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Oil getting too hot

Discussion in 'Peterbilt Forum' started by irishluck09, Aug 17, 2020.

Page 4 of 4
  1. Aug 27, 2020 #31
    irishluck09

    irishluck09 Light Load Member

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    I think you'll are right. Im just going to bite the bullet and do the oil cooler and ill do the oil test too. The oil psi does drop a little but only by a few psi. Normally run at 56psi. It doesnt go below 50psi. The oil leaks i have are small. The oil pan has 2 leaks. Rear edges are cracked. Apparently a common issue on the 3406e. And tgen a small one on driver side of motor somewhere
     
    irishluck09, Aug 27, 2020
    irishluck09, Aug 27, 2020
    #31
    650cat425 Thanks this.
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  3. Aug 29, 2020 #32
    Onemanshow

    Onemanshow Light Load Member

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    Im thinking bad injector. At least that what it was with someone i know with new rebuild from cat.
     
    Onemanshow, Aug 29, 2020
    Onemanshow, Aug 29, 2020
    #32
  4. Aug 29, 2020 #33
    irishluck09

    irishluck09 Light Load Member

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    Why would you think its a bad injector?
     
    irishluck09, Aug 29, 2020
    irishluck09, Aug 29, 2020
    #33
  5. Aug 29, 2020 #34
    AModelCat

    AModelCat Road Train Member

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    I know @rank doesn't hang out here much anymore but IIRC he had a 3406B he chased high oil temps with and I seem to recall when he pulled the oil cooler, it was face plugged with debris (I want to say silicone?) It was restricting coolant flow into the cooler, causing the oil to run hot.
     
    AModelCat, Aug 29, 2020
    AModelCat, Aug 29, 2020
    #34
    spsauerland and pushbroom Thank this.
  7. Aug 29, 2020 #35
    pushbroom

    pushbroom Road Train Member

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    Ive seen silicone and debris on the face of the oil cooler causing high temps. Cummins oil coolers will foul as well causing high oil temps
     
    pushbroom, Aug 29, 2020
    pushbroom, Aug 29, 2020
    #35
    spsauerland Thanks this.
  8. Aug 29, 2020 #36
    irishluck09

    irishluck09 Light Load Member

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    why would it be clogged with silicone?
     
    irishluck09, Aug 29, 2020
    irishluck09, Aug 29, 2020
    #36
  9. Aug 29, 2020 #37
    AModelCat

    AModelCat Road Train Member

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    Usually from too much being used during a repair. It breaks off and floats thru the system. Or when a rebuild is done and excess silicone/gasket debris ends up getting scraped/buffed off by a mechanic and gets into a coolant passage.
     
    AModelCat, Aug 29, 2020
    AModelCat, Aug 29, 2020
    #37
    spsauerland and pushbroom Thank this.
  10. Aug 29, 2020 #38
    Rubber duck kw

    Rubber duck kw Road Train Member

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    Somebody applying silicone like a middle schooler with cheap deodorant.
     
    Rubber duck kw, Aug 29, 2020
    Rubber duck kw, Aug 29, 2020
    #38
    AModelCat Thanks this.
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