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Ugh Need some help/ideas
#1
OK. Well subject says it all. Getting prepped to reinstall my valve covers and there were a few I noticed during removal of the bolts that were grabbing somewhat so I decided it was a good idea to run a tap to clean up the threads. Well got to the last one and the damn tap snapped off in the hole just below the surface. See pic below. Any ideas on how to get this out? As always I appreciate any help/ideas!

[Image: broken_tap.jpg]

'73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

'73 F code convertible. Bright red. Needs total restore. (IE HOT MESS)

- Jason
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#2
If you're careful you could try an undersized drill bit and save the threads, I'd use a punch and steady hands. I've also had luck with using a small drill bit, go about 1/2 way through the bolt and reverse the drill. Good luck

Gas is for cleaning parts, alcohol is for drinkin, nitro is for racin
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#3
@studdley was faster
It hapen me once on a toyota corolla engine. I grinded very roughtly a concrete drill, to give it teeth, heat gunned the block near hole and was lucky enough to get it out almost right away with the drill on reverse and set on hammer position while pushing relatively hard.
If your thread was originaly just full of crap which is likely the case for valves cover small holes, You can hope its not stuck bitting very hard, and it could get loose after just few attempts. You are lucky its not flat broken, you should get some friction...

Crossing fingers for you!

73 modified Grandé 351C. Almost done. 
71 429CJ. In progress
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#4
Problem is it isn't a bolt. It is a tap so it is hardened steel. There is no way to drill into it being hardened steel and no flat spot to try and even get one started. I tried an automatic center punch on it to see if I could get a spot to start a drill bit and didn't make a mark.

'73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

'73 F code convertible. Bright red. Needs total restore. (IE HOT MESS)

- Jason
  Reply
#5
(09-20-2018, 03:14 PM)Fabrice Wrote: @studdley was faster
It hapen me once on a toyota corolla engine. I grinded very roughtly a concrete drill, to give it teeth, heat gunned the block near hole and was lucky enough to get it out almost right away with the drill on reverse and set on hammer position while pushing relatively hard.
If your thread was originaly just full of crap which is likely the case for valves cover small holes, You can hope its not stuck bitting very hard, and it could get loose after just few attempts. You are lucky its not flat broken, you should get some friction...

Crossing fingers for you!

That might be the ticket there Fabrice. I have a good assortment of concrete bits so I am thinking I will get that a go.

'73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

'73 F code convertible. Bright red. Needs total restore. (IE HOT MESS)

- Jason
  Reply
#6
(09-20-2018, 03:14 PM)73pony Wrote: Problem is it isn't a bolt. It is a tap so it is hardened steel. There is no way to drill into it being hardened steel and no flat spot to try and even get one started. I tried an automatic center punch on it to see if I could get a spot to start a drill bit and didn't make a mark.

Stop while you are ahead... Drink a beer.

Do NOT drill it.

Try a tap extractor first.  Buy a quality one that is the right size for the tap you broke.  The one below is for a 4 flute 1/4" tap.  If that fails to work then you can go to other methods.  I would hesitate to try a punch until you try a tap extractor first. Sometimes if they are really stuck the tap will just fracture when trying to unscrew it with a punch.  A quality USA made tap extractor is worth it's weight in gold.



[Image: Capture_Tap.png]
[+] 2 users Like Bentworker's post
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#7
(09-20-2018, 03:16 PM)73pony Wrote: That might be the ticket there Fabrice. I have a good assortment of concrete bits so I am thinking I will get that a go.

Its hard to see while zoomed pict to max, but looks like you could also try grind/cut a bit in a tripod shape, so the teeth would bite on the sides rather than the center.

When it broke btw, was it you seeing a nice girl walking by your garage and you suddenly moved or were you using a tad too much force? These things are usually quite hard.

73 modified Grandé 351C. Almost done. 
71 429CJ. In progress
  Reply
#8
(09-20-2018, 03:28 PM)Fabrice Wrote:
(09-20-2018, 03:16 PM)73pony Wrote: That might be the ticket there Fabrice. I have a good assortment of concrete bits so I am thinking I will get that a go.

Its hard to see while zoomed pict to max, but looks like you could also try grind/cut a bit in a tripod shape, so the teeth would bite on the sides rather than the center.

When it broke btw, was it you seeing a nice girl walking by your garage and you suddenly moved or were you using a tad too much force? These things are usually quite hard.

Ha good one. Neither unfortunately. I was using a hand tap wrench with not much force and the garage door was closed so I can use that excuse either.

'73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

'73 F code convertible. Bright red. Needs total restore. (IE HOT MESS)

- Jason
  Reply
#9
(09-20-2018, 03:22 PM)Bentworker Wrote: Try a tap extractor first. 

Wait, there is a tool for these unlucky moments?

73 modified Grandé 351C. Almost done. 
71 429CJ. In progress
  Reply
#10
(09-20-2018, 03:22 PM)Bentworker Wrote:
(09-20-2018, 03:14 PM)73pony Wrote: Problem is it isn't a bolt. It is a tap so it is hardened steel. There is no way to drill into it being hardened steel and no flat spot to try and even get one started. I tried an automatic center punch on it to see if I could get a spot to start a drill bit and didn't make a mark.

Stop while you are ahead... Drink a beer.

Do NOT drill it.

Try a tap extractor first.  Buy a quality one that is the right size for the tap you broke.  The one below is for a 4 flute 1/4" tap.  If that fails to work then you can go to other methods.  I would hesitate to try a punch until you try a tap extractor first. Sometimes if they are really stuck the tap will just fracture when trying to unscrew it with a punch.  A quality USA made tap extractor is worth it's weight in gold.



[Image: Capture_Tap.png]

I have that exact one I ordered from them when this happened. I have been unable to get the fingers to go down into the flutes more that 1/16 to 1/8 inch. I know if I try to put any force on it with that little bit of contact I'm just going to break the extractor.

'73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

'73 F code convertible. Bright red. Needs total restore. (IE HOT MESS)

- Jason
  Reply
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