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The 6.4 HD Hemi Thread

Discussion in 'Heavy Duty' started by nukeman, Dec 21, 2013.

  1. Fitz-0518

    Fitz-0518 Veteran 66-68 Military

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    Sanda, I have not finished my home work on what type of thermo electric fans choices we have. I do know they are available. Will share what I find when I get ready to order one. Need to also talk to my Tech to make sure that he is Ok with installing.
    Focused now on getting the exhaust leak fixed on my 2018 2500 FCA replacement truck #2. Have all the OEM MOPAR parts needed including headers. Having my Tech do the work. After 1 year of letting dealers try to fix truck #1, can't trust the dealers. Fitz
     
    Last edited: May 30, 2019
  2. sandawilliams

    sandawilliams Senior Member

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    Thanks for doing the research for us.
     
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  3. ETX Ram

    ETX Ram US NAVY VETERAN Military

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    Following this now Fitz. Interested to know how you come out with electric fan project.
    Lee
     
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  4. Fitz-0518

    Fitz-0518 Veteran 66-68 Military

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    Sanda, Lee, I believe I have gotten to the bottom of what we need to know about our fan noise. This is what I learned.
    1. Most of the high heat fan noise comes from our thermal fan clutch. When replacing this part, it should be ordered by VIN #. The aftermarket fan clutches are designed to be used on many different applications. They are often designed to activate/engage at a lower temp than what the OEM clutch would engage at. On my 03 5.7. The activate temp by Vin # is 150*. When I replaced my radiator, pump and fan clutch my tech was not able to locate a OEM clutch. He installed a Dorman that came on at 120*. I have since located an new old stock fan clutch from a dealer in Kentucky. The 120 temp clutch was coming on too often and staying on to long.
    2. Now to the electric high heat fans. I replaced the one on my 03 a couple years ago with a application specific VDO fan. Perfect results, No issue.
    On the 2018 6.4 I have learned that the electric fans were not spec'd for noise. As a result the parts vendor is producing a unusually noisy fan when it engages. Dealers are telling customers who notice this, normal and customary. My tech is looking for a direct replacement fan that would be as effective but quieter. Nothing yet. Fitz
     
  5. NewBlackDak

    NewBlackDak Senior Member

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    79126K miles, and I have an exhaust leak at the rear of the driver side manifold. Currently it goes away when everything heats up. Anyone else seen this on a 6.4L?


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  6. Fitz-0518

    Fitz-0518 Veteran 66-68 Military

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    Common on "some" 2500 6.4 engines. Assembly defect per dealers and FCA. When the tightening sequence is not followed or the torque specs are not followed, we get an exhaust leak. My first 2018 6.4 was replaced by FCA for this problem. The replacement came in and it has the same exhaust leak. Only heard on cold start. Screech/hiss sound. The rear exhaust manifold bolts on the driver and passenger side are the bolts that most often snap from the expansion contraction.
    My POV, FCA has now adopted a Fiat, Renault mentality. Design and make them cheap, throw them together and focus on the bank deposits.
     
  7. NewBlackDak

    NewBlackDak Senior Member

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    Screech/hiss is a perfect explanation for it, and only on cold start. Maybe I can convince the wife now that I “need” headers.

    On a side note. Might as well change plugs at the same time. Should be much easier with the manifolds out of the way.

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    Last edited: Jul 11, 2019
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  8. ETX Ram

    ETX Ram US NAVY VETERAN Military

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    Fitz - Appreciate the info and the associated followup. I'm going to continue following along. My fan doesn't appear to be noisy as of yet - 6.4L 2500, but always keeping a tuned ear out for this as well as any Hemi tick or exhaust noise.
    Lee
     
  9. Canadian Mopar

    Canadian Mopar Member

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    Update on my search, found a good deal on a used 2017 2500 6.4L. Already has a K&N CAI. The PO also took out the resonator so it sounds pretty awesome!
    Already noticed quite a bit of difference from the 2011 2500 5.7L in the drive home, see how it does with a load.

    WP_20190722_21_10_59_Rich_LI.jpg
     
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  10. a_tack

    a_tack Junior Member

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    Nothing special. My 2018 Tradesman.
    [​IMG]


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