Broken Stud Extraction

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Mar 17, 2006 | 07:25 PM

corvetteload

Thread Starter

Melting Slicks

Joined: Aug 2005

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From: Confusion

Broken Stud Extraction

Can anyone recommend a method or place to remove exhaust manifold studs? Thread keepage is mandatory!!! Thanks..................B

Mar 17, 2006 | 08:51 PM

onaqwst

Le Mans Master

Joined: Nov 2004

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From: detroit area

if it's a stud, u can just use 2 nuts and thread them on and tighten them to each other and then use the nut between the first nut and the block for the unloosing..........

b

Mar 17, 2006 | 09:25 PM

JRD77VET

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From: Zionsville, PA NRA Life Member

St. Jude '03-'04-'05-'06-'07-'08-'09-'10

Can you get vise grips on the stud? If so, heat the manifold as hot as you can get it with a propane torch ( plumbers torch). Then put on the vise grips and try to turn it out.

If it's broken close to flush, remove the exhaust manifold. Grind the old stud flat. Center punch the stud as close to center as you can. The thread is 3/8-16 NC which uses a 5/16" (.3125) pilot drill.

Hold the exhaust manifold in a vise or other secure method. Start with a smaller drill ( 1/4) and drill thru the stud. ( make sure you are drilling square to the surface so you don't make an out of round hole )Work your way up to 5/16 if the stud doesn't come out. Clean all the threads with the tap.

Jeff

Mar 17, 2006 | 09:41 PM

Big Fish

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From: St. Charles IL

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If you have a little sticking out you can weld a bolt to it and use a wrench. Try some heat from an oxy/acetylene torch around the stud if it doesn't come easily.

Mar 18, 2006 | 07:27 AM

ICEMAN59

Drifting

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From: COVINGTON LA

Any good tool supply will sell a stud extractor ie (Sears, MSC, WW Grainger, etc).

Mar 18, 2006 | 02:07 PM

corvetteload

Thread Starter

Melting Slicks

Joined: Aug 2005

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From: Confusion

I used a stud extractor and heat and it still snapped, it is flush with the manifold now. I went through this with a manifold last year (must be me!!) and took 3 days of drilling to remove (bad drills?!?!?!). I have contacted a shop that extracts them somehow so I don't have to fool with the other 2 also. Here is a link to them, just wondering if anybody ever used this method.
http://www.brokentap.com/services.html
http://www.Cammann.com/

Mar 18, 2006 | 05:27 PM

JRD77VET

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From: Zionsville, PA NRA Life Member

St. Jude '03-'04-'05-'06-'07-'08-'09-'10

If it took you three days, you definitely have very dull drills. With a hand drill going slow, it shouldn't take more than 5 minutes.

When you get a stud kit, make sure it has brass nuts. They are less likely to seize.

Mar 18, 2006 | 05:51 PM

68raggtop

Racer

Joined: Jan 2004

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From: 20,000 leagues under the sea

Quote:

Originally Posted by JRD77VET

If it's broken close to flush, remove the exhaust manifold. Grind the old stud flat. Center punch the stud as close to center as you can. The thread is 3/8-16 NC which uses a 5/16" (.3125) pilot drill.

Hold the exhaust manifold in a vise or other secure method. Start with a smaller drill ( 1/4) and drill thru the stud. ( make sure you are drilling square to the surface so you don't make an out of round hole )Work your way up to 5/16 if the stud doesn't come out. Clean all the threads with the tap.

Jeff

I will also add, left hand twist drills are best for this. If they grab, they are turning in the correct direction.

also alternating heating and penetrating oil may help.