Drilling out an exhaust manifold stud

Navajo350 · May 31, 2015

If I decide to drill out a broken off stud, how do you prevent fragments from falling into the unknown. I don't have he engine off the tractor.

Thanks.

guido · May 31, 2015

Hello navajo350,

Put grease all.around the work area. Remember speed kills! A sharp but will.cut at 1
R.P.M.

Guido.

Janicholson · May 31, 2015

two ideas: use a shop vac and put a plastic elbow on the end of the suction hose. Drill through the elbow so the bit comes out the center of the non-attached opening in the elbow. Use this to suck on the hole being drilled. Another idea is to use grease on the bit (apply grease every time the grease is pushed out. (many applications)
Drill the center exactly the first time as there is no good second time. Do it in 3 stages. Jim

Navajo350 · May 31, 2015

(quoted from post at 12:18:33 05/31/15) two ideas: use a shop vac and put a plastic elbow on the end of the suction hose. Drill through the elbow so the bit comes out the center of the non-attached opening in the elbow. Use this to suck on the hole being drilled. Another idea is to use grease on the bit (apply grease every time the grease is pushed out. (many applications)
Drill the center exactly the first time as there is no good second time. Do it in 3 stages. Jim

Do I still need to incrementally heat up the stud?

Tom in Ga · May 31, 2015

When trying to drill out a broken bolt, I know you have to drill the center of the bolt. Question is how do you find the exact center and not drill it
wrong? I have wondered about this before and don't have an answer. Thanks, Tommy

Dick L · May 31, 2015

To find center I use a ruler marked in 64ths and mark center with a center punch lightly. Using the ruler move the center dimple with the center punch if needed by tapping harder until I can start a small drill in the dimple. I then keep a check on the center as I deepen the small pilot hole. You can use a small square close to the drill bit to make sure you are holding the drill straight. Taking extra caution getting the pilot hole on center and straight is the key to success. After you do a few the fear will leave and it will become easy.

TimV · May 31, 2015

A $12 set of HF (or any other China-mart you have handy) transfer punches are an absolute must-have for any toolbox--you'll find so many uses for them you'll wonder how you ever got along without them. Just use them gently--all you're doing is marking the location of the center, you don't need to whale away with a 4-lb sledge--and they'll last forever. From there, use a center drill--again, cheapies can be had for a couple bucks, and all you're doing is deepening the starter hole so your good bit will hit the correct spot.
HF transfer punches

JRSutton · May 31, 2015

Depends on exactly where or what you're doing, but strong magnets stuck in the path of where you don't want stuff to go can be pretty
effective.

Drilling out an exhaust manifold stud

Navajo350

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guido

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Janicholson

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Navajo350

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Tom in Ga

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Dick L

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TimV

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JRSutton

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