Peterbilt coolant loss

Discussion in 'Ask An Owner Operator' started by acisner6, Jun 11, 2021.

  1. acisner6

    acisner6 Bobtail Member

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    May 10, 2016
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    I have a 2014 peterbilt cummins engine 900k miles
    It suddenly started losing coolant it went from not losing anything to losing about a gallon a day. No leaks under truck nothing coming from exhaust that I can see. Oil from dipstick looks good but I took off oil fill cap with engine running there’s a lot steam coming out. Anybody have this happen or have an idea what it might be.
     
    Last edited: Jun 11, 2021
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  3. HillbillyDeluxeTruck

    HillbillyDeluxeTruck Road Train Member

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    EGR coolers are known culprits. A sunk liner can be another cause. Cracked head yet another.
     
  4. Rideandrepair

    Rideandrepair Road Train Member

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    Hopefully it’s the egr cooler. Not a pinhole in a piston liner. Must be going out the exhaust, if it’s not in the oil, or on the ground. Only other place I know of would be a transmission cooler. If you have the coolant type. It could be going into the transmission. Usually it’s just a small amount. I doubt it’s that. Easy to check though. Take the fill plug out, see if it’s way overfilled.
     
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  5. mudflap77

    mudflap77 Heavy Load Member

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    I recently had the same issue. I wasn't losing that much. But mine was leaking from one of the 3/8" heater hose that supplies coolant to the DEF dose. It was dripping on to the exhaust so it never left a puddle. The only indication was the hose collected some dust. On the 579 w/sleeper there is two 6" long hoses collected to the sleeper hvac.
     
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  6. bad-luck

    bad-luck Road Train Member

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    Have EGR cooler checked
     
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  7. B-unit trucking

    B-unit trucking Bobtail Member

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    I’m having the same problem right now… Did you figure it out?
     
  8. snowwy

    snowwy Road Train Member

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    If you pull the oil cap off and lotsa smoke comes out. It's time for a rebuilt.

    If you try to add oil with it running. It'll literally blow the jug off.

    I was using 4 gallons coolant a day and a fresh oil change only lasted a week before oil pressure went dead.
     
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  9. 77fib77

    77fib77 Road Train Member

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    Take off the EGR pipe and see if the pipe goting into the intake manifold is fouled up?????


    If it's EGR. The oil pressure is higher than the coolant, so it should push into the radiator???

    Are these right?
     
    Grek8888 Thanks this.
  10. snowwy

    snowwy Road Train Member

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    I'd think if it pushed in to the coolant. You'd see steam and coolant loss out the cap. Maybe even blow the reservoir up. From too much pressure.

    I installed a new cap cuz I thought it was bad. It was only a marginal improvement of coolant loss.
     
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