Keep the nut slightly off the head so there is a little room
> between them.
>
> 2. Now take a heavy hammer and give the stud a couple of hard hits
> straight on like you are trying to drive it
> through the head. This helps loosen the threads.
> Finding room to
> swing the hammer may be a problem.
>
>
> Good luck
>
> Don Miller
> Shenandoah Valley of Virginia
>
>
> >Date: Thu, 22 Oct 1998 09:21:16 -0400
> >From: "robteed"
> >Subject: RE: GMC: Exhaust Manifolds
> >
> >OK. Should I heat them also. I Have a Mapp/Oxy
> > set I got from Home Depot. Gas only last about
> > 10 min when cutting. A little longer when just
> > heating.
> > Rob Teed
> >
> >> -----Original Message-----
> >> From: owner-gmcmotorhome
> >> [mailto:owner-gmcmotorhome]On Behalf Of Thomas G.
> >> Warner
> >> Sent: Thursday, October 22, 1998 9:04 AM
> >> To: gmcmotorhome
> >> Subject: Re:GMC: Exhaust Manifolds
> >>
> >>
> >> You need to soack them a lot with a penetrating oil before you try and
> >> remove them.
> >>

> >> >I'm trying to get the Exhaust Manifolds off
> >> > the 74' 455 engine. What a Pain! Broke the
> >> > head off two bolts, Got Two out Sucessfully,
> >> > Six Left. All with striped heads. Im planning
> >> > to use a cutting torch to get the rest. Will
> >> > the post left after cutting the heads off be
> >> > very hard to remove????? Has anyone broke one
> >> > off at the block???? Thats My main Worry!
> >> >Thanks,
> >> > Rob Teed
> >> > 74' Painted Desert
> >> > Lansing,Mi
> >> >
>
>
>
>
 
Thanks Bob,
I'll try that. I never welded before but nows
the time to learn.
Rob

> -----Original Message-----
> From: owner-gmcmotorhome
> [mailto:owner-gmcmotorhome]On Behalf Of Robert Shimanek
> Sent: Thursday, October 22, 1998 7:05 PM
> To: gmcmotorhome
> Subject: Re:GMC: Exhaust Manifolds
>
>
> Rob:
> If you break one off at the block, first weld a small a washer to the
> bolt then weld a nut to the washer and bolt. The washer is for more area
> for the nut to hold onto. Use a small rod 3/32' 6013. After
> welding take
> a wrench and move the welded assmembly back and forth slightly until it
> starts to come out. The heat from welding will aid in removing
> the broken
> off bolt. Be careful that you don't weld the bolt to the block.
> I suggest
> you practice on a test piece of iron first. It'll take a little practice
> but will have results.
>
> Bob
> 77PB
>

> >I'm trying to get the Exhaust Manifolds off
> > the 74' 455 engine. What a Pain! Broke the
> > head off two bolts, Got Two out Sucessfully,
> > Six Left. All with striped heads. Im planning
> > to use a cutting torch to get the rest. Will
> > the post left after cutting the heads off be
> > very hard to remove????? Has anyone broke one
> > off at the block???? Thats My main Worry!
> >Thanks,
> > Rob Teed
> > 74' Painted Desert
> > Lansing,Mi
> >
> >
>
>
 
Rob:
If you break one off at the block, first weld a small a washer to the
bolt then weld a nut to the washer and bolt. The washer is for more area
for the nut to hold onto. Use a small rod 3/32' 6013. After welding take
a wrench and move the welded assmembly back and forth slightly until it
starts to come out. The heat from welding will aid in removing the broken
off bolt. Be careful that you don't weld the bolt to the block. I suggest
you practice on a test piece of iron first. It'll take a little practice
but will have results.

