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ARP Head Studs
What am I supposed to tighten my ARP head studs to for a 1.8? Also is there anything else besides tightening to the proper torque required for these in a Miata application? I can't believe how small the studs are either.
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Follow the directions listed on the sheet that came with them. I think it goes something along the lines of hand tighten into the block, install head, apply their moly lube, and tighten to the torque specified on the sheet. Unless you don't have that sheet?
Make sure you follow the correct tightening pattern though. |
I don't have that sheet from ARP. I have the tightening pattern from the shop manual and that's it.
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Oh. You're missing their moly lube then too.
I found the basic instructions online, but I don't have the torque they list. The sheet is over at my dad's where my car and engine is. Sorry. 1) To ensure proper thread engagement and accurate torque readings, clean and re - tap, if necessary, ALL threads in the block. 2) Clean and inspect all hardware prior to installation. Look for obvious defects or shipping damages, plus proper fit, length and dimension. 3) a. If cylinder head studs protrude into water jacket, lubricate the block threads of the studs with ARP THREAD SEALER. b. If cylinder head studs protrude into blind hole, lubricate the threads, nuts and washers with ARP THREAD LUBRICANT or 30wt oil. c. Screw studs into block "HAND TIGHT ONLY" . NOTE: LOCTITE MAY BE USED IF A PERMANENT MOUNTING OF THE STUDS IS PREFERRED. THE FASTENERS, HOWEVER MUST BE TORQUED PRIOR TO THE LOCTITE SETTING UP. 4) Install cylinder heads and check for binding or misalignment. 5) ARP recommends using the ARP MOLY LUBRICANT or at the very least, a good quality Moly Lubricant as opposed to motor oil. This is due to higher friction on the studs as well as inconsistencies in the clamping force of the fasteners when motor oil ( or low quality lubricant) is used. |
I've got the moly lube for them. Did a little searching over on m.net and found one person recommending 65 ft/lbs and that sounds about right. Few other posts had some numbers that I know are way wrong. I guess I'll make some calls in the morning to know for sure.
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Thank you very much.
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Check the calibration on your torque wrench too if you have not done so.
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Did you guys notice that the studs don't thread into the block to a uniform depth?
I've chased the threads, soaked with PB blaster, then blown the holes out with air and some studs sit deeper into the block than others. I don't have a spare head to check thread engagement on the top side, unfortunately. |
Originally Posted by pschmidt
(Post 387436)
Did you guys notice that the studs don't thread into the block to a uniform depth?
I've chased the threads, soaked with PB blaster, then blown the holes out with air and some studs sit deeper into the block than others. I don't have a spare head to check thread engagement on the top side, unfortunately. Also, when I re-torqued them (like you're suppose to with the stock head bolts) they didn't budge a bit. Normal you think? And to the OP, the weird suggested numbers you found on m.net were likely the 85ft/lbs numbers that you have to use when lubing the studs with engine oil instead of the moly lube. |
Originally Posted by pschmidt
(Post 387436)
Did you guys notice that the studs don't thread into the block to a uniform depth?
How far off were the studs relative to each other in your build? |
Originally Posted by pschmidt
(Post 387436)
Did you guys notice that the studs don't thread into the block to a uniform depth?
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Me neither, I'm pretty sure they all went in evenly.
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Two of the studs do sit higher, but its because of the hole location, not actual depth. I think it was the front two studs. The casting on the head are also higher to account for this. Unless my shit was messed up and its not right like that... unless you guys meant each bolt not going in evenly. All of the other ones seemed to be equal to one another in depth.
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If it is just two studs, then it would have to be the ones that are threaded in the holes that have the alignments bushings.
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Originally Posted by mrtonyg
(Post 387471)
If it is just two studs, then it would have to be the ones that are threaded in the holes that have the alignments bushings.
FWIW, my studs look just like those in the picture above. I guess it was at the front of the head that they didn't sink like the rest, not the back like I remembered. |
Got mine in and bolted everything back together. I still can't believe that nobody has problems with head studs on these cars. These things are tiny compared to any other car that I have messed with, especially for a boosted application.
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Originally Posted by JayL
(Post 387479)
Got mine in and bolted everything back together. I still can't believe that nobody has problems with head studs on these cars. These things are tiny compared to any other car that I have messed with, especially for a boosted application.
I've never heard of anyone having head-lift problems in a miata but its a very common issue on hondas... |
Originally Posted by mrtonyg
(Post 387450)
I don't remember ever having that issue.
How far off were the studs relative to each other in your build? I'd say a good quarter inch, if not a little more. It seems to be at random as well; there's no rhyme or reason to it. |
1.6 and 1.8 use the same head studs
hondas have issues because they are open deck :P |
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