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CAT C7 Oil in Fuel

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Smellfunny, Jul 25, 2019.

  1. Jul 25, 2019 #1
    Smellfunny

    Smellfunny Road Train Member

    1,445
    967
    Jan 28, 2012
    South Carolina
    0
    Truck is putting oil in fuel. O-rings on injectors or injectors? Is there any way to have injectors tested? I called my local injection shop and they don't do them and could not recommend any where that did.
     
    Smellfunny, Jul 25, 2019
    Smellfunny, Jul 25, 2019
    #1
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  3. Jul 26, 2019 #2
    ClineER

    ClineER Light Load Member

    229
    139
    Apr 27, 2016
    N.E. Oklahoma
    0
    It's usually the injector orings. The middle oring gives way and pumps high pressure oil into fuel rail. I haven't seen an internal failure cause this problem. Start pulling injectors and one will have a cut oring.
     
    ClineER, Jul 26, 2019
    ClineER, Jul 26, 2019
    #2
    Smellfunny and Goodysnap Thank this.
  4. Jul 26, 2019 #3
    Smellfunny

    Smellfunny Road Train Member

    1,445
    967
    Jan 28, 2012
    South Carolina
    0
    Thanks. That was my plan. Pull the injectors, look at the orings, and go from there. I always like to give my customers worst case scenario as well as best case.
     
    Smellfunny, Jul 26, 2019
    Smellfunny, Jul 26, 2019
    #3
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