Can you reuse the head bolts if your changing the head? Its a 91 corolla 1.6. Should I reuse the ones on my old head or the ones off the new used head from a junkyard? Or what should I do about this?
Can you reuse the head bolts if your changing the head? Its a 91 corolla 1.6. Should I reuse the ones on my old head or the ones off the new used head from a junkyard? Or what should I do about this?
I don't know Toyota's but I just changed the head gaskets on my 97 gmc. I know from that, that if the specs say to tighten too x amount of ftlbs and then x degrees more than that means they stretch. This is also called "Torque to Yield" If they do this than do not reuse you wouldn't get the proper tension across the head and it would probably leak.
If You Do Decied To Reuse Your Head Bolts Or A Junkyard Bolt, Tips On Finding A Good Set Is, 1 - Get Then Out Of A Recked Car( A Car With No Body Damage Is A Good Sign Of Engine Problem)2- Take Them Out Of The Same Engine Less Miles Then Yours. 3 - You Can Just Buy The Oem Head Bolts.
The non-OEM headbolts I just looked up at Rockauto were $33.79.
One thing I'd recommend either way is getting one extra head bolt and filing a couple vertical grooves down the threads and use that as a thread cleaner.
To be honest, with an engine this low powered and cheap, I'd just reuse the old head bolts.
Well, I reused them and I have coolant bubbling in my resevoir. I used a new head gasket, the old one looked fine but i still used a new one. i was thinking either i shouldn't have used the old ones and have caused warpage, or there is air in the cooling system, since i did have to change the radiator and removed all coolant hoses upon changing the head.
Quote:
Originally Posted by heartdisease
they were only $10 a box for my GMC
Why chance wasting all your time?
Where can I get a set for mine?
Quote:
Originally Posted by Flashmn
1st gen headbolts are reusable, they only tighten to torque specs (eg. 20nm, 40nm, 60nm).
2nd gen headbolts are non-reusable, they tighten to torque and then degrees, which stretches them (eg, 20nm, 40nm, 90deg, 90deg)
I'd rather just pick up a tap, rather than doing something weird with the bolt and f'n up the threads in the block.
A tap will mess up the threads much worse than my idea. Taps are designed to cut new threads, not clean existing ones.
If you cut vertical grooves (or grind flat a face of the threads) in an existing bolt, you maintain the exact same thread profile but add empty areas that can collect scraped gunk. Run this bolt into the threads a few times and blow it out with compressed air -- clean bolt hole.
I don't know what year your car is. These are for a 1990 corolla. I used a bottoming tap on my gmc. It was about 4 dollars online. Noprob. After i was done with my gmc i put the front on jack stands and ran it with the radiator cap off. After waiting for it to cool and then doing it again i've had no problems.
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