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nxs 625 ACERT problems

Discussion in 'Trucks [ Eighteen Wheelers ]' started by frankie f, Oct 2, 2010.

Page 2 of 3
  1. Oct 3, 2010 #11
    vinnie_

    vinnie_ Bobtail Member

    25
    1
    Oct 2, 2010
    nh
    0
    il bet your water fuel seperater filter casting has a hair line crack and it sucking a tiny bit of air...
     
    vinnie_, Oct 3, 2010
    vinnie_, Oct 3, 2010
    #11
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  3. Oct 3, 2010 #12
    frankie f

    frankie f Bobtail Member

    12
    0
    Sep 7, 2009
    califon nj
    0
    checked in jan, replaced filter head, 12 injectors later same thing
     
    frankie f, Oct 3, 2010
    frankie f, Oct 3, 2010
    #12
  4. Oct 3, 2010 #13
    frankie f

    frankie f Bobtail Member

    12
    0
    Sep 7, 2009
    califon nj
    0
    i will check about injector lobes on cam,i have dual 100 gal tanks, try to keep
    them over 1/2 full ,have checked fuel temp -ok
    i have checked fuel return out of head for air but never for volume thanks
     
    frankie f, Oct 3, 2010
    frankie f, Oct 3, 2010
    #13
  5. Oct 18, 2010 #14
    frankie f

    frankie f Bobtail Member

    12
    0
    Sep 7, 2009
    califon nj
    0
    changed crank sensor today, more power, miss more pronounced
     
    frankie f, Oct 18, 2010
    frankie f, Oct 18, 2010
    #14
  7. Oct 19, 2010 #15
    Mr. Haney

    Mr. Haney Road Train Member

    2,693
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    Dec 17, 2008
    0
    You need to put the truck on a dyno and reproduce the problem under a load. CAT is having some bad rebuilt injector on the market and I'm wondering if you have had multiple injector problems. Also I ran across someone that had a restrited return fuel line that was restriting fuel flow considerably. The truck maintained good fuel pressure, but had low flow.........the injectors need flow also, as this acts as a coolant for the injector body. He was having injectors fail every 2-3000 miles
     
    Mr. Haney, Oct 19, 2010
    Mr. Haney, Oct 19, 2010
    #15
    frankie f Thanks this.
  8. Oct 24, 2010 #16
    frankie f

    frankie f Bobtail Member

    12
    0
    Sep 7, 2009
    califon nj
    0
    how much fuel should flow thru motor?
    changed check valve in sec fuel filter head -seems to help a lot, changed in feb. went bad in april, put old one back in ,(april).
    replaced transfer pump, put in new relief valve, pressure 105@ 1800 rpm
    i agree with bad injectors-they replaced 6 then they checked serial#s and said to replace #3
    took it to cat dist. they put it on dyno replaced#6,n.g.took it back they changed #1 &#2 ng, took it back yhey changed #4 &5 because they were only changed once. they said they could not duplicate problem on dyno,
     
    frankie f, Oct 24, 2010
    frankie f, Oct 24, 2010
    #16
  9. Oct 25, 2010 #17
    Mr. Haney

    Mr. Haney Road Train Member

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    Dec 17, 2008
    0
    Roughly 100 Gallons Per Hour for fuel flow through the engine. The engine at full load will burn 26-30 GPH depending on the power rating.
     
    Mr. Haney, Oct 25, 2010
    Mr. Haney, Oct 25, 2010
    #17
    frankie f Thanks this.
  10. Oct 28, 2010 #18
    underpsi

    underpsi Road Train Member

    1,266
    292
    Sep 18, 2008
    Toronto, Ont
    0
    How much do you think they will burn at idle (700rpm) and at high idle (1200rpm)?
     
    underpsi, Oct 28, 2010
    underpsi, Oct 28, 2010
    #18
  11. Oct 28, 2010 #19
    Mr. Haney

    Mr. Haney Road Train Member

    2,693
    2,041
    Dec 17, 2008
    0
    I think CAT says they'll burn .8 GPH at 700 RPM, but real world is around 1 GPH. At 1200 RPM...........I'm going to guess at about 1.5 GPH.

    If it's cold out and it needs to idle for heat.........1200 is were I'd idle it to maintain water temperature above 160 degrees
     
    Mr. Haney, Oct 28, 2010
    Mr. Haney, Oct 28, 2010
    #19
    underpsi Thanks this.
  12. Oct 28, 2010 #20
    underpsi

    underpsi Road Train Member

    1,266
    292
    Sep 18, 2008
    Toronto, Ont
    0
    I heard its better on everything to idle at 1200. We have all our trucks set at 1200 but don't let the guys idle very long, they got espar and webasto bunk heaters
     
    underpsi, Oct 28, 2010
    underpsi, Oct 28, 2010
    #20
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