96 peterbilt 378 3406e cat. High oil temp

Discussion in 'Peterbilt Forum' started by irishluck09, Jun 30, 2020.

  1. irishluck09

    irishluck09 Light Load Member

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    Nov 24, 2019
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    What what the proper temps on this motor?

    My oil is running hot at 220-225*
    My water temp usually engages fan at 200* but had my temp light come on cause it got to 210-215*

    And now also my oil psi is at 50psi were it usually runs at 55-57psi.

    Idk if this matters but I just had dual 6" straight stacks put on and it had 1 5" muffler stack on it.

    96 Pete 378 3406e 5ek
     
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  3. royal trucking

    royal trucking Bobtail Member

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    My 96 pete oil temp runs around 180. Oil pressure 60lbs.
     
  4. irishluck09

    irishluck09 Light Load Member

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    Nov 24, 2019
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    Any idea why my oil temp would be so high?
     
  5. AModelCat

    AModelCat Road Train Member

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    Does this engine have a Brakesaver?

    Is the coolant running hotter than normal too? If so, could be a plugged rad.

    Could be a plugged up oil cooler too.
     
    Rideandrepair and bad-luck Thank this.
  6. irishluck09

    irishluck09 Light Load Member

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    I just got my ac fixed and it started running alot hotter. But still, it shouldnt get so hot that the truck has to pull over and cool off
     
    Rideandrepair Thanks this.
  7. Rideandrepair

    Rideandrepair Road Train Member

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    I thought normal oil temp is typically 20 degrees hotter than coolant. Oil pressure drops, hotter it gets. I would flush the radiator, clean the fins, by taking ata and ac condenser off. Clean them all good, make sure no restrictions in fins. And some new thermostats. If that don’t do it. I’d look at temp sensor, and maybe fan selinoid.
     
  8. Rideandrepair

    Rideandrepair Road Train Member

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    If the radiator fins are blocked, the heat from the condenser will make it run hot. Usually the a/c won’t work as well while idling, also.
     
  9. irishluck09

    irishluck09 Light Load Member

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    Would it matter if I said that my AC condensor isnt on my radiator like a stock one should be?
     
  10. 062

    062 Road Train Member

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    What does the pyro show your egt is?
    I’m guessing you’re oil temp sensor is at the bottom of the oil pan. I’d use a temp gun to confirm reading.
     
  11. irishluck09

    irishluck09 Light Load Member

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    Nov 24, 2019
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    My exhaust temp usually runs around 600*
    Yes my oil temp sensor is at bottom of oil pain and is new too
     
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