3406b fuel transfer pump install

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by nerv, Apr 13, 2022.

  1. nerv

    nerv Bobtail Member

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    Feb 10, 2022
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    Hello, I need some help cant seem to find any info, ive removed the fuel transfer pump on my 4mg 3406b and fitted the new one with the hose connections, i went to go install it and i cant seem to fit it back into the camshaft?, is there something that im missing? How does it fit back into place? I tried putting the old one back in place and it wont fully go in enough to be bolted back either.
     
    Oxbow Thanks this.
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  3. Oxbow

    Oxbow Road Train Member

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    I think you are probably just trying to compress the plunger.
     
    Roger McG and little cat 500 Thank this.
  4. nerv

    nerv Bobtail Member

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    What do you mean by trying to compress the plunger? When i put it back into the injection pump it wont go in all the way, not enough for me to be able to even thread the bolts.. what do i need to do?
     
    Oxbow Thanks this.
  5. nerv

    nerv Bobtail Member

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    Where does the plunger need to sit?
     
  6. Oxbow

    Oxbow Road Train Member

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    The plunger rides against a cam that pushes it in, and a spring inside the pump pushes it back out to complete the pump stroke. I think you just need to keep it more or less centered and push it in to compress the spring, and then start the bolts.
     
    Roger McG and spsauerland Thank this.
  7. nerv

    nerv Bobtail Member

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    Ok, i got it now, im suppose to compress the plunger… kill me now haha
     
    Roger McG and Oxbow Thank this.
  8. nerv

    nerv Bobtail Member

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    Thank you, just seems like it needed so much force i wasnt sure it needed to be compressed or not.
     
    Oxbow Thanks this.
  9. Oxbow

    Oxbow Road Train Member

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    I believe there are two identical pumps other than the length of the plunger. If your new one protrudes the same amount as the old you should be good, and you mentioned the old one didn't go back in either. With the pump in your hand you should be able to push in on it with your palm to get a feel for how much pressure is required.
     
    spsauerland Thanks this.
  10. Oxbow

    Oxbow Road Train Member

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    No problem. It's a bit of a chore to hold it in place with one hand while starting the bolts with the other - kind of an awkward position.
     
    Roger McG and spsauerland Thank this.
  11. nerv

    nerv Bobtail Member

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    Feb 10, 2022
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    I still cant seem to get it, the position is very awkward but also the force required to push the plunger in while getting the bolt started is driving me crazy. Yes they protrude the same distance. What im wondering is do i need to center it then compress and then start the bolt?
     
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