1. Raytheeagle

    Raytheeagle Senior Member

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    Good to see you back:).

    How’s the head gasket doing:whistle:?

    Might do a meetup in a couple of weekends if you are around;).

    Maybe we’d get to see the Prius this round instead of that nice white shiny Bolt(y).
     
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  2. danlatu

    danlatu Senior Member

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    Our 2010 prius had a knock at start up. No codes @ 70k found a pool of oil in IM coming from the pcv. Egr ports on IM where relatively clear for air flow. I only cleaned the IM and installed an OCC. 2.7 years later @ 125K p0401 egr code popped with car running fine with no knock since 70k. I pulled the IM, EGR and EGR cooler to clean them. Reinstalled everything and car is running fine.
     
  3. Jon Watkins

    Jon Watkins Active Member

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    I’m wondering if the 2015 really needs a catch can due to the revised pistons/rings. Bought my wife’s 2015 two about 6 months ago with 37.5 miles and immediately installed a catch can with stainless scrubbing pads in it. It has been driven appx 4k miles since then. Waxed it yesterday and checked the catch can while I had it in the garage. I tend to check the catch can about every 1k miles or so. Yesterday it had less than 1/2 teaspoon of water consistency oil in it. Over the 4k miles she has driven it I don’t think I’ve gotten more than a tablespoon of oil out of catch can in total. I know...cheap insurance regardless.
     
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  4. Mendel Leisk

    Mendel Leisk Senior Member

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    Your post has me starting to type, then deleting. Maybe there's less oil mist in the PCV air flow with the revised pistons/rings?

    A post-winter check of the OCC should yield the most, fwiw. Revisit the intake manifold occasionally too: The easiest way with a good view is to lift off the throttle body: I've checked ours a year post-install, and there was just a sheen of oil at the intake manifold sump, no more pool.
     
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  5. Montgomery

    Montgomery Senior Member

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    I didn't know they put in different rings for my 2015. I have approximately 34k miles right now. Did Toyota really put in different pistons and rings?
     
  6. Mendel Leisk

    Mendel Leisk Senior Member

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    That's what I'm seeing, just plugging various 3rd gen years in at McGeorge Toyota, and asking for pistons and rings:

    upload_2018-12-7_16-58-36.png

    Note that the latest pistons/rings part no's are those spec'd in the TSB for excessive oil consumption fix.
     

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  7. RMB

    RMB Senior Member

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    Mendel, if time permits, can you dig a little deeper and look into year 2016 and up for the models using the same Gen 3 engines as in Prius v, Lexus CT200h and perhaps Gen 4 piston and rings part numbers to compare?;)

    Edit: I’m just curious if those engines are also using the improved parts, just curious, it’s not important at all.:p
     
  8. Raytheeagle

    Raytheeagle Senior Member

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    Time :ROFLMAO::ROFLMAO::ROFLMAO::ROFLMAO:.

    He’s got time(y).
     
  9. Montgomery

    Montgomery Senior Member

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    Wow! looks like I bought it at the right build and time.
     
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  10. Mendel Leisk

    Mendel Leisk Senior Member

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    I checked Prius v, it is similar, except the transition occurs completely in 2015, 2014 has the old pistons still.

    4th gen has a new piston and ring.

    It's quite easy to check any year/model: just enter the vehicle on McGeorge, then search for piston or piston ring.

    Yes. Funny thing is, a lot of older 3rd gen Prius are not using any oil. Except overnight they can start. It seems like there could be a threshold. Maybe having cleaned EGR and an oil catch can helps too: time will tell.
     
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  11. Mendel Leisk

    Mendel Leisk Senior Member

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  12. padroo

    padroo Senior Member

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    Looks like a work in progress with pistons and especially piston rings. It would be interesting to know what they changed.
     
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  13. Mendel Leisk

    Mendel Leisk Senior Member

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    Yeah I tried googling those part numbers, hoping to find some images to compare. No luck.
     
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  14. Landon51

    Landon51 Member

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  15. bwiencek

    bwiencek Junior Member

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  16. Titus415

    Titus415 New Member

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    did you add the seal packing to the front of the head gasket to seal against the timing cover? is it required?
     
  17. Mendel Leisk

    Mendel Leisk Senior Member

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    Repair Manual instruction is to apply a bead under:

    upload_2019-1-21_11-57-9.png

    And then atop the head gasket, in the same zone. More info in attached.
     

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  18. Mendel Leisk

    Mendel Leisk Senior Member

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    Great video here, btw. Lots of hands-on tips:

     
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  19. padroo

    padroo Senior Member

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    He works pretty quick, I always do a better job of cleaning parts.
     
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  20. Patrick Wong

    Patrick Wong DIY Enthusiast

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    In the video, I am surprised they use a steel blade to scrape the aluminum surfaces. I think that risks scratching the aluminum. It would be better to use a plastic tool and solvent to clean the aluminum.
     
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