Bob
77PB


>I'm trying to get the Exhaust Manifolds off
> the 74' 455 engine. What a Pain! Broke the
> head off two bolts, Got Two out Sucessfully,
> Six Left. All with striped heads. Im planning
> to use a cutting torch to get the rest. Will
> the post left after cutting the heads off be
> very hard to remove????? Has anyone broke one
> off at the block???? Thats My main Worry!
>Thanks,
> Rob Teed
> 74' Painted Desert
> Lansing,Mi
>
>
 
OK. So far I havent Broken any down to the block.
I hope that it doesnt come to that. Did You drill
those bolts out while the engine is installed?
That has to be a $%&%$#@!
Rob Teed

> -----Original Message-----
> From: owner-gmcmotorhome
> [mailto:owner-gmcmotorhome]On Behalf Of QUECON
> Sent: Thursday, October 22, 1998 10:35 PM
> To: gmcmotorhome
> Subject: Re: GMC: Exhaust Manifolds
>
>
> I agree,manifold studs are a pain.I broke two off below the
> surface.The remedy
> was time consuming,but not that difficult.Check at your auto
> parts store for
> what they call heli-coils.It requires you drill out existing bolts,and re-
> thread to a larger size.The heli-coil is then installed with a
> tool supplied
> with the kit.When finished it will receive same size bolt that
> was required to
> start with.The kit will run about $25.00 plus extra coils if
> needed.May sound
> difficult,but with patience its the only remedy sometimes.Main
> concern is to
> keep centered when drilling,starting with smaller bits and working up.The
> center stud is concealed,the rest can be seen next to spark
> plugs.If more info
> is needed....mail back.Good luck....
>
 
> > Maybe when you put it back to gether, Anti-seiz might be recommended.
> > Check out the Copper Gasket from Mondellos. Chuck
> >

Rob,

I recently had to remove my left exhaust manifold. I got lots of
information and advise from
GMCnet and from the GMC Motorhome International Newsletters. It was pointed
out that the
center bolt is the one that will most likely break. This is because the
other four have a hole that exits
at the spark plug indent and can be lubed with penetrating oil. (Some
people have drilled a similar
hole into the center bolt hole.) Put the oil in and give it time to
penetrate, then heat the bolts and add
some more oil. This should work. I was lucky, all bolts came out without
breakage. Using the advise
from the newsletter, I had the manifold resurfaced, cleaned the mating
surface on the head with a
wire brush and emery cloth and reinstalled the manifold using "Permatex"
Ultra high temp RTV silicone copper gasket maker. I also used new grade 8
bolts with the old thick washers. I also used unflavored milk of magnesia
as an anti-sieze solution. I read that its been used for years in the
aircraft industry. So far it is working well. The RTV silicone copper
gasket maker is suppose to transfer heat better that the fibre gaskets.
good luck.
Skip Newhouse 75 Avion Hagerstown Maryland
 
Rick I got to disagree with you on the use of Permatex ultra copper gasket
High temp. It works even when the surfaces leak with anything else. It did
on mine.

>
>> Did You drill
>> those bolts out while the engine is installed?
>> That has to be a $%&%$#@!
>
>Rob,
> You got that right! It was over 2 years ago, but I get cramps in my wrists
>from the memory. I still have the drill bit that I had to cut in half to
>allow a straight shot at the worst ones. Used new bolts and copious anti-
>sieze on installation.
> BTW, the Permatex "copper" sealer doesn't work unless both surfaces are
>well-nigh perfect. Recommend the solid copper manifold gaskets (from Mondello
>or Mr Gasket).
>Hope you don't have to drill (m)any!
>
>Good luck,
>
>Rick Staples
>75 Eleganza, Louisville, Colorado
>
>
 
Rick I use the mr. Gasket steel gaskets (*the cheapest ones) and put
permatex on both sides. I do not like the felpros they lasted only about 500
miles on mine.

