Freightliner Detroit 12.7 check valve

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Stray_Dog, Jun 12, 2021.

  1. Stray_Dog

    Stray_Dog Light Load Member

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    I've got a 2004 Freightliner Columbia I'm working on for a friend and we believe the check valve on the rear of the head is bad. It's losing prime over night, typical problem for these engines.

    This truck is a glider with a DDEC3 12.7

    My question is, what's the best way to get access back there to get to the check valve? It's gonna be a major pita to get to.

    Any suggestions?
     
    blairandgretchen Thanks this.
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  3. Arctic_fox

    Arctic_fox Medium Load Member

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    Do you have a handy 5 year old relitive you can "borrow" with bribes of icecream? Thats how my uncle used to get into tight places. He would give us a wrench and hold us by our waist to unscrew stuff behind the engine for him with our tiny hands.
     
  4. Stray_Dog

    Stray_Dog Light Load Member

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    Hah that's funny, but true!

    Unfortunately I ain't got any of those handy right now. I sure wish I did though.

    At this point we may pull the valve cover off and maybe that will gain us a little bit of clearance. We'll see!
     
    blairandgretchen Thanks this.
  5. Mike250rs

    Mike250rs Medium Load Member

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    also check the check valve on the fuel bowl. Often the spring/ping pong ball will get coated in soot and not seal correctly.
     
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  6. Stray_Dog

    Stray_Dog Light Load Member

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    Good point. You're right about that. I started with the Davco filter base and rebuilt it. I replaced the check valve you are talking about. Before I did that, the fuel bowl would lose its fuel level after 2 or 3 days of setting. Now that I replaced that valve it does keep the level in it now.

    It's just becoming increasingly hard to start after setting a day and I've traced it down to the check valve on the head (hopefully).
     
    blairandgretchen Thanks this.
  7. jason6541

    jason6541 Road Train Member

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    I use to pull the drivers side rear fender assembly if no skirts or pull skirt and splash shield. Turn steer tire hard to the right snd shimmy in between it snd frame. Can also use a scissor Jack and pull front cab mount to gain access. It fun for sure
     
  8. Stray_Dog

    Stray_Dog Light Load Member

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    I appreciate that.

    This thing does have the full skirting so that definitely sucks.
     
    blairandgretchen Thanks this.
  9. MLC Adventures

    MLC Adventures Light Load Member

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    Pull the valve cover, and Jake's. Lay something over the rockers and lay down with your legs over the radiator. Sucks, but not really a big deal.
     
    spsauerland and Stray_Dog Thank this.
  10. Stray_Dog

    Stray_Dog Light Load Member

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    That's what I was honestly considering doing but before I did I was hoping someone would have an easier way lol
     
  11. Swine hauler

    Swine hauler Medium Load Member

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    Unhook the air ride leveling valve for the cab \ sleeper, Jack up a couple of inches.
    Throw a piece of plywood across frame rails, crawl in.

    That's what I did, but I'm skinny.
     
    spsauerland and Stray_Dog Thank this.
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