3406b questions

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by W923, Apr 17, 2024.

  1. W923

    W923 Road Train Member

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    I am resealing a good running b model with 650k miles (to the best of my knowledge). As I have taken things apart I don’t believe it’s ever been into at all.
    Couple things I have noticed that I don’t like
    When I turned the engine over to work on replacing bearings diesel fuel ran out of the injector retainers…I wouldn’t think this is normal. I have seen it run for roughly an hour…it’s out of a wrecked truck. In this time it didn’t seem to have an oil dilution problem. I don’t know about before because the oil pan was broken enough to let it leak out. No evidence of fuel dilution on the bearings or anything else so far.
    I assume there’s some type of improved screw for the rocker arms that actuate the Jakes…maybe someone knows the pn?
    IMG_6321.jpeg IMG_6322.jpeg
    @wore out @Last Call
     
    MACK E-6 Thanks this.
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  3. Last Call

    Last Call Road Train Member

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    Your right that’s not normal.. what is the prefix on the motor ? Can I ask what your’s your plans for this motor ?
    I can’t get into my SIS program right at the moment to look for a updated screw but @wore I bet knows the PN off the top of his head
    Are you just rolling bearings in it and calling it good ? or do you have plans for doing more ?
    I was wondering if you were going to do anything to the fuel system like changing the nozzles and doing some pump work .
    I know you well enough to know your pretty thorough about what your doing ,the cracked pan did you check the block close for any signs of stress from the accident ? I know that question isn’t related to the issue your asking about I was just asking outa of Curiosity more than anything
    If it was me I would probably put new nozzles in regardless which if yu did that then I would also do some pump work and now we’re talking about spending a fair amount of money that’s the reasons I asked you those questions
     
    MACK E-6, mile marker 27 and W923 Thank this.
  4. W923

    W923 Road Train Member

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    It’s a 3zj but has the wrong pump I think…memory says it’s a 7e5888. I was originally going to just roll a set of bearings and run it, it’s very clean inside. It’s going in a relatively low value truck of mine that runs mostly local but the more I thought about it, the more I didn’t want it to leak a bunch of oil so I decided to basically strip it to a short block and then rebuild from that point (pretty much just gasket and seals)
    I was going to let the fuel system alone, it starts and runs nicely. Not sure now because of the diesel fuel issue
    As far as damage from an accident, it had some minor damage to the passenger side of the cab but was driven to the salvage yard. The pan damage came from someone there picking it up with a loader. I am very good friends with the owner of the yard…. I have no doubts about the truth of this…he also says he drove it and seemed to be quite strong.
    also guessing the intercooler boots didn’t get double clamped because someone was board one weekend!
     
  5. Last Call

    Last Call Road Train Member

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    It sounds like you found yourself a good motor and from what you told me I would done basically just what you are doing . We both know just like you said that somebody didn’t double clamp the ATA boots just for something to do for the fun of it and we both know that’s a pretty good indication that someone has fondled the with turbo which most likely in unison with the fuel system. That said if it seemed as strong as what you were told a guy almost doesn’t want to spend money going through the fuel system or at least I wouldn’t consider it .
    All that said .. this is what I would consider doing if it was me I would pull the nozzles and have them tested and make sure they were working correctly
    I myself know just enough about the pumps to dangerous and there is a 50/50 chance of me giving you some bad advise If I have pump issues I always just pull them and take them to a older guy that knows those pumps like the back of his hand and just let him work his magic. He is also who I use to test my nozzles.. What I do know about pumps I have learned from him
    What I’am getting at is if your nozzles test out fine then this issue is going to probably be in the pump
    I apologize for not being of much help and basically haven’t told you any more than what you already knew, but I hate to give you some bad advice ..But I would start with the nozzles
     
    mile marker 27 Thanks this.
  6. wore out

    wore out Numbered Classic

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    CHASIN THE DEVIL'S HERD
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    You’re gonna #### when I tell you price of just that screw is a hundred and some bucks at CAT in Springfield. But you are definitely flirting with disaster right there.

    P12810 is the PAC brake number. You’ll have better luck googling jacobs or pac brake for your part numbers on the jake stuff. It’s noticeably cheaper to at like TAG or MHC as well
     
  7. W923

    W923 Road Train Member

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    Thanks
    Yes they need replaced for sure they are loosing pieces and going to make setting valves difficult for sure.
     
  8. broke down plumber

    broke down plumber Road Train Member

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    100+$$ for a dam screw , tungsten alloy , plated with platinum i hope .
     
  9. wore out

    wore out Numbered Classic

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    CHASIN THE DEVIL'S HERD
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    The correct screws use a rounded head on the exhaust valve with a 1/2 head. The original were never meant to be used with a Jake. Not a real big deal other than tells me the Jake was added to that motor after it left the factory.

    All 3ZJ’s used the 7E-5888 pump but pump cams were 11.5, 10.4, and 9.5 depending on serial number.
     
    MACK E-6, mile marker 27 and W923 Thank this.
  10. W923

    W923 Road Train Member

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    I have a 10.4 pump cam for what that might be worth
    Don’t know if you saw my other question about some diesel fuel in the injector retainers that ran out when I turned it upside down to work on the bottom end.
    Any thoughts as to why there’s fuel where it seems there should be oil?
     
    mile marker 27 and wore out Thank this.
  11. wore out

    wore out Numbered Classic

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    Anytime you have diesel in those retainers it’s nozzle time in my experience. You can look at the bleed screw and seal but usually they are leaking where the top part screws in to the nozzle.

    I use a pass through connector with a fine threaded nut, a head bolt and a wrist pin for a nozzle puller. The small end of pass through threads right into nozzle. A long barrel nut onto big end the head bolt and wrist pin. If you don’t have one rigged up already
     
    MACK E-6, mile marker 27 and W923 Thank this.
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