>
>> got to disagree with you on the use of Permatex ultra copper
>
>Tom,
> I agree that Ultra Copper is good stuff, having used it in my work for some
>years. When I bought my GMC, one exhaust manifold was cracked (came off in 2
>pieces), and other was leaking and burnt. I got 2 brand new manifolds from
>Cinnabar, and new special bolts. I used Cinnabar's gasket (Fel-Pro IIRC) on
>one side. On the side with the better-looking sealing surface on the head, I
>installed the new manifold sans gasket, using Ultra Copper sealer just to be
>safe. All bolts were carefully torqued to spec.
> Summer of '97, we drove to and around New England and back, about 5,000
>miles in 2 1/2 weeks. Upon return, the Ultra Copper side was leaking
>slightly, the Cinnabar gasket side was not. I installed a Mr. Gasket solid
>copper gasket on the leaking (left) side (can't resist trying something new if
>it sounds good). So far so good.
> Just my .02, YMMV.
>
>Rick Staples,
>'75 Eleganza, Louisville, CO
>
>
>
 
He's right! Where would we be without heli coils?

Dave Greenberg
GMC Motorhome Registry
200 MacFarlane Dr PH4
Delray Beach, FL 33483-6829

>I agree,manifold studs are a pain.I broke two off below the
>surface.The remedy
>was time consuming,but not that difficult.Check at your auto parts
>store for
>what they call heli-coils.It requires you drill out existing bolts,and
>re-
>thread to a larger size.The heli-coil is then installed with a tool
>supplied
>with the kit.When finished it will receive same size bolt that was
>required to
>start with.The kit will run about $25.00 plus extra coils if
>needed.May sound
>difficult,but with patience its the only remedy sometimes.Main concern
>is to
>keep centered when drilling,starting with smaller bits and working
>up.The
>center stud is concealed,the rest can be seen next to spark plugs.If
>more info
>is needed....mail back.Good luck....
>

___________________________________________________________________
You don't need to buy Internet access to use free Internet e-mail.
Get completely free e-mail from Juno at http://www.juno.com/getjuno.html
or call Juno at (800) 654-JUNO [654-5866]
 
Keep your cool, Rob...we're with you in spirit if not in body helping to
drill those hardened head bolts out!

Dave Greenberg
GMC Motorhome Registry
200 MacFarlane Dr PH4
Delray Beach, FL 33483-6829

On Thu, 22 Oct 1998 23:53:03 -0400 "robteed"
writes:
>OK. So far I havent Broken any down to the block.
> I hope that it doesnt come to that. Did You drill
> those bolts out while the engine is installed?
> That has to be a $%&%$#@!
>Rob Teed
>
>> -----Original Message-----
>> From: owner-gmcmotorhome
>> [mailto:owner-gmcmotorhome]On Behalf Of
>QUECON
>> Sent: Thursday, October 22, 1998 10:35 PM
>> To: gmcmotorhome
>> Subject: Re: GMC: Exhaust Manifolds
>>
>>
>> I agree,manifold studs are a pain.I broke two off below the
>> surface.The remedy
>> was time consuming,but not that difficult.Check at your auto
>> parts store for
>> what they call heli-coils.It requires you drill out existing
>bolts,and re-
>> thread to a larger size.The heli-coil is then installed with a
>> tool supplied
>> with the kit.When finished it will receive same size bolt that
>> was required to
>> start with.The kit will run about $25.00 plus extra coils if
>> needed.May sound
>> difficult,but with patience its the only remedy sometimes.Main
>> concern is to
>> keep centered when drilling,starting with smaller bits and working
>up.The
>> center stud is concealed,the rest can be seen next to spark
>> plugs.If more info
>> is needed....mail back.Good luck....
>>
>
>

___________________________________________________________________
You don't need to buy Internet access to use free Internet e-mail.
Get completely free e-mail from Juno at http://www.juno.com/getjuno.html
or call Juno at (800) 654-JUNO [654-5866]
 
I'm in the process of doing the same thing, my left manifold cracked and
my mechanic said that what you had was normal. I had appx. the same
results. Just expect to drill out 50% of the bolts. Replace using
anti-seize compound. BTW, are you going to reuse your old manifolds???
I'm looking for a left side.

