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Cat C13 blowing oil cap off

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Guntoter, Dec 22, 2022.

  1. Dec 22, 2022 #1
    Guntoter

    Guntoter Road Train Member

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    I can't find anything in the search about checking/changing the breather on a 2006 C13. Im assuming it started blowing the filler cap off because the breather is plugged or broken. I have very little (if any) blow-by coming from the tube under the engine, but a small amount coming from the filler neck. I replaced the cap with a brand new one and it blew off within a few miles. No water/oil contamination in the radiator or oil pan, no smoke from the stacks. My thought is maybe the PCV, I read that there is a tin plate riveted inside the box that the tube drops out of (driver side front of the engine), if this plate is detached, the blow-by gets trapped.
    Any ideas, am I on the right path or could it be something else?
     
    Last edited: Dec 22, 2022
    Guntoter, Dec 22, 2022
    Guntoter, Dec 22, 2022
    #1
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  3. Dec 22, 2022 #2
    little cat 500

    little cat 500 Road Train Member

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    Blow by tub is probably clogged and under boost it blows cap off
     
    little cat 500, Dec 22, 2022
    little cat 500, Dec 22, 2022
    #2
    W923 and Guntoter Thank this.
  4. Dec 22, 2022 #4
    Guntoter

    Guntoter Road Train Member

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    Ooops... Habit I guess, it's a C13.
     
    Guntoter, Dec 22, 2022
    Guntoter, Dec 22, 2022
    #4
  5. Dec 22, 2022 #4
    ultra truck

    ultra truck Bobtail Member

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    A c13 had a filter and it should b a screen in the drivers side neer front of valve cover. If a accert c13 it should be about the same place but it's a filter in a round can style tank by the top of the blow by tube by valve cover.
     
    ultra truck, Dec 22, 2022
    ultra truck, Dec 22, 2022
    #4
    W923 Thanks this.
  7. Dec 25, 2022 #5
    IH9300SBA

    IH9300SBA Road Train Member

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    I remember a Service Bulletin where we had to tap the oil fill tube and put a new oil fill cap on, and I believe it was the expandable rubber plug but don't recall exactly. Seems the original was a plastic cap that locked on to two nubs and wouldn't hold.
     
    IH9300SBA, Dec 25, 2022
    IH9300SBA, Dec 25, 2022
    #5
    Oxbow Thanks this.
  8. Dec 30, 2022 #6
    Smellfunny

    Smellfunny Road Train Member

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    I ordered a new fill tube and cap for a C15 this week. The new one was smaller than the old one. I remember something in the past about tapping the fill tubes as well.
     
    Smellfunny, Dec 30, 2022
    Smellfunny, Dec 30, 2022
    #6
    Oxbow and IH9300SBA Thank this.
  9. Jan 10, 2023 #7
    Lowboy456

    Lowboy456 Light Load Member

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    My C13 blew the filler cap off yesterday and I lost 5 gallons of oil before realizing it. Luckily I stopped for a bathroom brake and saw oil all over my left battery box and dripping off the fenders.
     
    Lowboy456, Jan 10, 2023
    Lowboy456, Jan 10, 2023
    #7
    Oxbow Thanks this.
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