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Old 06-26-2021, 11:26am   #1
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Default When is it OK to re-use head bolts?

Replacing the head gasket on a 2.2 inline 4 cylinder Rodeo. I have trusted Haynes manuals for a long time. It says to create a cardboard template and place the head bolts in it so they go back in to the same location.

But...the gasket kits on line all say to replace the head bolts.

I have re-used head bolts on my older cars, but these bolts are torqued using torque angle specs and not actual torque so maybe that makes a difference.
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Old 06-26-2021, 11:59am   #2
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I changed a lot of head gaskets in my younger days, & never replaced the bolts. I think some, if not all, newer bolts are torque-to-yield, & shouldn't be reused.

I'm old, & this is just one of many things that have likely changed since I thought I knew everything...
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Old 06-26-2021, 12:25pm   #3
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IF they are stretch bolts you definitely don't re-use them.
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Old 06-26-2021, 12:42pm   #4
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Quote:
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IF they are stretch bolts you definitely don't re-use them.
This.

Buy ARP bolts to replace them, and you won't have to replace those.
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Old 06-26-2021, 12:47pm   #5
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Quote:
Originally Posted by aerovette View Post
Replacing the head gasket on a 2.2 inline 4 cylinder Rodeo. I have trusted Haynes manuals for a long time. It says to create a cardboard template and place the head bolts in it so they go back in to the same location.

But...the gasket kits on line all say to replace the head bolts.

I have re-used head bolts on my older cars, but these bolts are torqued using torque angle specs and not actual torque so maybe that makes a difference.
On a Redeo? I would reuse them as new bolts would cost more than its worth.
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Old 06-26-2021, 12:53pm   #6
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On a Redeo? I would reuse them as new bolts would cost more than its worth.


If he fills up the gas tank, he doubles the value of the car.
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Old 06-26-2021, 12:58pm   #7
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French used car salesman: but sir, it has fresh head bolts!
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Old 06-26-2021, 3:01pm   #8
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Quote:
Originally Posted by DJ_Critterus View Post
IF they are stretch bolts you definitely don't re-use them.
How can you tell?
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Old 06-26-2021, 3:11pm   #9
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Quote:
Originally Posted by aerovette View Post
How can you tell?
TTY bolts typically have a bulge just under the head of the bolt.

Name:  tty1.jpg
Views: 66
Size:  9.4 KB

Click image for larger version

Name:	tty2.jpg
Views:	3
Size:	73.3 KB
ID:	58371


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Old 06-26-2021, 4:58pm   #10
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Quote:
Originally Posted by Y2Kvert4me View Post
TTY bolts typically have a bulge just under the head of the bolt.

Attachment 58370

Attachment 58371


Thanks, I was wondering that, too.
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Old 06-26-2021, 6:06pm   #11
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Quote:
Originally Posted by aerovette View Post
How can you tell?
If the manual specifies tightening to a torque value then rotating the bolt x degrees, that is torque and turn (torque to yield) however the fastener is configured. Re-use and re-stretch will likely snap them. If it does not they certainly have less clamping force than when first installed.
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Old 06-26-2021, 7:18pm   #12
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Quote:
Originally Posted by DAB View Post
Barton Family used car salesman: but sir, it has fresh head bolts!
@UniqueDoug
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Old 06-27-2021, 11:10am   #13
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Quote:
Originally Posted by Y2Kvert4me View Post
TTY bolts typically have a bulge just under the head of the bolt.

Attachment 58370

Attachment 58371


I was today years old when I learned these bulges were not for aligning a part so it is centered on the holes.
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Old 06-27-2021, 11:12am   #14
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Quote:
Originally Posted by markids77 View Post
If the manual specifies tightening to a torque value then rotating the bolt x degrees, that is torque and turn (torque to yield) however the fastener is configured. Re-use and re-stretch will likely snap them. If it does not they certainly have less clamping force than when first installed.
Exactly my fear. I bought new bolts, so the job is on hold until they get here.

Torque is 18, 90 degrees, 90 degrees, 90 degrees.
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Old 06-27-2021, 11:46am   #15
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Quote:
Originally Posted by aerovette View Post
Exactly my fear. I bought new bolts, so the job is on hold until they get here.

Torque is 18, 90 degrees, 90 degrees, 90 degrees.
And it'll still be a blown up POS in a couple months.. Just with new head bolts.
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Old 06-27-2021, 12:12pm   #16
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Clean/tap/chase female threads...blow out to ensure no debris settled at bottom of threads to prevent accurate torqueing or TTY.
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