 head bolts |
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 Jun 26, 2010 - 9:46 AM
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Enthusiast Joined Apr 7, '10 From grove city Currently Offline Reputation: 0 (0%)  |
do you need to replace the head bolts every time you take them out on a 7afe?
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Jun 26, 2010 - 10:49 AM
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Enthusiast  Joined Mar 11, '06 From Way South Chicago Currently Offline Reputation: 0 (0%) |
is the torque spec a lb/ft +degrees of a turn? if so then yes.
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Jun 26, 2010 - 10:55 AM
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 Enthusiast Joined Aug 12, '07 From Lancaster, Pa Currently Offline Reputation: 35 (100%) |
it is always a good idea to replace head bolts when they are being taken out, but it is not a must.
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Jun 26, 2010 - 9:47 PM
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Enthusiast Joined Apr 7, '10 From grove city Currently Offline Reputation: 0 (0%) |
ya you torque them to 22ft/lbs then 90 degrees and then another 90 degrees... so they need replaced every time??
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Jun 26, 2010 - 10:39 PM
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Enthusiast Joined Mar 11, '06 From Way South Chicago Currently Offline Reputation: 0 (0%) |
yes
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Jun 26, 2010 - 10:40 PM
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Enthusiast Joined Dec 8, '03 From Lancaster CA Currently Offline Reputation: 6 (100%) |
it is recommended to replace them, but i re-used them in erynns car and there is no problems. you can mic the bolts and if they are in spec, they are ok to re-use
-------------------- 2001 Celica GT-S Turbo
1997 Supra TT 6speed 1997 Celica 3MZ/1MZ swap 1990 Celica All-Trac |
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Jun 27, 2010 - 7:08 AM
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 Moderator Joined Oct 1, '02 From fall river, ma Currently Offline Reputation: 13 (100%) |
OEM head bolts are torque to yeild bolts.
meaning, you tighten them to a specific # value, then another 90*. what that last 90* is stretching the bolt. any bolt thats torque to yeild should be replaced. (especially if you dont know if they have ever been loosened and reused before.) IMO reusing them is a bad idea. they are relitivly cheap, and if one were to bottom out from overstreching it and snap, it would get ugly. -------------------- Former Team 5SFTE pro member ;)
 13.6@108MPH, 5SFTE Powered |
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Jun 27, 2010 - 8:17 AM
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Enthusiast Joined Mar 11, '06 From Way South Chicago Currently Offline Reputation: 0 (0%) |
QUOTE (presure2 @ Jun 27, 2010 - 8:08 AM)  OEM head bolts are torque to yeild bolts. meaning, you tighten them to a specific # value, then another 90*. what that last 90* is stretching the bolt. any bolt thats torque to yeild should be replaced. (especially if you dont know if they have ever been loosened and reused before.) IMO reusing them is a bad idea. they are relitivly cheap, and if one were to bottom out from overstreching it and snap, it would get ugly. having dealt with snapped head bolts...they're not THAT bad. you can usually lift the head directly off and then use vice grips to spin them out or a brass drift to get them turning and then out...or very delicately with a sharp steel punch. -------------------- |
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Jun 27, 2010 - 9:54 PM
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Enthusiast Joined Apr 7, '10 From grove city Currently Offline Reputation: 0 (0%) |
well the thing is i just rebuilt my 7a and i got performance head bolts. there was no compression so i had to remove the head before it was even started. and when i put it back together i used the same performance head bolts. and now my car is overheating. its boiling the water in the resevior. so i thought that maybe they didn't seal the head gasket... would that be the case or is it prob another problem...?
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