Fuel leak from....glow plug?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by zaroba, Jan 23, 2020.

  1. zaroba

    zaroba Medium Load Member

    303
    322
    Aug 28, 2012
    South East PA
    0
    Trucks been sitting at home while I work on getting my own authority. Drove my truck to a dealership last week to buy a trailer and let it idle while there since it hasn't run for a few weeks.

    After about an hour I found a large puddle of diesel on the ground and it was dripping off the engine like a leaking toilet. Maybe half a gallon to a gallon per hour. Luckily not the turbo side.

    Anyway, made the short drive back home and decided to investigate today. Found the leak right away. Big bolt on the block leaking fuel.

    Any of you experts know what it is? Injector? Glow plug? I'd try tightening it but will have to take off some stuff in the way first.

    Paccar mx13, 2016 t680

    20200123_150652.jpg
     
  2. AModelCat

    AModelCat Road Train Member

    14,422
    56,560
    Jul 7, 2015
    The North
    0
    Just looks like a sensor to me. Might just be loose, maybe an o-ring or flat seal under it?

    I'll tag a few folks that are more familiar with the MX than I.

    @spsauerland @pushbroom
     
    zaroba and spsauerland Thank this.
  3. zaroba

    zaroba Medium Load Member

    303
    322
    Aug 28, 2012
    South East PA
    0
    Think you're right, gotta be a sensor. It's the only one of those things on that side of the engine.
     
  4. spsauerland

    spsauerland Road Train Member

    2,870
    7,335
    May 31, 2010
    West Harrison, In
    0
    It's the fuel temp sensor. Just had one leaking earlier this week. Just need a new sealing washer.
     
    Goodysnap, SAR and zaroba Thank this.
  5. zaroba

    zaroba Medium Load Member

    303
    322
    Aug 28, 2012
    South East PA
    0
    Gotta figure out how to get the darn thing out. Finicky locking nut connections.

    If I can get the sensor off, I can use a large socket to remove or tighten the bolt and replace the seal/washer.

    20200123_155225.jpg
     
  6. spsauerland

    spsauerland Road Train Member

    2,870
    7,335
    May 31, 2010
    West Harrison, In
    0
    It's a DIN connector. The black nut unscrews. Sensor just screws out, uses 1 1/16 socket. M12 or M14 thread, original is fiber ring.
     
    SAR Thanks this.
  7. zaroba

    zaroba Medium Load Member

    303
    322
    Aug 28, 2012
    South East PA
    0
    Ended up having to use some channel lock plyers to get it started and it came right out. Washer crumbles like wet tissuepaper.

    Replaced the washer with a new one from auto zone and so far it is holding. Going to idle the truck for half an hour or so to make sure it stays holding when the engine warms up and give it another tighten.

    20200124_130939.jpg
     
    spsauerland Thanks this.
  8. Mike250rs

    Mike250rs Medium Load Member

    457
    1,414
    Sep 24, 2019
    Raleigh, NC
    0
    Now buy yourself a happy meal. You just saved yourself a ton of money is shop fees
     
  9. spsauerland

    spsauerland Road Train Member

    2,870
    7,335
    May 31, 2010
    West Harrison, In
    0
    Thanks for updating so some guy don't come here in five years asking how you fixed it.
     
  • Draft saved Draft deleted