2011 Prius Head Gasket Failure

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

  1. ChapmanF

    ChapmanF Senior Member

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    I'm not sure I follow. Isn't that piping something like 12 mm diameter? When not occluded, with intake manifold vacuum at one end and exhaust manifold pressure at the other, and the valve wide open (tiny? looks like it has a bore comparable to the pipe), the flow volume could be pretty respectable.

    And the ECU really does have to control that valve according to rpm and load; opening it even a small fraction of the way is enough to asphyxiate the engine at idle.
     
  2. Mendel Leisk

    Mendel Leisk Senior Member

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    There were several previous comments that maybe high speed driving, hill climbs, or whatever could "blow the carbon out". I'm thinking the rate of flow is way too low for that.
     
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  3. Grit

    Grit Senior Member

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    True statement. Bill Norton say otherwise :LOL:
     
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  4. CR94

    CR94 Senior Member

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    Prius engine runs at low manifold vacuum (high MAP) most of the time, unlike most.
     
  5. FnRedPrius

    FnRedPrius Member

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    If running a Prius WOT will burn off the carbon, my EGR system should have looked like polished chrome.
     
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  6. mjoo

    mjoo Senior Member

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    Bill the science guy would say the carburetor needs tuning.

    Pixel XL ?
     
  7. wheezyglider

    wheezyglider Active Member

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    Plus, to be super pedantic, the EGR valve closes when the demand is high, so WOT might clean something but it won't be the EGR path. ( And I tested this today going up a steep hill while watching Torque dials: when the HSI pushed to the top end of red, EGR step dropped from 60-ish to 0. Wikipedia got something right! )
     
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  8. SFO

    SFO Senior Member

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    Not only directed at Avi, as everyone is welcome to comment.

    Do you have a preference on Head Sets (Toyota, Beck Arnley, Fel-Pro, etc) -- are any actually better and why?

    Knowing that Federal-Mogul owns Beck Arnley and Fel-Pro (Hybrid 911 claims to use Fel-Pro head sets), is the overall quality the same for either? It looks like both come with or are missing extra gaskets or pieces parts.

    Here is the $89 Beck Arnley head set at RA : https://www.rockauto.com/en/moreinfo.php?pk=8383384

    Here is the $114 Fel-Pro head set at RA : https://www.rockauto.com/en/moreinfo.php?pk=6787428

    Here is an $69 ebay head set that includes head bolts and a single tube of RTV : Head Gasket Bolts Set Fit 10-13 Lexus CT200H Toyota Prius 1.8 2ZRFXE | eBay

    Another ebay listing that appears to be the same as above, and also doesn't include the timing tensioner gasket, the pictured parts sheet makes mention of the Federal-Mogul website, though unsure if this set is FM : Fits 10-15 Toyota Prius V Lexus CT200h 1.8L Hybrid Head Gasket Set Bolts 2ZRFXE | eBay
     
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  9. cnc97

    cnc97 Senior Member

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    The FelPro head gasket set that I used when reinstalling my Gen 3/4 engine had a head gasket that looked like the OE gasket. I can’t prove that it was a Toyota part in the box, but most of the FelPro head gaskets stocked in my store are blue, not the black color the OE one and the one I installed were. Is it possible that one bought the gasket from the other, yes. But there is really no way to prove who bought from whom.
     
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  10. Mendel Leisk

    Mendel Leisk Senior Member

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    Is Toyota the only one that makes a full gasket kit, that one that's got the head gasket plus most other rubber gaskets, O-rings, valve guides and so on?

    It's indicated as this p/n:

    04111-37315

    in the attached TSB.
     

    Attached Files:

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  11. Igortigor

    Igortigor Junior Member

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    So I replaced HG, put everything together, car is idling rough. Turned out I skipped chain one tooth on crank shaft. So I took cover off, put chain where it supposed to be, still idling rough with P0301 code. I did compression test, cylinder 1 has 0 compression, others around 90psi. Took everything apart again, now I found intake valves on cyl1 were not closed all the way. My question is: could 1 tooth off timing chain cause valves to bend?
     
  12. ASRDogman

    ASRDogman Senior Member

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    Yes, now that you started it and had it running. This was discussed in another thread.
    I don't remember where it's at though, sorry.
    ALWAYS rotate the engine by hand 720 degrees and check the timing marks.
    If you can't turn it over by hand, then the timing is off.

    If you think about it, you probably heard a loud "clank" when(if) the piston hit the valve.
    Since you have it apart, you can replace the valves, seat them in, then make SURE you get
    the timing marks correct.

    Then rotate the crank 720 degrees and the marks should be lined up.

     
  13. The Critic

    The Critic Resident Critic

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    Not likely, I would have expected this to have bent move than just the intake valves on cyl #1. Is it possible that you have debris or another condition that is preventing the intake valves from sealing properly? Did a machine shop attempt to perform a valve job?
     
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  14. cnc97

    cnc97 Senior Member

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    My suspicion is that on assembly of the cam bridge to the head, the cams were not located properly. As the bridge bolts were tightened down, the number one valves opened. This caused the bend to the valves. The manual says to lock the cams before the bridge is removed and unlock them only after the chain is on and tensioner applying tension. One tooth one way or the other is not far enough out of time to bend valves.
     
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  15. Igortigor

    Igortigor Junior Member

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    2 intake valves on cyl 1 were bent. Good thing they are not too expensive. After replacing them engine runs smooth. I still get little bit of shaking/vibrating at 1500rpm. Will take intake manifold out and clean very good with some kind of degreaser. See if that helps.

    The Critic: I did not take head to machine shop. The head seamed to be in good shape.
     
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  16. The Critic

    The Critic Resident Critic

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    Thanks for the update. Glad to read that you were able to get this resolved.
     
  17. douglasjre

    douglasjre Active Member

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    Thanks for the follow up!
     
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