Major problem. Head stud broken below deck. Please help!

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Jun 18, 2012 | 07:16 AM

Bafomet

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From: North Royalton

Major problem. Head stud broken below deck. Please help!

I was wrapping up a cam swap and valvetrain upgrade last night and had a new ARP head stud break off below the block when I was putting the driver's cylinder head back on. It snapped about an inch below the deck. I don't understand how or why it happened. I did the right torque sequence according to AllData and had all of the bolts and holes perfectly clean and used the suppplied thread lubricant. The only explanation I can come up with is a defective bolt.

Regardless, I'm screwed right now and I don't have any clue how to get this thing out of my block. Somebody please help me out here.

Jun 18, 2012 | 07:23 AM

97badass

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From: Hillsboro Kansas

Pull the head back off and center punch the bolt then use a smaller reverse drill bit if that don't work try a screw extractor in the hole you drilled.

Jun 18, 2012 | 07:23 AM

00MaroonZ28

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From: Brooklyn Center, MN

Use one of the ez out that you can find at sears or a tool store. Use a drill. It's gonna be tough to get considering that it's torqued in there pretty good and a bit down in the hole. If that doesn't work, you'll have to take it to a machine shop and have them get it out.

Jun 18, 2012 | 10:15 AM

lizeec

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He said its a stud. The studs are just supposed to be installed hand tight, I would try the above mentioned methods, it should have no pressure on it and should back right out.

Jun 18, 2012 | 11:20 AM

tom falco

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Some times a sharp PICK can be used to remove it. If it is bottomed out or on the shoulder it is going to be mighty tough. Normally a stud will back out nicely because they are not bottomed out.

Jun 18, 2012 | 12:17 PM

Bafomet

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From: North Royalton

Good news! I went at it with a left hand drill bit. It caught a bite and backed it out like butter. It definitely was a faulty part. You can tell by how it broke.

Jun 18, 2012 | 04:36 PM

IRONFIST

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From: Calgary Alberta

I broke a ARP head bolt and it was not fun to take out... not impossible but it would have been a lot easier to back out if the thing wasn't a hardened ARP bolt lol.
Glad you got it out, with mine I had to drill it out over a few evenings.

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Jun 18, 2012 | 05:58 PM

KCS

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From: Conroe, TX

Quote:

Originally Posted by 01ssreda4

No, it was a faulty user. You don't use AllData torque specs. Try using ARPs torque specs next time. They are different.

LMFAO, you beat me to it!

Jun 18, 2012 | 06:53 PM

#10

iroczracer07

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At least he got it out, but yeah, you should definitely use ARP's torque specs and procedures..

Jun 19, 2012 | 04:10 AM

#11

vettenuts

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From: Little Rhody

Curious as what the AllData value is that the stud was tightened to? Want to see how it compares to ARP's value with their lube.

Jun 19, 2012 | 06:25 AM

#12

tom falco

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Totally different procedure from factory specks TTY

FROM MY ALL-DATA

Notice: Refer to Fastener Notice in Service Precautions.

Tighten the cylinder head bolts.

9.1. Tighten the M11 cylinder head bolts (1-10) a first pass in sequence to 30 Nm (22 ft. lbs.) .
9.2. Tighten the M11 cylinder head bolts (1-10) a second pass in sequence to 90° using the J 36660-A.
9.3. Tighten the M11 cylinder head bolts (1-8) to 90° and the M11 cylinder head bolts (9 and 10) to 50° a final pass in sequence using J 36660-A.
9.4. Tighten the M11 cylinder head bolts (11-15) to 30 Nm (22 ft. lbs.) . Begin with the center bolt (11) and alternating side-to-side, work outward tightening all of the bolts.

Jun 19, 2012 | 06:26 AM

#13

Old Geezer

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From: GA, USA

And, that...

Quote:

Originally Posted by vettenuts

Curious as what the AllData value is that the stud was tightened to? Want to see how it compares to ARP's value with their lube.

Makes me wonder how many other studs are fubar, but not popped....

Jun 19, 2012 | 10:56 AM

#14

LS1MCSS

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Quote:

Originally Posted by Old Geezer

Makes me wonder how many other studs are fubar, but not popped....

None, the alldata torque spec's is the problem.

Jun 19, 2012 | 02:22 PM

#15

joecar

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From: So.Cal.

Quote:

Originally Posted by LS1MCSS

None, the alldata torque spec's is the problem.

If he used the alldata specs on the other studs then there is a good change they are also fubar;

the problem is the user's faulty selection of procedure/spec... the alldata procedure/spec is not at fault (how does it know if he's not using TTY bolts).

Last edited by joecar; Jun 19, 2012 at 04:38 PM.