3406b-c? build

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by cjexcavation, Dec 3, 2021.

  1. cjexcavation

    cjexcavation Bobtail Member

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    Dec 3, 2021
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    hey guys i have a 3406b serial 3zj52709 in a 89 379 tri axle dump . I love the truck i just want to build a reliable powerhouse. This truck does not get worked but 1-2 days a week , to pull equipment or haul dirt/gravel. 4.56 gearing 18 speed. I would think this truck should move a mountain, top speed is close to 60 at 1900rpm

    i have already swapped turbos for a 177148, new cac/boots/piping, new fuel lines, new fuel pump, adjusted fuel screws and afr but it just doesnt have the power i feel like it should when you hit a hill. Loaded with 20 ton of gravel is really tough.

    post turbo pyro reads 750 going up hill loaded , foot to the floor
    no smoke except a small puff after shift. slight haze at idle
    new turbo got boost up to 28 psi

    Im looking for suggestions on pump modifications/parts? i would really this truck to be a power house
     
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  3. kwswan

    kwswan Road Train Member

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    @wore out is the fella you need to talk to.
     
  4. cjexcavation

    cjexcavation Bobtail Member

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    Dec 3, 2021
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    Man I have read for 2 months and tried every combo and just can’t get it to pull, so I figured it was time to make a thread. Excited to hear suggestions.
     
    Rideandrepair Thanks this.
  5. OutlawW900

    OutlawW900 Bobtail Member

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    Dec 2, 2021
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    Have you thought of bigger injectors?
     
  6. cjexcavation

    cjexcavation Bobtail Member

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    Dec 3, 2021
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    That’s what my thought was but I have the 16.4:1 pistons so would the marine injectors work with that?
     
  7. OutlawW900

    OutlawW900 Bobtail Member

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    Dec 2, 2021
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    Ok so I took long to reply because I wanted to ask before I got on here and sounded crazy. I asked my friend the details of what exactly was done when he rebuild his 3406b. So marine injectors were added along with iron pistons which are not marine pistons. I asked what the compression is on his iron pistons and he wasn’t sure. I will ask a mechanic to be sure because those pistons are popular here in south Florida so they’re easy to inquire about. Hope this helps maybe.
     
    Oxbow Thanks this.
  8. cjexcavation

    cjexcavation Bobtail Member

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    Dec 3, 2021
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    It does help man . Thanks for the reply , I have talked to 30 people in two days about getting it meter timed and no has the tool . Bummer
     
    LameMule Thanks this.
  9. Dirt101

    Dirt101 Bobtail Member

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    Aug 14, 2021
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    I’m having the same problem( not low power, but trailing smoke, want to get the timing looked at)with my b model. Can’t find somebody to meter time it.
     
  10. cjexcavation

    cjexcavation Bobtail Member

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    Dec 3, 2021
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    I ended up timing pin timing today and advancing by marking tdc on damper and a mark roughly 7/16” away from it to advance to 17.5 I read ynot say that in one post . Runs about the same so it must have been close lol
     
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