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Old 11-22-2009, 02:11 PM   #1
PSolbergfan
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Default Head bolt question

Do you NEED to replace head bolts when rebuilding or replacing head gaskets. My local Subaru dealer says you don't need to. I was always told that when you remove a head bolt, throw it away. They're junk because they stretch when you torque them.
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Old 11-22-2009, 02:25 PM   #2
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there is a tool to measure stretch and there are tolerances. they def do stretch. i don't know about remove and throw away but arp head studs can be bought for under 200$.
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Old 11-22-2009, 02:38 PM   #3
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This subject has been covered numerous times over the years.

Subaru does not prescribe new bolts when changing headgaskets. Subaru does not use cheap steel in those bolts (as some other mfgrs do). I've done dozens of changes and never had any issues with re used headbolts.

If it makes you sleep better at night....buy new ones.

Jay
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Old 11-22-2009, 02:41 PM   #4
69subaru360
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I never replace the bolts doing head gaskets. I've never had a problem and I have done a ton of head gaskets.
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Old 11-22-2009, 02:47 PM   #5
rek888v2
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Some will say you do and that they stretch. Some will say you dont. I personally used the same head bolts for 3 rebuilds on my last motor without any issues, as long as they are torqued bak down to spec. To solve the problem though, use head studs! APR FTW!
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Old 11-22-2009, 03:20 PM   #6
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are you talking about factory head studs? or aftermarket ones like ARP's or something.. I got a pair of ARP's from a friend w low miles, will it be ok to put them in my car wen I do headgasketa
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Old 11-22-2009, 03:23 PM   #7
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you can get the tolerances of the arp bolt new and simply measure it. i have seen differences in stretched bolts from a same set but we are talking about in the ten thousands of a difference. i wouldn't worry about using stock head bolts over if your below 350 whp.
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Old 11-22-2009, 10:45 PM   #8
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Thanks for the info everybody! It helps a lot. I am talking about the OEM head bolts.
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Old 11-23-2009, 05:18 AM   #9
rek888v2
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Yes, you can reuse head bolts, I have used the same ones 3 times on the same motor.
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Old 11-23-2009, 06:30 AM   #10
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There was a dealer that posted on here. For new bolts they uses the special tightening pattern. For used bolts, he just torques them. I don't recall the value...but it was maybe 76 ft-lbs? Don't quote me on that though.
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Old 11-23-2009, 07:12 AM   #11
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Unfortunately, I don't think it's the best advice to follow a procedure devised by someone working on flat rate. There's a few ways to trim time off the job, but I don't think the torque sequence should be one of them.

Jay
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Old 11-23-2009, 08:14 AM   #12
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I've always followed the entire sequence myself.
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Old 11-23-2009, 08:22 AM   #13
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Quote:
Originally Posted by Mechie3 View Post
I've always followed the entire sequence myself.
I didn't think you would....Just kinda tossing it out there for others.

Jay
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Old 11-23-2009, 08:38 AM   #14
rek888v2
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They have TQ/sequance specs for a reason. Always follow them, I didnt once and, well, you can guess. Very expensive lesson.
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Old 11-23-2009, 03:50 PM   #15
PSolbergfan
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I'll ask my local subaru tech. He's never steered me in a wrong direction.
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