Quick Question: Head Bolts: Reinstall Dry, Oil, or AntiSeize

Discussion in '40- & 55-Series Tech' started by GreenFJ40, Jul 19, 2005.

  1. GreenFJ40

    GreenFJ40

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    When reinstalling my headbolts, should I use a light film of oil, antiseize or just torque them down dry?
    TIA!
     
  2. trainrech

    trainrech

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    I suggest anti-seize.
     
  3. woody

    woody unhelpful spotter Staff Member Admin

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    dry

    any fluids or antisieze compounds will effect accurate torque readings and should be avoided.
     
  4. Pinion

    Pinion

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    I think the FSM says to use a light coat of oil. I used blue thread locker.
     
  5. Mace

    Mace rock scientist.. Staff Member s-Moderator

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    I would think that Antisieze would help you get a more accurate torque measurment.

    Interesting.
     
  6. ranger

    ranger

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    Chase the threads in the block, wire brush the threads on the bolts, then apply a light film of oil to the head bolt threads.
     
  7. woody

    woody unhelpful spotter Staff Member Admin

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    nuts...I'm getting outvoted....lol...

    anyone have the FSM in front of them to tell me I'm wrong? lol
     
  8. andrewfarmer

    andrewfarmer

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    oil. also apply it to the washer.
    Sorry woody - it's standard practice on almost every vehicle I've ever worked on!
     
  9. FLFJ40

    FLFJ40

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    Woody's right, all torque values are for dry bolts, lubricaint will change your actual torque value, up to 10% in some cases. The FSM for the F does not say anything about lube.
     
  10. snailwagon

    snailwagon

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    There is a good tech trivia thing on pirate covering this right now.
     
  11. CruisinTiger

    CruisinTiger

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    just my 2 cents, but wouldn't antisieze help you take the bolts out the next time?
     
  12. Poser

    Poser Oh...Durka Durka Durka. s-Moderator Supporting Vendor

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    FSM says oil the threads.


    What I have done on all engines that I have ever worked on.


    :beer:


    -Steve
     
  13. honk

    honk

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    Light oil them. You don't want any dry resistance creating a false torque reading, especially on head bolts.
     
  14. JJB77FJ40

    JJB77FJ40

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    I have torqued 100% of every single of the only 15 (or was it 13) headbolts on the only engine I have ever rebuilt or taken apart (my 2F) w/Antiseize..............I hope I don't have any issues.

    I trust that puts this debate to rest.


    John
    Engine rebuilder(1) extraordinaire(sp?)
     
  15. 80fj40

    80fj40

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    I was always taught that "antisieze DOESN'T BELONG anywhere on an engine" by my shop foreman. I got in s*** for antisiezing engine bolts as an apprentice and just got into a habit of never using the stuff inside an engine. I was taught to thread-chase the threaded holes and wire wheel the bolts if needed and install dry.

    Although I do make exceptions (sometimes) and antisieze steel bolt goes into aluminum threaded holes.
     
  16. mudtoy67

    mudtoy67

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    I've always heard to use a light coat of oil.

    ARP actually says to use their special thread lube for any of their bolts to get a proper torque reading.
     
  17. Plowboy

    Plowboy

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    I've been doing engines for 40 yrs, and have never put any lube on a head bolt. Some holes will penetrate the water jacket, so, tap the block to clean up threads. and follow the torque sequence. If you know the engines has had the head off 3 or 4 times, replace the bolts with new.
     
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