^ i see what you did there

 

get that broken bolt out yet?
wind back in your sails?

 

Nope and Nope. Bought a helicoil but even a cobalt bit could not drill through the remaining bolt. I did get the end of the bolt slotted really well with a chisel and then I tried removing it with the impact hammer and it did not budge. I am defeated, it's going to an engine shop Monday. If they cannot get the remaining bolt out then if possible, I will just have that corner of the LIM tack welded to the housing.

 

damn, is that a harded steel bolt?

 

 

Jeez man...Something sounds wrong there....

 

Is it sticking out enough to weld to it?

 

Well, I know for a fact there's a massive batch of cheap chinese cobalt and HSS drill bits out there with the cutting edges ground backwards, better check it wasn't one of those!

 

Not anymore I should have just taken it to the engine shop from day one.

I ordered the bit from Grainger (commercial tool supplier) because none of the normal stores carried them in the size I needed(21/64) for the M8x1.25 Helicoil kit. So after that bit didn't work, then I went to Northern Tool and bought a titanuim bit and a cobalt bit and neither of them worked either. All of the bits started to work but quickly dulled even though i was squirting oil as I was drilling.

 

Drill speed was too high, and/or not enough pressure then, that'll burn up the tip fast. Slow and hard is the rule for drilling bolts out.

The problem is now you'll have work hardened the top of the bolt with the dull drill bits.

 

I tried to keep the drill speed low since the bit recommended drill speed is 1500RPM but I think you are right and now the bolt is hardened.

 

this is the diy learning process--it sucks, but you remember these lessons.
Sorry you are going through this dude.
I agree its time to take it to the Emergency room.

 

I had a "experienced" guy blow out about every drill bit we had in a certain size rage after doing this to 8th inch flat stock steel. Its CRAZY how hard the metal will get after being worked over by a high drill speed.

 

it is crazy, I do bench-rest shooting/reloading and brass get workharded and you have to anneal it every 3-5 reloads and you can totally feed the difference when seating bullets.

 

Yeah, it sucks. Now I need a truck and some muscle to get this bitch to the engine shop .

 

man thats a real bummer.

 

I got the truck...but no muscle

Let me know if you need help and I will swap vehicles with my wife

 

Totally, it has been keeping me up at night thinking, "if only I had not turned it that last turn" but I'm trying to keep a positive attitude. I have learned a lot though and the next time i do this it will be a lot easier.

The engine is pretty light, about 180lbs. What hours do you typically work? Thanks!

 

I was just kidding on the muscle (I'm a tall skinny white guy...lmao)

I am supposed to work 8-5 but I regularly show up at 9 and leave a 2.......what I am saying is I am completely flexible (no one manages me and it all pays the same)

 

[QUOTE=9krpmrx8;4103435]Totally, it has been keeping me up at night thinking, "if only I had not turned it that last turn" but I'm trying to keep a positive attitude. I have learned a lot though and the next time i do this it will be a lot easier.[QUOTE]

yea, make all these mistakes now so when I need your help all the bugs are worked out

 

I don't know how good you are with a grinder, but if you have the skill to hand sharpen drill bits yourself, then go and get a carbide tipped masonry bit, and sharpen it with a grinder to as close as you can to metal geometery - go for a split end and a 135* point though to push through that hardened section.

 

Cool, Thanks. I will call them and find out what time they open, maybe we can knock it out early or in the afternoon. It sucks they are closed on weekends.

I suck with a grinder. Thanks for the input though, much appreciated.

 

I am game for what ever, I have meetings tomorrow morning but am free in the afternoon, mostly free wednesday...thursday and friday are booked.

If you want to try I have an aluminum oxide grinding wheel and know how to sharpen bits by hand, I can bring it over and we can take a few stabs at it before shipping it off for "3rd party support". (I could do that this evening if you want).

just let me know

 

what did you find out?

 

Thanks man, I missed this post. If you are free tomorrow afternoon that would be cool, I can leave work early and we can take it by the engine shop (duffin by the airport). I live at I-10 and Callaghan near castle hills so it's not too far.