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HELP! Drilled too far to remove broken flywheel bolt

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Old 06-14-2013, 10:28 AM
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Default HELP! Drilled too far to remove broken flywheel bolt

Hoping I am OK, but I am thinking I am not F*(K


Ended up snapping one of my crank bolts, don't even ask how. Fail #1. Drilled for an EZ-Out, which was too small for the job, and right as I was thinking I should back it out and go 1 size larger, I snapped it off. Fail #2. Ended up actually being able to drill a bigger hole back through the bolt (was amazed it actually worked with the broken EZ out in there), but then noticed my completely moronic *** drilled too deep and got into the block behind the crank! Epic Fail #3.

I'm not sure where to go from here now. Rough measurements -

Face of crank to non-effed up block surface: ~7/8"

Face of crank to the bottom of my dumbass hole: ~1-3/8". Drill bit diameter is 3/16".

So, I basically have a f*(king 3/16" dia, .5" deep hole in the back of my block, right?


How thick is the block at the rear of the engine?
What's behind the crank there? Isn't it the reluctor wheel?
What happens if there IS a hole right though the block?
Is there an oil galley or anything back there? Can I start the engine with no flywheel to see if I have any leaks?

Any other advice? I absolutely cannot believe I did this. Such a ridiculously dumbass move, and I am guessing, a very expensive mistake now.
Old 06-14-2013, 10:39 AM
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I would imagine that if you did drill thru the block you could just thread the hole and install a plug. Or a regular press style freeze plug for that matter. If you hit an oil galley and went all the way thru then that would be a bit more complicated but doable. Let's just hope you didn't.
Old 06-14-2013, 10:42 AM
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maybe I can find a small set screw and thread it into the block...

Edit: And, yeah - dumb question. Of course I can't start it with the flywheel off....

Last edited by Atrus_SS; 06-14-2013 at 10:51 AM.
Old 06-14-2013, 11:14 AM
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Here's a pic:



Going to see if ACE has a small setscrew that's like 3/8" long that I can thread into there with some high temp thread sealer.
Old 06-14-2013, 12:30 PM
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not to be rude but i think your fucked on this one
Old 06-14-2013, 01:25 PM
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Originally Posted by 3rdCoastPowerSports
not to be rude but i think your fucked on this one
Old 06-14-2013, 01:36 PM
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Originally Posted by 3rdCoastPowerSports
not to be rude but i think your fucked on this one
Originally Posted by JustAFooL
No worries man, I am downright sick to my stomach about this ridiculously embarassing eff up.

In case anyone else is as dumb as me, here was my fix - we'll see if it works...

Got a stainless set screw - M6x1.25. I think it's about 1/4" long. I tapped the hole I drilled, and then applied threadlocker to it (lock-tite red) and threaded it in until it was just barely recessed from the face of the block - maybe recessed .5mm-1mm.

Old 06-14-2013, 03:30 PM
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Atrus SS... Your not stupid, it was a mistake and mistakes happen. live and learn as they say.

" a genius learns from others mistakes, a smart man learns from his own mistakes". I am the latter.
Old 06-14-2013, 03:52 PM
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I think you drilled through the back cover , if you did you can replace that
Old 06-14-2013, 03:52 PM
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I know, I am just hard on myself - if it were something minor, I wouldn't get all up in arms. Drilling a hole through my block, especially in a basically inaccessible place...

Trans is in..working on the MC, and then just install the shifter and driveshaft and hopefully i'll have good news.
Old 06-14-2013, 04:16 PM
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the rear cover just unbolts ,all you have to do is pull off the flex plate or flywheel and take out the 10 bolts and pull it off, auto parts stores have it in stock . Plus you'll be changing the rear main seal
Old 06-14-2013, 04:21 PM
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Originally Posted by 01 Vert ws6
I think you drilled through the back cover
no he didn't, the crank end sets in the cover not around it
Old 06-14-2013, 05:06 PM
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It's definitely not the back cover. The back cover would go around the crank end. This was behind the crank end.
Old 06-14-2013, 05:27 PM
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Any concern for metal remnants getting inside the actual block?
Old 06-14-2013, 06:36 PM
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Originally Posted by niscur29
Any concern for metal remnants getting inside the actual block?
Yes, but I am not sure what I can do about it. Probably just hope the filter catches it and do an oil/filter change very soon.
Old 06-14-2013, 06:45 PM
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Good news is I fired the car up for a couple of mins and I didn't have a river of oil pouring out.
Old 06-14-2013, 07:12 PM
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probably cause the flywheel is slingin it around the bellhousing.........







I kid, I kid..it's a good fix I wouldn't sweat it.
Old 06-14-2013, 07:30 PM
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Can I get a further out pic, so I can see where in relation the damage is? The main cap is there. Did you drill into the cap? The block? A cap bolt passage? This really sucks, but depending on where it's at, I agree you could likely just tap and install some sort of plug.
Old 06-14-2013, 08:01 PM
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Looking at the first pic you posted it appears you drilled into one of the main cap bolts. Looking at your fix you'll probably be okay if the metal shavings don't go through the oil pump and the bolt still holds
Old 06-14-2013, 08:09 PM
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If you ever have anything like this happen again, just get a left handed drill bit. As you drill use a lot of pressure and the bit will usually grab. When it does, the bolt most likely will screw itself right out.


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