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Old 08-26-2018, 07:20 PM   #1
DavidtheM
 
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Stripped bolt in head...

I made a rookie mistake and this happened... over torqued bolt and it snapped in the head. How messy of a fix is this? I'll be taking my car to a shop for this, just want to know how serious it is and what it will take to fix

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Old 08-26-2018, 07:45 PM   #2
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Take the intake off and see if you can get the bolt out. Use a small pick or screw driver to turn it out
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Old 08-26-2018, 08:47 PM   #3
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What he said ^^^^^ may be put some PB Blaster in the hole and let it sit over night too.
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Old 08-27-2018, 03:43 AM   #4
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I've done it before. Had to use a easy out, but if it snaps clean it should just take a slow steady hand. Took all of 15 mins if that.

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Old 08-27-2018, 03:44 AM   #5
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Replace with ARPs from summit

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Old 08-27-2018, 05:18 AM   #6
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Well, here is the deal. Most of those manifold bolts thread into an open cavity above the lifter trays. Drilling it is a very delicate process. I would try turning it with a pick as Clarkstar suggested, and if that does not work, try to center punch it and use a Left Handed drill bit, but make absolutely sure you drill as shallow as possible.
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Old 08-27-2018, 09:04 AM   #7
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Intake bolt? Should be a piece of cake. Remove manifold. Tap lightly downward on remaining bolt. Work at it until it comes out.

Keep in mind a bolt with no head has no torque on it. The only thing holding it in is the thread bind. Tap downward lightly to release the thread bind.

Don't make it worse... if that doesn't work easily find someone really good at using an EZ out. And not just getting in there and hogging it out with a big drill. That small a bolt with next to no tq should come out with ease. If broke off below the head surface, drill a pilot hole in the center and EZ out it. Do not hog out the head hole until an absolute last resort.

If you do see it is below the head surface, could set the manifold back on and use that sleeved hole as a guide to center pilot drill into the bolt. Use a new really good bit and put some tape around the shank to keep it centered in the manifold sleeve. Then EX out. The key is no drilling into head material, and make sure the pilot hole is starting in the center of the broken bolt. It's an art that takes practice. Often drilling down into it will grab the bolt by itself, cuz...it's just sitting in there once the thread bind releases.
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Old 08-27-2018, 10:39 AM   #8
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Just be patient and you'll get it
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Old 08-27-2018, 11:25 AM   #9
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Thanks all for the advice! I'll be purchasing some ARP bolts. Haven't had time to take the IM off yet, but sounds like I won't have too much trouble removing the stripped bolt

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Old 08-27-2018, 02:13 PM   #10
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Save your money on the fancy bolts and spend it on a service manual and really good torque wrenches. Also get an angle meter. Many bolts these days are tq to yield, measured by angle not tq.

It's a dry manifold, very little tq required. Hence the reason for small bolts. OE bolts work perfect. The sleeve is also there to try to prevent crushing from over tq. The next line of defense is small bolts. If you up the bolt strength, you are removing one of the overtq defense strategies.

Lubing up ARP bolts on an LS motor is a sure way to induce tons of problems. If you've modded something justifying increasing the tq, such as forced induction, then it's time to up the fastener strength...ie head studs. Even then, using the wrong lube can cause way over-torque. If using a plastic stock manifold, I can't imagine why a stronger bolt would be needed.
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Old 08-28-2018, 06:07 AM   #11
Synner


 
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I agree on the torque wrench, no need for expensive bolts just the right tools. Snapping off hardened bolts just makes extraction tougher.
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Old 08-28-2018, 10:23 AM   #12
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The best tool you could ever buy for a car is the service manual.

The intake bolts require threadlocker. 5 N-m on the first pass. 10 N-m on the second pass.
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Old 08-29-2018, 09:39 AM   #13
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Another option: If you remove the manifold and depending what is left of the bolt, you can use a Dremel- cut a slot in the bolt and use a flathead screwdriver and back it out.
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Old 08-29-2018, 03:10 PM   #14
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Thanks all for the input. It's extremely helpful. Here's a close-up of the damage with the intake manifold off

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