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Old 05-07-2013, 06:01 PM
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ARP Head Bolt Broke

Had noticed that it was leaking...thought when I rebuilt it I had forgotten the sealer...this is #16 in the torque sequence on the passenger side.

Then I notice that it had apparently 'backed out' an inch...but it had actually broken.

How weird huh? I had used an ARP head bolt kit.

What could have caused this....defective bolt?......Insufficient torque...I remember pretty distinctly using a torque wrench when I rebuilt this engine a few years ago.

Needless to say the head gasket is probably blown....I drilled and easy outed it.....put a temporary bolt in there until I can get to replacing the head gasket

Heads are iron fwiw, Iron Eagle, or the Chevy version.......forget

z

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Old 05-07-2013, 07:25 PM
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Quote:
Originally Posted by zardiw View Post
Had noticed that it was leaking...thought when I rebuilt it I had forgotten the sealer...this is #16 in the torque sequence on the passenger side.

Then I notice that it had apparently 'backed out' an inch...but it had actually broken.

How weird huh? I had used an ARP head bolt kit.

What could have caused this....defective bolt?......Insufficient torque...I remember pretty distinctly using a torque wrench when I rebuilt this engine a few years ago.

Needless to say the head gasket is probably blown....I drilled and easy outed it.....put a temporary bolt in there until I can get to replacing the head gasket

Heads are iron fwiw, Iron Eagle, or the Chevy version.......forget

z
The HG might still be OK. Check the plug adjacent to the bolt to see if it shows any sign of coolant. Check the oil for water and vice versa.

If that all checks out, get a replacement bolt and torque it down. Run the engine long enough to fully heat it up, cool it overnight and retorque it.
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Old 05-07-2013, 08:13 PM
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Thanks Cobalt.......yeah......I put an old bolt in there and torqued it down....will see how it runs.........Still can't figure out why a head bolt would just break like that.......***..........lol.........

Also.......she was pumpin white smoke out the exhaust...that's what made me look.........pretty sure HG is blown.....but miracles do happen.......lol

I used that $80 Blue stuff awhile back.........worked good.......maybe use it again.......but I shouldn't be lazy......just fix the damned thing

Maybe I should check the ones under the valve cover............z

Last edited by 68NovaSS; 05-07-2013 at 09:58 PM. Reason: Profanity issue
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Old 05-07-2013, 09:45 PM
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If it was blowing steam, the die is cast. Time for a new HG along w/checking the calibration of the torque wrench you used to torque the bolts.

Use a torque wrench to remove the bolts in reverse order. If the break loose torque is excessive (indicating the bolts have been over torqued) OR is insufficient (indicating the bolts have been over stretched), OR if there's any question in your mind that something might have been done wrong that could have damaged the fasteners, I'd want to use fresh hardware. If they were over torqued and were right at the edge of deformation, heating the engine up could have been enough to break a bolt outright. Assuming that, the rest might not have been far behind, and could have become over stretched.

Note- be aware that the break loose torque is less than the applied torque in most cases. If some sort of sealer that sets up and/or hardens was applied to the threads, the break loose torque may be higher than normal. Even so, look for uniformity between the bolts as you loosen them. If you find any that are quite a bit easier to loosen you know you've got a problem, and I'd recommend replacing them all.
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Old 05-08-2013, 06:44 PM
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Thanks for the reply Cobalt!!

Well, looks like my Stars are Lucky

Put that old bolt I had in and torqued it down..........Engine seems to run normally.......no smoke.......etc.

New headgaskets are better than the old ones....and I'm pretty sure I used a good one when I rebuilt it to a 383 a lotta years ago.

Took it to CarQuest to see if they had a bolt.....but they just sell the set...

Guy said that over time they stretch and may break like mine did.

He said it's a good idea to replace all of em after a number of years.........and that's what I'm gonna do

When I get the money......damn....some of these bolt sets are EXPENSIVE....

Car Quest sells a set by Victor for like $33/side........they have sealer already on the bolts.........and I think that's how I'm gonna go....

Take one out at a time and replace it with a new one.

Not driving it until I can buy a set.....

z
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Old 05-08-2013, 07:17 PM
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Quote:
Originally Posted by zardiw View Post
Thanks for the reply Cobalt!!.

Took it to CarQuest to see if they had a bolt.....but they just sell the set...

Guy said that over time they stretch and may break like mine did.

He said it's a good idea to replace all of em after a number of years.........and that's what I'm gonna do


Car Quest sells a set by Victor for like $33/side........they have sealer already on the bolts.........and I think that's how I'm gonna go....

Take one out at a time and replace it with a new one.

Not driving it until I can buy a set.....

z
That victor set is a stock replacement. Add some teflon paste sealer to the threads.
I honestly never head of head bolts needing replacement after a couple of years, but hey I don't sell parts.
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Old 05-09-2013, 10:30 AM
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They already have a sealer on the threads...........add more?

z
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Old 05-09-2013, 12:15 PM
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They already have a sealer on the threads...........add more?

z
Yep! I would
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Old 05-10-2013, 07:26 AM
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Got the head bolts switched on the pass side.........wow.......some of them were pretty loose.......Maybe I didn't retorque them when I built it.....PITA when you got headers.......least on the drivers side.......pass side is pretty easy.......This on a C20 Truck.....z
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