Torque to yield head bolts

Discussion in 'Mechanic and Repair' started by djagusch, Mar 19, 2018.

  1. djagusch

    djagusch LawnSite Platinum Member
    from MN
    Messages: 4,401

    Just wondering in general are any manufacturers starting to use torque to yield head bolts? Meaning replace them after one use.

    Of any of the seasoned mechanics do you just replace all head bolts on jobs or just the torque to yield ones? Just wondering what the best practices are these days.
     
  2. bmc1025

    bmc1025 LawnSite Senior Member
    Messages: 545

    Almost all are torque to yield gas or diesel in the big 3. GM 6.0 and 5.3 have been reused many times over successfully even though they are TTY. I would not attempt this on a ford or chevy diesel though, I would not want to re-do a 30hr head job over a couple hundred $ in bolts. The GM Vortec motors I would re-use in my personal vehicles.
     
  3. t303

    t303 LawnSite Member
    Messages: 8

    I reckon replace, but some manuals will have a limit measured at the shank of the bolt to give an indication of serviceability, obviously if the bolt in narrower than std then it has likely stretched.
     
  4. dieselss

    dieselss LawnSite Silver Member
    from NWI....
    Messages: 2,208

    Ford's been using then for quite some time.
     

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