John '76 Palm Beach

>
> I'm trying to get the Exhaust Manifolds off
> the 74' 455 engine. What a Pain! Broke the
> head off two bolts, Got Two out Sucessfully,
> Six Left. All with striped heads. Im planning
> to use a cutting torch to get the rest. Will
> the post left after cutting the heads off be
> very hard to remove????? Has anyone broke one
> off at the block???? Thats My main Worry!
> Thanks,
> Rob Teed
> 74' Painted Desert
> Lansing,Mi
 
Sorry John,
Both of Mine were cracked too bad to even
consider even saving.
Rob Teed

> -----Original Message-----
> From: owner-gmcmotorhome
> [mailto:owner-gmcmotorhome]On Behalf Of John Nepper
> Sent: Friday, October 23, 1998 5:48 PM
> To: gmcmotorhome
> Subject: Re: GMC: Exhaust Manifolds
>
>
> I'm in the process of doing the same thing, my left manifold cracked and
> my mechanic said that what you had was normal. I had appx. the same
> results. Just expect to drill out 50% of the bolts. Replace using
> anti-seize compound. BTW, are you going to reuse your old manifolds???
> I'm looking for a left side.
>
> John '76 Palm Beach
>

> >
> > I'm trying to get the Exhaust Manifolds off
> > the 74' 455 engine. What a Pain! Broke the
> > head off two bolts, Got Two out Sucessfully,
> > Six Left. All with striped heads. Im planning
> > to use a cutting torch to get the rest. Will
> > the post left after cutting the heads off be
> > very hard to remove????? Has anyone broke one
> > off at the block???? Thats My main Worry!
> > Thanks,
> > Rob Teed
> > 74' Painted Desert
> > Lansing,Mi
>
 
I better hope My moms not around when Im
working on the coach. I swore in front of
her back when I was 19...She slamed on the brakes,
pulled Me outa the car, Cuffed me up side the head
and left Me on the side of the road to walk home....
True Story.
Rob Teed 74 Painted Desert

> -----Original Message-----
> From: owner-gmcmotorhome
> [mailto:owner-gmcmotorhome]On Behalf Of
> CHill113
> Sent: Saturday, October 24, 1998 5:43 PM
> To: gmcmotorhome
> Subject: Re: GMC: Exhaust Manifolds
>
>
> In a message dated 10/22/98 10:57:28 PM Central Daylight Time,

>
> >
> Rob, look at it this way, you are also expanding your vocabulary !
> Justin
>
 
Rick, understand you surfaced the manifold then re-installed using the copper
gasket w/o a sealer in order to maintain proper heat transfer but anti-seized
the mounting bolts? Appreciate your imput.

Ray Haywood
1973 Painted Desert
Corning, CA

>
> > Did You drill
> > those bolts out while the engine is installed?
> > That has to be a $%&%$#@!
>
> Rob,
> You got that right! It was over 2 years ago, but I get cramps in my wrists
> from the memory. I still have the drill bit that I had to cut in half to
> allow a straight shot at the worst ones. Used new bolts and copious anti-
> sieze on installation.
> BTW, the Permatex "copper" sealer doesn't work unless both surfaces are
> well-nigh perfect. Recommend the solid copper manifold gaskets (from Mondello
> or Mr Gasket).
> Hope you don't have to drill (m)any!
>
> Good luck,
>
> Rick Staples
> 75 Eleganza, Louisville, Colorado
 
OK, I got the Exhaust Manifolds from Terry. They
look good. I'm going to sandblast them Myself.
Then have them Milled flat. Should I get them Ceramic
coated? Who does this. Would I be able to find someone
local? What do they look like when done? What color
would they be? What about painting them? How much
should I expect to pay for the Ceramic Coating? Do
they coat the inside also? I'm hoping to avoid having
these crack like the last one were! Someone suggested
letting the motor run for 5-10 minutes before shuting
off....Anyone do this? I still have a few bolts to
remove...Were going to weld nuts onto the broken bolt
studs, Then try wrenching them out!
Enough rambling,
Rob Teed 74 Painted Desert Lansing,Mi
 
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