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detroit diesel 8v92 questions

Discussion in 'Peterbilt Forum' started by flc120, Oct 13, 2015.

Page 5 of 16
  1. Oct 17, 2015 #41
    flc120

    flc120 Heavy Load Member

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    well im heading over to check out the truck now, he added to batterys and got the truck to start but it will only run for a couple seconds then it cuts off?

    what could this be from? im on my way now to see if I can figure the problem. he says it has fuel and emergency cutoff isn't pulled out, so what else would make it just cut out?
     
    flc120, Oct 17, 2015
    flc120, Oct 17, 2015
    #41
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  3. Oct 17, 2015 #42
    damutt

    damutt Road Train Member

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    air in the lines. grab some fuel, openthe fuel filter fill it up and it SHOULD run longer. but make sure you check the rack FIRST
     
    damutt, Oct 17, 2015
    damutt, Oct 17, 2015
    #42
  4. Oct 17, 2015 #43
    201

    201 Road Train Member

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    high plains colorado
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    If you are using ether to start it, ( which you almost have to use on those) it runs, then dies, I'd bet the pump lost it's prime. I believe, an old Detroit pump won't prime itself ( actually suck the fuel out of the tank) and on the Detroits I dealt with, like the ones that ran out of fuel, I would pressurize the fuel tank, not a lot of air, just enough to get fuel to the pump,, and see if it stays running then.I feel your pain,,,,old Detroits (shiver):biggrin_25512:
     
    201, Oct 17, 2015
    201, Oct 17, 2015
    #43
  5. Oct 17, 2015 #44
    MACK E-6

    MACK E-6 Moderator Staff Member

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    Yep, prime the fuel system and see what happens.

    And where's the pictures?:)
     
    MACK E-6, Oct 17, 2015
    MACK E-6, Oct 17, 2015
    #44
    201 Thanks this.
  7. Oct 17, 2015 #45
    flc120

    flc120 Heavy Load Member

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    Jul 11, 2012
    Miami,FL (yeah i know :( )
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    I went and checked out truck how on earth would i be able to prime the fuel tank? Thru the vent fitting on tank?

    When i get it running with the ether it will only run on the ether, you can tell its not pulling fuel. We pulled off the fuel filter and it was about 3/4 of the way full.

    Also on the dash theres a lil t handle looking choke im guessing wen you pull and push it im not sure which way its supposed to be in or out so that engine can run cable goes to same box looking thing which throttle linkage goes to so im guessing its a cutoff of somesort.


    How do i get this thing started
     
    flc120, Oct 17, 2015
    flc120, Oct 17, 2015
    #45
  8. Oct 17, 2015 #46
    mountaingote

    mountaingote Road Train Member

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    That's probably a compression release. It has to be all the way in for the truck to start. If you get it running, try turning off the key. If it keeps running pull out the handle and see if it stops. If so, there's yer answer. It could also be a manual throttle control. Step an the gas and pull it out it should keep the engine at that speed.
     
    mountaingote, Oct 17, 2015
    mountaingote, Oct 17, 2015
    #46
  9. Oct 17, 2015 #47
    goin2fast10

    goin2fast10 Medium Load Member

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    Make sure both filters are completely full before trying to crank it.

    Prime the system. Without a priming pump it will take a long, long time. All the air has to be out of it. To pressurize the fuel tank you have to use air pressure applied at the vent, and crack the line at BOTH filters until fuel comes out, one filter at a time, starting with the primary then moving to the secondary. The primary should be the closest to the tank.
    The chrome knob on the dash could be (probably is) the "manual cruise control" which just more or less keeps the throttle in place.
    The "Emergency Shutoff" usually has red around it somewhere, but with either one it needs to be pushed in.
    On the blower there is a 'lever' that is used to re-set the Emergency Shutoff. It has a 'cam' mechanism easily identified and easy to see when it's re-set. But, if it were pulled you'd be getting a lot of black smoke, UNLESS you aren't getting any fuel, which is probably the problem.
     
    goin2fast10, Oct 17, 2015
    goin2fast10, Oct 17, 2015
    #47
    truckdad and MACK E-6 Thank this.
  10. Oct 17, 2015 #48
    goin2fast10

    goin2fast10 Medium Load Member

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    They don't have a compression release.
     
    goin2fast10, Oct 17, 2015
    goin2fast10, Oct 17, 2015
    #48
    truckdad and Bean Jr. Thank this.
  11. Oct 17, 2015 #49
    mountaingote

    mountaingote Road Train Member

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    Sez who? I'm just trying to help. I've seen plenty of trucks with compression release setups.
     
    mountaingote, Oct 17, 2015
    mountaingote, Oct 17, 2015
    #49
  12. Oct 17, 2015 #50
    goin2fast10

    goin2fast10 Medium Load Member

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    Sez me. I spent most of my adult life working with them.
     
    goin2fast10, Oct 17, 2015
    goin2fast10, Oct 17, 2015
    #50
    Bean Jr., FinkPloyd and truckon Thank this.
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