exhaust manifold studs - The 1947 - Present Chevrolet & GMC Truck Message Board Network

67 LWB · 05-31-2002, 08:29 AM

Im getting ready to clean and repaint my manifolds and I cant get 2 studs out of one. I have been soaking it in wd-40 for about a week now and I still cant get them out? Any help guys?

*Randy70C-10* · 05-31-2002, 08:34 AM

The only other way is to heat them with a torch.

67 LWB · 05-31-2002, 09:09 AM

Randy how hot do you have to get it? do you think one of those little propane torches will work?
thanks Devin

dubie · 05-31-2002, 09:28 AM

Yeah a propane torch will work for that. We used to use that all the time at the auto ranch for getting those little bastards out.

Willy Prost · 05-31-2002, 09:38 AM

The studs are notorious for not coming out. I believe that Randy70C-10 means acetylene torch, not propane.

I had a friend that worked at a muffler shop who routinely burned the studs out with a cutting torch. then he ran a tap to clean up the threads.

I first would heat the manifold and try to remove the studs. Only if the stud snapped, then I would burn and tap.

67 LWB · 05-31-2002, 09:38 AM

So do you have to heat up the stud or the manifold itself?
Thanks

JimKshortstep4x4 · 05-31-2002, 09:51 AM

You need to heat the manifold itself. Usually you have to get it
pretty hot, (cherry red), for the stud to come out. Try not to heat the stud as it weakens it, and be carefully not to pull the stud to the side as they will bend easily when hot.

When the manifold ear is hot, the studs will come out easily, most of the time. If they turn too hard, I will heat them up more.

Good luck,

Jim

**Classic Heartbeat** · 05-31-2002, 09:58 AM

Maybe I have been lucky, but I have never had to heat the manifold ears untill they were cherry red. Propane torches have worked well for me. The idea is to get the ear hot enough to expand the metal arround the stud, without heating the stud itself. WES www.ClassicHeartbeat.com

Mike C · 05-31-2002, 12:09 PM

The heat also helps to break the chemical bond between the stud and the manifold (oxidation, ie RUST). It does not have to be "red" hot. Heating the manifold makes it expand away from the stud, but heating the stud gets the heat more locally to the threads. Who cares about weakening the stud as you are going to throw it away, as long as it doesn't break off! You may try using candle wax once you get the stud hot. Place it around the base where it joins the manifold and the wax will wick into the joint using capillary action and help lubricate/release the threads.

67 LWB · 05-31-2002, 09:41 PM

Thanks for the replies guys, I will give it a try tommorrow
Thanks Devin

05-31-2002, 08:29 AM	#1
67 LWB Registered User Join Date: Jan 2002 Location: COLORADO SPRINGS Posts: 102	exhaust manifold studs Im getting ready to clean and repaint my manifolds and I cant get 2 studs out of one. I have been soaking it in wd-40 for about a week now and I still cant get them out? Any help guys? __________________ '67 C10 LWB FLEETSIDE, WEAK 305 , TH400, 3.73 REAR COLORADO SPRINGS, CO.

05-31-2002, 09:09 AM	#3
67 LWB Registered User Join Date: Jan 2002 Location: COLORADO SPRINGS Posts: 102	Randy how hot do you have to get it? do you think one of those little propane torches will work? thanks Devin __________________ '67 C10 LWB FLEETSIDE, WEAK 305 , TH400, 3.73 REAR COLORADO SPRINGS, CO.

05-31-2002, 09:28 AM	#4
dubie Registered User Join Date: May 2000 Location: Flin Flon, Manitoba, Canada Posts: 8,853	Yeah a propane torch will work for that. We used to use that all the time at the auto ranch for getting those little bastards out. __________________ My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795

05-31-2002, 09:38 AM	#6
67 LWB Registered User Join Date: Jan 2002 Location: COLORADO SPRINGS Posts: 102	So do you have to heat up the stud or the manifold itself? Thanks __________________ '67 C10 LWB FLEETSIDE, WEAK 305 , TH400, 3.73 REAR COLORADO SPRINGS, CO.

05-31-2002, 09:58 AM	#8
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,766	Maybe I have been lucky, but I have never had to heat the manifold ears untill they were cherry red. Propane torches have worked well for me. The idea is to get the ear hot enough to expand the metal arround the stud, without heating the stud itself. WES www.ClassicHeartbeat.com __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

05-31-2002, 08:34 AM	#2
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	The only other way is to heat them with a torch.

05-31-2002, 09:38 AM	#5
Willy Prost Senior Member Join Date: Jan 2000 Location: Arlington, VA Posts: 398	The studs are notorious for not coming out. I believe that Randy70C-10 means acetylene torch, not propane. I had a friend that worked at a muffler shop who routinely burned the studs out with a cutting torch. then he ran a tap to clean up the threads. I first would heat the manifold and try to remove the studs. Only if the stud snapped, then I would burn and tap.

05-31-2002, 09:51 AM	#7
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	You need to heat the manifold itself. Usually you have to get it pretty hot, (cherry red), for the stud to come out. Try not to heat the stud as it weakens it, and be carefully not to pull the stud to the side as they will bend easily when hot. When the manifold ear is hot, the studs will come out easily, most of the time. If they turn too hard, I will heat them up more. Good luck, Jim

05-31-2002, 12:09 PM	#9
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,727	The heat also helps to break the chemical bond between the stud and the manifold (oxidation, ie RUST). It does not have to be "red" hot. Heating the manifold makes it expand away from the stud, but heating the stud gets the heat more locally to the threads. Who cares about weakening the stud as you are going to throw it away, as long as it doesn't break off! You may try using candle wax once you get the stud hot. Place it around the base where it joins the manifold and the wax will wick into the joint using capillary action and help lubricate/release the threads. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

05-31-2002, 09:41 PM	#10
67 LWB Registered User Join Date: Jan 2002 Location: COLORADO SPRINGS Posts: 102	Thanks for the replies guys, I will give it a try tommorrow Thanks Devin __________________ '67 C10 LWB FLEETSIDE, WEAK 305 , TH400, 3.73 REAR COLORADO SPRINGS, CO.

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