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Off Topic Off Topic - General non-Corvette related discussion. |
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06-26-2021, 11:26am | #1 | ||||||
Chief Electrician
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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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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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06-26-2021, 12:25pm | #3 |
Explosive Salami
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IF they are stretch bolts you definitely don't re-use them.
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06-26-2021, 12:42pm | #4 | ||||||
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06-26-2021, 12:47pm | #5 | |||||||
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06-26-2021, 12:53pm | #6 | ||||||
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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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06-26-2021, 3:01pm | #8 | ||||||
Chief Electrician
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06-26-2021, 3:11pm | #9 | ||||||
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06-26-2021, 4:58pm | #10 | |||||||
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06-26-2021, 6:06pm | #11 | ||||||
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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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06-26-2021, 7:18pm | #12 |
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06-27-2021, 11:10am | #13 | |||||||
Chief Electrician
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06-27-2021, 11:12am | #14 | |||||||
Chief Electrician
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Quote:
Torque is 18, 90 degrees, 90 degrees, 90 degrees. |
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06-27-2021, 11:46am | #15 | ||||||
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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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