Cummins isx common problem???

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by mrkillerjr, Dec 8, 2017.

  1. mrkillerjr

    mrkillerjr Bobtail Member

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    Apr 13, 2014
    Tallahassee, FL
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    Hey all, I got a ftl cascadia with cummins isx. I noticed some oil leaking and friend of mine suggested the compressor gasket, after changing that, it was the front crank seal, then the front cover seal. The oil leak still persist so decided to take it to a shop shop. I took a fuel pump gasket with me cause thats where I saw the oil running down. He said that's not the problem......

    He said the OIL GULLEY, IN FRONT OF THE ENGINE, HAS A COMMON TENDENCY TO START SEEPING AND THE OIL RUNS DOWN THE SIDE...

    I've searched online for a oil gulley leak or seep or every word imagined, but no results..

    IS THIS SHOP PULLING ONE OR ME??
    THANKS IN ADVANCE.
     
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  3. mrkillerjr

    mrkillerjr Bobtail Member

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    Apr 13, 2014
    Tallahassee, FL
    0
    Also he said it will be a 20 hour + job and quoted a cool 4k
     
  4. Heavyd

    Heavyd Road Train Member

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    All engines leak oil. Unless it is making a big mess, I just recommend washing it from time to time. If you have pictures, we could look and try to pinpoint.
     
  5. mrkillerjr

    mrkillerjr Bobtail Member

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    Apr 13, 2014
    Tallahassee, FL
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    Well that's the thing, the shop said you can't physically see the leak because it's behind the front cover next to where the compressor bolts on to the block.. it's the oil gully.. and that's the big question, if it is a common problem with cummins, there should be some info out there on the web, which I can't find. And I don't even know if the oil gully is a tube or its actually cut into the block or what!!?
    But basically the oil runs down and is most noticeable around where the fuel pump bolts on to the block and it drips down from there per gravity.
     
  6. Heavyd

    Heavyd Road Train Member

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    The main oil gallery or rifle is cut through the front of the block to go from one side of the engine to the other. So if that is leaking you are looking at front cover to the block reseal. That is a big job and requires the gear train to be taken apart. This is not a job for a diy'er or backyard guy. The other common leak is the cam shaft thrust plates that can leak down and in behind the front cover, which also requires the cam gears to come off. Also a big job, this is why I say to wash it and live with it unless it is a big leak.
     
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  7. mrkillerjr

    mrkillerjr Bobtail Member

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    Apr 13, 2014
    Tallahassee, FL
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    10/4.. thanks a million. P.s. do u know if this is a common isx issue dough.?
     
  8. Heavyd

    Heavyd Road Train Member

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    It isn't uncommon, but something you would see more of on older engines.
     
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  9. bzinger

    bzinger Road Train Member

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    Hey heavy I got a ? About my 13 isx while your here .
    Its got 561k on in it and recently it started using oil which got progessivly worse until it was guzzling a gallon at a 1000 miles .
    All the while ran perfect with no smoke and great mpg .
    So it was determined the crankcase filter was plugged and switched out to the lifetime version and
    oil consumption dropped off to 2000 miles on a gallon .
    I still wasn't happy with that so I thought maybe I've got some carbon packing going on ? And ill try some howes meaner power cleaner and see what happens ?
    So I treated every load of fuel with it for about 4000 miles and worked the snot out it on the hills and mountains .
    Watching the exhaust closely in these hard pulls I saw it belch out some grayish looking smoke a few times that didn't smell like a regen.
    Within the first 1200 miles it took my davco filter from nearly 3/4 full down to less than 1/2 full and for the last 3000 miles it hasn't used any oil at all .
    What's your opinion on this turn around ?
     
  10. Heavyd

    Heavyd Road Train Member

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    Yes, for sure your oil consumption sounds like carbon packing on the rings. It also sounds like the fuel solution is doing it's job. I would account the smoke and weird smell to the extra additives in the fuel burning off. I have seen Davco's fluctuate a bit in their level, but I would just replace the filter to be safe. Make sure you replace the top cap oring and base cap oring with the new ones that come in the filter kits, some guys skip those steps sometimes.
     
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  11. bzinger

    bzinger Road Train Member

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    Thank you sir !
     
    Oxbow Thanks this.
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