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Dmax topend knock

Discussion in 'Chevy Trucks' started by mule585, Nov 18, 2015.

  1. mule585

    mule585 Member
    Messages: 74

    Hey guys. My dmax started to knock/tick over the weekend. Has 167k on it. Changed the oil 2 weeks ago (Rotella t6) and put a new cat fuel filter on it yesterday. Any ideas on what it could be and what it might consists of to fix of said ideas? I have a video to post if I can figure out how
     
  2. bmc1025

    bmc1025 Member
    Messages: 36

    What year? Is it an lb7?
     
  3. Triple L

    Triple L PlowSite Fanatic
    from Canada
    Messages: 5,988

    The typewriter sound is common and nothing to worry about, just a small air pocket in the oil... Google it and you'll find ton of info but no need to worry
     
  4. lilweeds

    lilweeds PlowSite.com Addict
    Messages: 1,178

    Injector knock? Mine was doing that last year, an injector balance check will tell. If it's an LBZ or new they are relatively easy to replace individually.
     
  5. Philbilly2

    Philbilly2 2000 Club Member
    Messages: 2,633

    2nd that or weak CP3 could be an additional thing to look into.

    Balance rate check with a tech 2 is the only true way to check injectors and or load the cp3 to see if that is it.

    What is the year?
     
  6. leolkfrm

    leolkfrm PlowSite.com Addict
    Messages: 1,430

    might not like the synthetic oil, i know cats dont...i use mobil 15w40 in my lb7
     
  7. mule585

    mule585 Member
    Messages: 74

    It is an 05 lly. Turns out it was the #7 & #8 injectors. 7 was 4% over and 8 was 3.5% over. Had them replaced tuesday. Don't know if I'm over thinking but I feel like there is still a slight knock.
     
  8. snowman55

    snowman55 PlowSite.com Addict
    Messages: 1,071

    Burn some tranny fluid in fuel. Shut my 07 up.
    Injectors want a little lube.
     
  9. SnoFarmer

    SnoFarmer PlowSite Fanatic
    from N,E. MN
    Messages: 8,584

    atf actually lowers the lubricity of diesel fuel.

    ". According to the U.S. Army's quarterly fuel and lubricant bulletin (March 1994), laboratory testing using the Ball-on-cylinder lubricity evaluation (BOCLE) had shown that the addition of ATF to a low sulfur fuel does not improve the fuel's lubricity rating. Moreover, the presence of ATF in fuel can adversely affect other performance properties of diesel fuel."
     
  10. snowman55

    snowman55 PlowSite.com Addict
    Messages: 1,071

    Maybe according to army. But not my experience. Then again wtf do I know I' m just the lawn boy.
     
  11. SnoFarmer

    SnoFarmer PlowSite Fanatic
    from N,E. MN
    Messages: 8,584

    It's like saying, why smoke filtered cigs, we always smoked unfiltered.

    Just because isn't a reason.;)

    There are better and safer products to use to free up sticking injectors.
    I don't know, like a product made for it?

    Atf got its start as whale oil it worked great for cleaning and lubing things up.
    Sure it will still clean, but it is now more aberasive, it leavs deposits all of its own, ant it's formulated to with stand higher temps.


    Fyi
     
  12. Mr.Markus

    Mr.Markus PlowSite Fanatic
    Messages: 5,174

  13. Randall Ave

    Randall Ave 2000 Club Member
    Messages: 2,010

    With a good scanner you should be able to do cylinder cut outs. Where were the rest of them at?