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3406E misfire that won't go away, even after overhaul

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by JCMtrans, Jun 2, 2019.

Page 4 of 6
  1. Jun 9, 2019 #31
    lwlevens

    lwlevens Medium Load Member

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    Well see if that rocker is moving like it should be,if it is then I would follow what EverLuc said.
     
    lwlevens, Jun 9, 2019
    lwlevens, Jun 9, 2019
    #31
    Oxbow and JCMtrans Thank this.
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  3. Jun 9, 2019 #32
    JCMtrans

    JCMtrans Bobtail Member

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    Dec 29, 2016
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    I took a video of it a little bit ago running with the different ECM, here is the link:
     
    JCMtrans, Jun 9, 2019
    JCMtrans, Jun 9, 2019
    #32
  4. Jun 9, 2019 #33
    JCMtrans

    JCMtrans Bobtail Member

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    I'll pop the valve covers tomorrow, look at the cam lobes again, and dial indicator the travel. I can call Cat Tech tomorrow and get the lift specs I should see on the indicator, but does anyone know off the top of their head? As of a couple weeks ago, no visible signs of wear. The cam/rockers have to be the culprit, it's had (2) injector harnesses in the last couple years, the most recent being a month ago, the engine harness is new as of overhaul... All the postings I've read about camshaft issues involve obvious signs of wear, i.e. a rocker visibly not moving as much as the rest, signs of wear on the lobe, dropped rocker roller....etc. Mine has none of this. I can bet though that the rockers have never had new bushings, even though they don't have any flop or play that I can feel between them and the rocker shafts. I will also put in a new cam sensor and see if that does anything.
     
    JCMtrans, Jun 9, 2019
    JCMtrans, Jun 9, 2019
    #33
  5. Jun 9, 2019 #34
    EverLuc

    EverLuc Light Load Member

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    Where is the misfire in the video? It seems like it is on high idle.
     
    EverLuc, Jun 9, 2019
    EverLuc, Jun 9, 2019
    #34
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  7. Jun 9, 2019 #35
    JCMtrans

    JCMtrans Bobtail Member

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    Did you have any bubbles in your fuel? How did they track the problem down? Was it isolated to one cylinder or did you have a misfire that was generalized to all cylinders? Thanks for the help everyone!!
     
    JCMtrans, Jun 9, 2019
    JCMtrans, Jun 9, 2019
    #35
  8. Jun 9, 2019 #36
    JCMtrans

    JCMtrans Bobtail Member

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    Dec 29, 2016
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    JCMtrans, Jun 9, 2019
    JCMtrans, Jun 9, 2019
    #36
  9. Jun 9, 2019 #37
    JCMtrans

    JCMtrans Bobtail Member

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    I don't know how my reply showed up as someone else's. I really don't... The above is me replying to Everluc..... Above is also a photo of the 4 cylinder automated test results that showed #3 as not ok...until now the automated tests didn't show much except low readings for #3. This is the first test I've done where the automated tests have actually caught it.
     
    JCMtrans, Jun 9, 2019
    JCMtrans, Jun 9, 2019
    #37
  10. Jun 10, 2019 #38
    Troy_

    Troy_ Road Train Member

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    they didn't track it down to a specific cylinder like in your case, Truck309 mentioned there was a bad run of reman injectors in 2012 and we talked Finning (the Caterpillar guys up here) into replacing them after they admitted there was in fact issues with some injectors. the tech that came to our shop to replace them discovered that every injector had burn marks past the tips from blowby and inspected the seats with a borescope. all of them were badly leaking past the tips and Finning agreed to replace the head. a poster here on Truck309's thread, truckmachinist I believe it was, said from the start it was injector seats, in my case he was bang on. he had built his own tool to re-grind the seats after he found out this was an issue on other trucks with the exact symptoms my truck had.
     
    Troy_, Jun 10, 2019
    Troy_, Jun 10, 2019
    #38
    spsauerland and JCMtrans Thank this.
  11. Jun 10, 2019 #39
    spsauerland

    spsauerland Road Train Member

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    West Harrison, In
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    Another easy thing to rule out would be hanging Jake brake. Would need shorter bolts or spacers and run with Jake housing off. Does it have 340A Jake's? Those are pretty sensitive to over adjustment and need to wait for the oil to completely purge.
     
    spsauerland, Jun 10, 2019
    spsauerland, Jun 10, 2019
    #39
    idahoheavyhaul, Oxbow, JCMtrans and 1 other person Thank this.
  12. Jun 10, 2019 #40
    swaan

    swaan Road Train Member

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    BC canada
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    This^^^^^^^^
    A lot people when doing the overhead dont purge the oil out of Jake slave when doing the adjusters. Recommended procedure is to screw the auto lash adjuster down so there is valve spring pressure pushing on the slave to purge the oil. Then back out and make your adjustments.
    Theres been many exhaust rockers broke off because of wrong lash setting.
     
    swaan, Jun 10, 2019
    swaan, Jun 10, 2019
    #40
    Wheeljack, Oxbow, JCMtrans and 1 other person Thank this.
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