Cat 3406B oil leak problems

Discussion in 'Trucks [ Eighteen Wheelers ]' started by truckin-fool, Oct 30, 2020.

  1. truckin-fool

    truckin-fool Bobtail Member

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    Oct 29, 2020
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    I have a 3406b with roughly 1,000,000 miles on it
    There is a massive leak from the injection pump as well as the oil pan it looks like

    does anyone have experience with these issues?

    How much would it roughly cost to repair these issues?

    3406b.jpg
     
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  3. jamespmack

    jamespmack Road Train Member

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  4. AModelCat

    AModelCat Road Train Member

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    You're most likely going to have to clean all that gunk off first. Way easier to see what's leaking when its cleaned up.
     
    Last edited: Oct 30, 2020
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  5. little cat 500

    little cat 500 Road Train Member

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    looks like its been leaking for that 1,000,000 miles pump needs sealed up
     
  6. truckin-fool

    truckin-fool Bobtail Member

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    Oct 29, 2020
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    what kinda cost am I looking at to seal it up?

    Im trying to figure out if its more cost effective to drop in a newer motor in instead of trying to fix this one with the miles it has on it
     
    Last edited: Oct 30, 2020
  7. SmallPackage

    SmallPackage Road Train Member

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    Five years ago I was getting parts for one of My Cummins PT pumps and the pump shop had a rebuilt mechanical 3406 pump painted and ready to install sitting on the shelf. It had a $2500 price tag on it. They said that was the price for a non core buyer. Much cheaper. Possibly half that if you swap rebuildable one for it or they rebuild yours and you get it back.
     
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  8. MACK E-6

    MACK E-6 Moderator Staff Member

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    Aren’t B model CATs pretty much notorious for oil leaks anyway?
     
  9. truckin-fool

    truckin-fool Bobtail Member

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    yes they are but I would like to have a nice clean engine
     
  10. wore out

    wore out Numbered Classic

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    No need to spend 2500 on a reman pump. For about 250 bucks you can reseal that whole govnor section on the truck. Put a 8M-9141 govnor spring in it, add an extra washer to spring pack. New weights, pins and races.


    On the bottom rail of the block just above the oil pan there are several plastic plugs with o rings that seal them. They often leak and the pan gets the blame.
     
  11. truckin-fool

    truckin-fool Bobtail Member

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    thank you for the information, thats great news now I need to find a reputable shop in Reno that can do the work lol
     
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