Engine Knock

Discussion in 'Dodge Challenger SRT Hellcat' started by SRT707HC, Jun 16, 2016.

  1. SRT707HC

    SRT707HC Gold Member Hellcat Car Club

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    Just thought i would share with you all my first and hopefully last horrified experience.

    Monday I had the oil changed in my Hellcat, 2700 km (1677 miles?). Car is 3 months old, and I'm about to leave for vacation to the USA

    Tuesday I decide to go out for a cruise around town... whilst leaving the local beer store I accelerated to change lanes and felt a shudder and then heard the knocking noise. I pull over and shut the car off, checked the oil level (which was ok). Started the car back up, looked at the oil pressure (seemed to be ok). Limped the car home less than 3 miles.. Had the car towed to the dealer... they spent most of Wednesday trying to figure out the knocking noise.
    Dealer called Wednesday late afternoon to say that they had to bleed air out of the oil galleries and that now the engine knock is gone. They said that one of the lifters may have gotten an air pocket and that's what caused the engine knock..

    Has anyone else experienced this??
     
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  2. RDLSRT

    RDLSRT Silver Member

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    Never heard of that.
     
  3. SRT707HC

    SRT707HC Gold Member Hellcat Car Club

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    The dealer said the same thing, that's why I reached out to Hellcat Forum, see if anyone else has had the same issue.
     
  4. 392shaker

    392shaker Silver Member

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    What I have done in the past and currently do to my cat is do what is called "clear flood mode" you place the throttle to WOT and hit the start button. the engine will crank for about 15-20 second while this is happening monitor the oil pressure. it should climb. once it stops cranking start the car as you normally would. this will pre lube the engine without causing any unnecessary premature wear. This should also be done before you start the engine after you do a oil change and maybe priming the oil filter will lessen the time to build oil pressure.
     
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  5. Hellcatmichael

    Hellcatmichael SRT Hellcat Supporter Gold Supporting Member

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    What you talking about Willis? No really the car won't start if you try starting it WOT then after 15seconds it stops by itself or do you stop cranking it. I'll tell ya they say there's nothing new under the sun but you learn something new every day? What does WOT mean? That's to the floor right? I'm stupid so excuse me.
     
  6. Link

    Link Silver Member

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    WOT wide open throttle
     
  7. oilburner

    oilburner Gold Member

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    the hydraulic lifter has a plunger inside that the oil pressure keeps in place . sometimes that plunger can stick in the bore causing slop in the valve train giving that metallic knocking noise. use to get valve lifter noise a lot after installing a motor that sat unused for long time. oil filters should be filled an soaked in before install but most guys won`t take the time. it may never happen again. don`t worry unless it continues to be a problem. not that unusual. a little spec of crap could cause that plunger to stick, very close tolerance between plunger an lifter body.
     
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  8. CanHP

    CanHP Silver Member

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    Glad to hear that nothing was wrong, are you heading out on Friday?
     
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  9. Hellcatmichael

    Hellcatmichael SRT Hellcat Supporter Gold Supporting Member

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    So do you recommend doing the "clear flood mode " thingy ?
     
  10. 392shaker

    392shaker Silver Member

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    I do it once a week because i do not drive it every day so it has worked for me for many years. Once you build a few engine you will understand the importance of doing this. I did this when I work for GM on a many Corvette and CTS-V and never had any issues
     
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  11. oilburner

    oilburner Gold Member

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    if you fill filter let oil soak into the filter an fill again till it can`t absorb any more, pressure will be instant. then no need for clear flood mode.
     
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  12. SRT707HC

    SRT707HC Gold Member Hellcat Car Club

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    10-4 yea sir
     
  13. SRT707HC

    SRT707HC Gold Member Hellcat Car Club

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    I also have my 310T-310S and have done many engine rebuilds! I've had a few issues with lifters not filling with oil...
     
  14. Catless

    Catless Silver Member

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    To the original question. I have never heard of that on any engine "bleed the air out of the oil galleries". I wonder if they filled with the wrong oil say the standard 0W-20 and then changed to the required 0W-40. Or more likely they were cranking/testing it and the noise went just went away.
     
  15. SRT707HC

    SRT707HC Gold Member Hellcat Car Club

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    That's what I was thinking...I don't see any oil charged out on my warranty invoice..
     

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