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Old 06-30-2005, 08:00 AM   #1
cudaeh
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Default do i need to replace the head bolts?

Well I picked up all my gaskets for the head gasket replacement, $171 worth. I mentioned to my friend all the stuff I bought and he read me the riot act because I said I didn't buy new head bolts. He said that when ever you take your heads off you sould replace the bolts. The theory he said was that when ever you torque a bolt down it stretches the bolt, when you take it out the bolt is still streched. I asked my dad (old school muscle guy) and he said that that was the case with corvair bolts back in the day because the bolts they used stock were too thin.
My question is have things changed that much between my dads time and mine?
Do I need to replace my headbolts or is that just paranoia?
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Old 06-30-2005, 10:52 AM   #2
Russell Rogers
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YES You do do needto replace them. Buty do a search because awhile back there was a discussion on wheteher or not you had to. But froma mechanics point of view. ie...me. I would.
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Old 06-30-2005, 11:00 AM   #3
ImprezaRallystyle
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not that i want to argu with you roger but at my local subaru dealer, my mecanic did over 75 motor job last year and he never replace the head bolt by new one.

Even in my race car he put back the original head bolt.
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Old 06-30-2005, 01:03 PM   #4
cudaeh
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Quote:
Originally Posted by ImprezaRallystyle
not that i want to argu with you roger but at my local subaru dealer, my mecanic did over 75 motor job last year and he never replace the head bolt by new one.

Even in my race car he put back the original head bolt.
good enough for me
thanx
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Old 06-30-2005, 01:42 PM   #5
EcksJay
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I didn't replace them when I did the head job on a 2001 2.5 engine. That was well over 5k ago. No problems as of yet. If you do a search, you'll find reports of people re-using the bolts as much as 7 times! with no problems, I might add.
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Old 06-30-2005, 04:41 PM   #6
Storm
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Subaru doesn't use torque-to-yeild bolts for the heads.

You may reuse them...

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Old 06-30-2005, 09:12 PM   #7
Tim Sanderson
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Ya, I was looking at my fsm after I read this this morning and normally if a piece or part needs to be replaced it will have a black star next to it. The head bolts did not have this black star so I would have to agree that they do not need to be replaced.

My fsm's are for 2000 model year impreza.
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Old 07-01-2005, 12:10 PM   #8
John2.5RS
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Exclamation They do to use tq to yield bolts.

I've worked as a tech for an auto dealership. All dealership techs are NOT master techs. I've seen a tech w/ 20+ yrs. exp. put a headgasket on backwards. They are not that expensive seeing that you spent WAY too much for all those gaskets. I rebuilt an entire ej25 motor and didn't spend over $100 for all the gaskets, seals, and new head bolts.
Just get new bolts, It can't hurt in the long run.
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Old 07-01-2005, 12:40 PM   #9
Matt Monson
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Don't waste your money on headbolts. Reusing them is totally fine. I have reused them on every EJ engine I have ever put back together (5 in the last year) with no problems. Give a call to Cobb, and they will tell you the same thing. As has been mentioned, just because a guy is a tech or even a master tech, doesn't mean that he is an expert, especially if he is a GM tech working on a Subaru. Storm has it right...
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