2011 Prius Head Gasket Failure

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by The Critic, Feb 28, 2019.

  1. Mendel Leisk

    Mendel Leisk Sand Pounder

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    I'd advocate the engine coolant mileage interval: 100K miles the first time, and 50K at least for the next time, and set future interval based on what the the second cleaning revealed.

    My first cleaning was around 71K kms, works out around 45K miles. Will be doing a second at the spark plug change interval, since the cowl's off, which will be at the 12 year mark, very likely still under 100K kms.
     
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  2. ASRDogman

    ASRDogman Senior Member

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    I only have 256,000 miles on mine. Engine coolant is at the same spot as it was
    when I changed it at 200,000 miles. MAYBE slightly lower, due to evaporation since it's not a
    completely sealed system.
    Still on the original head gasket, water pump, inverter pump....
    Though I have bought an inverter pump, water pump is next.
    I'll probably change the EGR Cooler and clean the intake all all related items at 260,000 miles.
    And change both coolant pumps while I'm at it.

    I believe it also depends on HOW your drive. The previous owner and myself drove about the same.
    About 85% highway miles. 65mph most of the time. So it keeps a more constant heat level.

    I really need front struts, but, I think the water pump is a little more important at this time.

     
    #162 ASRDogman, Nov 18, 2021
    Last edited: Nov 18, 2021
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  3. OptimusPriustus

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    Good summer project indeed:) Anyway, just had the job done and there surely had been gunk. However, mechanic said the IM had been surprisingly clean. Those tiny holes definately not clogged. Car has 212kkm on the clock. In any case the mechanic -whom i know well and who was skeptic about the whole cleaning- said that ”it was about time”.
    F2AAAE8A-FEA2-4A33-9996-39F18D97C413.jpeg 1E804271-BBEC-451B-873D-1887CFF549CF.jpeg



    Pcv valve was replaced as preventive maintenance and i was told the old one was shot. But explanation made me wonder. He said ”its one way valve but airflow could be applied both directions”. But isn’t pcv valve designed that way? Normally open.
     
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  4. OptimusPriustus

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    Why would anyone feed exhaust gas into intake when maxing out? Even in Prius or other eco-optimised combustion engine. I think there is some big time misunderstanding going on
     
  5. Mendel Leisk

    Mendel Leisk Sand Pounder

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    no kidding it’s about time, completely clogged!
     
  6. OptimusPriustus

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    Yeah, well - car was running just fine. Perhaps it’ll now run even better:) Like fly or something
     
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  7. ChapmanF

    ChapmanF Senior Member

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    PCV valves have several tricks up their sleeves. Closing in the backwards direction is one of them.

    [​IMG]
     
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  8. OptimusPriustus

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    Yes. I am hoping oil consumption go down
     
  9. Bill Norton

    Bill Norton Senior Member

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    Isn't it unusual for the factory service schedule to totally ignore this common condition?

    Especially if it is somehow linked to head gasket failures....(n)

    Is it company policy to not bother with preventive maintenance recommendations after 100k mi/km?
     
  10. Nor'easter

    Nor'easter Member

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    I've observed the action of the EGR in Techstream while operating the car normally. The EGR has always been closed at full throttle and at idle. It's generally open to some degree in the midrange.
     
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  11. ChapmanF

    ChapmanF Senior Member

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    That would agree with what I was reading in the technical training materials on TIS.
     
  12. OptimusPriustus

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    I’d say it’s very common accross all brands. It’s not economically ”viable” to have maintenance schedule that covers old and completely worn out vehicles. How could they set the standards? Where would it end? Around here a guy took his high mileage mercedes to dealership and ordered maintenance with a sidenote ”replace all wearing parts whereas necessary”. He got a hefty bill since even some door hinges had been replaced:)

    I am not aware of any car that has egr system cleaning in the maintenance schedule. It’s usually like tailpipe; if it breaks then it’s replaced. I had my system cleaned and there was lot of gunk (of course) but egr passages in IM not clogged at all. Cooler was so clogged that probably the famous red light was just around the corner. Had it happened dealership would have changed cooler, maybe even the valve and charged lots of €€€. But probably no other drama.
     
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