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Old 05-21-2021, 11:08 PM   #1
serfma
 
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Question Head bolts re-usable? (KA24E)

I have a second Nissan that has been sitting a while, only thing I know from my brother is that the water pump belt broke and it overheated. Trying to figure out if I should re-use head bolts or toss 'em? I'm sure with overheating and it being enough to blow white smoke out the pipe that head bolts need replacing + gasket + head decked but didn't know on these motors as I hear people sending it as is only replacing the gasket and being fine.

Another thing, is it that important to loosen head bolts 1/4 a turn or should I just remove them in order with a ratchet/impact and be just fine?

TIA!
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Old 05-21-2021, 11:34 PM   #2
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may have stretched em, I would go new, one less worry
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Old 05-22-2021, 12:05 AM   #3
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Quote:
Originally Posted by serfma View Post
I have a second Nissan that has been sitting a while, only thing I know from my brother is that the water pump belt broke and it overheated. Trying to figure out if I should re-use head bolts or toss 'em? I'm sure with overheating and it being enough to blow white smoke out the pipe that head bolts need replacing + gasket + head decked but didn't know on these motors as I hear people sending it as is only replacing the gasket and being fine.

Another thing, is it that important to loosen head bolts 1/4 a turn or should I just remove them in order with a ratchet/impact and be just fine?

TIA!
Re-using head bolts is always a crap shoot. They stretch when you install them. They are not really meant to be re-used. Most of the time you can re-use them and nothing happens.

And sometimes they don't work and the gasket blows down the road somewhere. I never take a chance. I always start with new bolts. It's a crap shoot where the odds are in your favor. But sometimes even when the odds favor you...things don't work out.
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Old 05-22-2021, 12:42 AM   #4
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Don't reuse.
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Old 05-22-2021, 02:31 AM   #5
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They are torque to yield bolts, they must be replaced.
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Old 05-22-2021, 02:59 AM   #6
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Replace. Replace. Replace!

NEVER re-use head bolts. As the guys above said..."They stretch when torque is applied". That's what torque is...stretching the bolt to get the correct clamping pressure.
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Old 05-22-2021, 06:44 AM   #7
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Replace. Replace. Replace!

NEVER re-use head bolts. As the guys above said..."They stretch when torque is applied". That's what torque is...stretching the bolt to get the correct clamping pressure.
What PorknBeans said. I have reused head bolts, but only in desperation back in the 80's when I was flat broke a couple of times. I always knew I was taking a big chance. I did it on a 78 Toyota truck engine once...and the gasket failed a short time later. PorknBeans was more to the point, and not as 'nice' about it as I was.

Reusing these bolts is sort of like pulling a nail from a board, and it gets bent a little bit...and then you try to pound it straight and use it again. Yeah...just buy some new head bolts. I think RockAuto dot com has them at a reasonable price.
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Old 05-23-2021, 01:00 AM   #8
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Quote:
Originally Posted by PorknBeans View Post
Replace. Replace. Replace!

NEVER re-use head bolts. As the guys above said..."They stretch when torque is applied". That's what torque is...stretching the bolt to get the correct clamping pressure.



this is technically incorrect. all bolts do stretch and their clamping force comes from the elasticity in the material. However, some are yielded (see a stress strain graph) and ours are supposed to be yielded to increase fatigue life. Honda's head bolts for example are reusable.
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Old 05-23-2021, 05:09 AM   #9
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Is reusing head bolts worth potential catastrophic damage?
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Old 05-23-2021, 11:29 AM   #10
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Reused bolts is probably why the head gasket blew on my burgandy 91. That and they lost the washers for 3 of the bolts as well. Shitty backyard dillweed work.
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