What is an "overhead?"

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Powell-Peralta, Jan 14, 2008.

  1. Powell-Peralta

    Powell-Peralta Road Train Member

    Jul 17, 2007
  2. wallbanger

    wallbanger "Enemy of showers everywhere"

    If you mean overhead as in 'run an overhead' it refers to a bit of routine engine work: setting valve lash to the proper tolerances.

    And I'm no mechanic, so my terminology may not be right, but if Joe is lurking around he can explain it better.
  3. Burky

    Burky Road Train Member

    You have it right. it's the equal of setting the valves in a car's engine. You adjust all the various operating mechanism in the head, and it should be done about once a year for best performance and economy.
  4. d-man57

    d-man57 Light Load Member

    Nov 20, 2007
    I worked for a company years ago and personally put 490k on one truck since new, it had a 3406 cat in it. They took it down to McAllister's and had a overhead done on it at 400K, after telling the fella the miles on it and it had never had an overhead done on it since new, he shook his head and said I'll feel a big difference when i get it back, i never noticed a difference. On the truck i have now, i prefer to maintain it better than the way they did things. I talked to Kenworth in Indy and they said for a C-15 cat it'll run around $500 that included, running the valves, the jakes, and resetting fuel pressure. Seems like a lot of money for no more than they're doing, hard to lay out that kind of money for something you may not notice, but it shouldn't be neglected.
  5. MedicineMan

    MedicineMan Road Train Member

    Jan 13, 2007
    Woodville, TX
    Bring it to me. I'll do all that for $300
  6. Magnum1

    Magnum1 Medium Load Member

    Dec 13, 2010
    Give me your address and the phone number, I'll bring my isx to you.
  7. Shade Tree

    Shade Tree Light Load Member

    May 15, 2011
    Galloway Ohio
    The CAT dealer is charging you a flat rate price. It usually takes one to to hours depending on applicatioon and if it has ACERT stuff on top. I used to do them in 45 minutes with no problem. I am not sure their comment about setting fuel pressure. it is a grear driven pump and has one setting "max'. Maybe they are charging you to hook up a gauge and checking it.

    AUSSIE DAVE Road Train Member

    Feb 21, 2010
    OZ - Brisbane
    yep should only take 1 to 2 hours to set valves and injectors and jakes, but they (cummins cat and the like) like to charge lots for it??? dont know how they get away with ripping so many people off. I do my Cummins M11 in about 3 or 4 beers (1.5 to 2 hours)
  9. Pablo-UA

    Pablo-UA Road Train Member

    Oct 11, 2010
    Borispol, Ukraine
    3-4 beers.... you drink sloooowly

    1 beer for me is about 10 min....
  10. Pablo-UA

    Pablo-UA Road Train Member

    Oct 11, 2010
    Borispol, Ukraine
    it is the real dumping!
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