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cat bad chatter at idle miss under load

Discussion in 'Trucks [ Eighteen Wheelers ]' started by little cat 500, Oct 9, 2010.

Page 1 of 6
  1. Oct 9, 2010 #1
    little cat 500

    little cat 500 Road Train Member

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    had a bad o ring on #5 injector so had shop put all 6 injectors in ran great for maybe 800 miles then started to miss again and chatter bad when idleing filters/fuel lines are new i buy all my fuel at the same place overhead is set right 6nz 435/500 cat kinda stumped here
     
    little cat 500, Oct 9, 2010
    little cat 500, Oct 9, 2010
    #1
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  3. Oct 9, 2010 #2
    country29

    country29 Medium Load Member

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    I would get a cylinder cutout test ran at a good shop, since all 6 inj are new, if the cutout test shows 1 cylinder lower than the other, you have a leaking head gasket at that cylinder. that would be where I would start, some of the other guys here may have a better approach but that would be where I started if it hasn't had a head gasket in a while. have seen leaking head gaskets do crazy things before on them yellow motors. just my .02
     
    country29, Oct 9, 2010
    country29, Oct 9, 2010
    #2
  4. Oct 9, 2010 #3
    little cat 500

    little cat 500 Road Train Member

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    i took it back and they did a cut out and say every thing is fine but this thing sounds like heck and bucks bad around 1300 sometimes as high as 1500 rpm maybe some one else will ring in with an idea
     
    little cat 500, Oct 9, 2010
    little cat 500, Oct 9, 2010
    #3
  5. Oct 9, 2010 #4
    Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    Are any codes coming up ? :biggrin_2558:
     
    Diesel Dave, Oct 9, 2010
    Diesel Dave, Oct 9, 2010
    #4
  7. Oct 10, 2010 #5
    little cat 500

    little cat 500 Road Train Member

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    no codes coming up wish it was maybe id have so idea this mtor has alot of miles on it like 928 never been apart other than the rack uses no oil or water
     
    little cat 500, Oct 10, 2010
    little cat 500, Oct 10, 2010
    #5
  8. Oct 10, 2010 #6
    Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    Here's a long shot, and guessing, VIBRATE DAMPNER, (BALANCER) in front of the crank.
     
    Diesel Dave, Oct 10, 2010
    Diesel Dave, Oct 10, 2010
    #6
  9. Oct 10, 2010 #7
    little cat 500

    little cat 500 Road Train Member

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    ok but would the balancer make the motor sound chattery
     
    little cat 500, Oct 10, 2010
    little cat 500, Oct 10, 2010
    #7
  10. Oct 10, 2010 #8
    Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    By chatter you mean like diesel knock ? If thats the cause, then its starving for fuel some where .
     
    Diesel Dave, Oct 10, 2010
    Diesel Dave, Oct 10, 2010
    #8
  11. Oct 10, 2010 #9
    Espressolane

    Espressolane Road Train Member

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    Sounds like it's going too lean.

    pressure test the intake system from the output of the turbo to the intake manifold.
     
    Espressolane, Oct 10, 2010
    Espressolane, Oct 10, 2010
    #9
  12. Oct 10, 2010 #10
    little cat 500

    little cat 500 Road Train Member

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    yea the chatter i mean not a fuel knock just very noisy pn the over head kinda sound i know its not going to be quiet like a gas moter but this motor was never this loud nothing broke in the over head and every thing is moveing fine just clattery if thats a word lol
     
    little cat 500, Oct 10, 2010
    little cat 500, Oct 10, 2010
    #10
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