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Cat c-15 accert precooler doughnut gasket leak

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by vasili333, Oct 15, 2019.

  1. Oct 15, 2019 #1
    vasili333

    vasili333 Bobtail Member

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    Hello, i was wondering if anyone had issues with this doughnut gasket leaking. I had as exhaust stud break so I had to tear everything down. After I put everything back together and do a air leak test, seems to leak from there. Done it according to Caterpillar spec 18lbs-in. Tried tightening it tighter and still leaking, I'm on my third seal. Anyone have any pointers? Thanks
     
    vasili333, Oct 15, 2019
    vasili333, Oct 15, 2019
    #1
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  3. Oct 16, 2019 #2
    wtokhi

    wtokhi Light Load Member

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    what acert, mxs or bxs? by the doughnut gasket do u mean the entry into the precooler from the high pressure turbo with the v band clamp?
     
    wtokhi, Oct 16, 2019
    wtokhi, Oct 16, 2019
    #2
  4. Oct 16, 2019 #3
    pushbroom

    pushbroom Road Train Member

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    chrome_Bfku8brD4t.jpg

    Spec is 106 + or - 18inlbs. Needs to be alot tighter then what you have it at. Do you have the steel backup ring installed as well?
     
    pushbroom, Oct 16, 2019
    pushbroom, Oct 16, 2019
    #3
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  5. Oct 16, 2019 #4
    CountryBumkin

    CountryBumkin Bobtail Member

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    Jun 4, 2018
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    Does anyone have a copy of "Special Instruction REHS1728"? I bought the service manual but it doesn't have that publication.
     
    CountryBumkin, Oct 16, 2019
    CountryBumkin, Oct 16, 2019
    #4
  7. Oct 16, 2019 #5
    vasili333

    vasili333 Bobtail Member

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    My engine is a mx . I am talking about the doughnut gasket from high pressure turbo to precooler, and I do have a steel backing ring over the doughnut. I tried different torque no luck still leaks.
     

    Attached Files:

    vasili333, Oct 16, 2019
    vasili333, Oct 16, 2019
    #5
  8. Oct 16, 2019 #6
    Superhauler

    Superhauler TEACHER OF MEN

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    That donut Wont seal up until you get the engine up to operating temp and building boost pressure. It is designed to slide up and down on the turbo housing. It's a poor design.
     
    Superhauler, Oct 16, 2019
    Superhauler, Oct 16, 2019
    #6
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  9. Oct 16, 2019 #7
    vasili333

    vasili333 Bobtail Member

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    Sep 4, 2013
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    Its holding pressure but, I can hear a slow leak and when I spray some soap water on it it bubbles up pretty good.
     

    Attached Files:

    vasili333, Oct 16, 2019
    vasili333, Oct 16, 2019
    #7
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