Cat 3406a 90u parts help

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Matttargett4, May 20, 2025.

  1. Matttargett4

    Matttargett4 Bobtail Member

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    May 18, 2025
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    Hi,

    I’m looking at rebuilding a 3406a from a tractor, the current arrangement number is 6n9954 and serial is 90u2449. Current hp rating is 325, listed as static fuel .175.

    I would like to up the output a bit and have the arrangement number 1w6375 for the same tractor running 360hp.

    I bought a turbo for cheap as my muffler bearing is scrap and the turbo had one, it’s 0r-5370 which I believe is a 3406 turbo of some description.

    I’ve tried endlessly with sis and sorry if I’m plain stupid but I can’t come up with a list of part numbers that I’m confident to order.

    there are some experts here that I was hoping could tell me which components are different between those two arrangement numbers and numbers for pistons, rings, liners, mains and rod bearings, turbo, injector nozzles, piston cooling nozzles and also if my spare turbo is useful for anything other than parts.

    thanks for any help.

    Matt
     
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  3. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Well, yeah, we're truck drivers. From brain science to marriage counseling, we've got the answers

    @wore out and @Oxbow can probably help
     
    wore out, Jordonh, Sons Hero and 4 others Thank this.
  4. AModelCat

    AModelCat Road Train Member

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    You're missing a digit on that S/N.
     
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  5. Iamoverit

    Iamoverit Road Train Member

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    You just need a can of compression for that.
     
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  6. Oxbow

    Oxbow Road Train Member

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    Isn't your S/N start with just 9U?

    To the OP, I may be able to give it a go on SIS as far as what parts came with your motor, but you really need @wore out to sort out what you can swap. I think he knows A models.
     
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  7. AModelCat

    AModelCat Road Train Member

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    Mine's 92U
     
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  8. Oxbow

    Oxbow Road Train Member

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    Ah, that's right. I was confusing it with a 9U D6 dozer! Lol

    I'm getting old: That said, my memory is really good, but really short as well. Lol
     
  9. Matttargett4

    Matttargett4 Bobtail Member

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    May 18, 2025
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    Yes now you say it there is a number missing which took me a long time to work out, it’s stamped as 90u2449 but for sis you need 90u02449.

    it’s definitely 90u, it’s an early industrial 3406, but it is di

    matt
     
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  10. Joyce's Volvo

    Joyce's Volvo Light Load Member

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    Oxbow your not old just experienced, I have a D-6 9U old standard shift with winch operated it for years and seen many occasions where I’d would’ve had it instead of the newer power shifts.
    Have 3 of the 3406 2 in truck, one on drilling rig . Diesel specialist in Baton Rouge can help also pc construction in affton, wy. These guys have excellent parts availability not just cat only.
     
    Oxbow Thanks this.
  11. Oxbow

    Oxbow Road Train Member

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    Interesting. I'm only a couple of hours from Afton but had not heard of PC industries before. Learn something new everyday!
     
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