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2010 timing chain, can you get it to skip a tooth?

Discussion in 'Gen 3 Prius Technical Discussion' started by ItsDave, Oct 1, 2023.

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  1. ASRDogman

    ASRDogman Senior Member

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    You could buy a tap the size of the plug to clean out the threads.
    Put grease the groove to catch any material.
    When I have a head off, I clean the lower part of the spark plug hole then run
    a plug from the piston side then I know the I won't have a problem with a new plug.


     
    #21 ASRDogman, Oct 9, 2023
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  2. rjparker

    rjparker Tu Humilde Sirviente

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    It is unlikely four plug threads are bad much less one. No compression probably means something wrong on the cams, rocket arms or caps. It has happened before.

    I would measure the compression.

    IMG_3109.jpeg IMG_3110.jpeg
     
    #22 rjparker, Oct 9, 2023
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  3. ItsDave

    ItsDave New Member

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    I’m leaning towards something to do with the valves too. Was hoping maybe one of those washers came off a spark plug or something. I do not know.
    We’ll know soon because I’m about to dig in to it again
     
    #23 ItsDave, Oct 10, 2023
  4. ItsDave

    ItsDave New Member

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    How does one crank a Prius to do a compression test with a manual gauge?
     
    #24 ItsDave, Oct 10, 2023
  5. ItsDave

    ItsDave New Member

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    Found a thread for that, I’ll link to it later when I have time
     
    #25 ItsDave, Oct 10, 2023
  6. ItsDave

    ItsDave New Member

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    Don’t mind me folks. This is just my new blog as I do this.
    Compression;
    170-170-170-0
     
    #26 ItsDave, Oct 10, 2023
  7. ChapmanF

    ChapmanF Senior Member

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    Back in the day, that would be read as a tad bit unbalanced.
     
    #27 ChapmanF, Oct 10, 2023
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  8. ItsDave

    ItsDave New Member

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    Intake rockers for #4 laying in the valley. Timing marks for reference.
    71864279388__63724707-0BDD-45F2-A26C-375E207A54DA.jpeg IMG_3372.jpeg IMG_3374.jpeg IMG_3370.jpeg
     
    #28 ItsDave, Oct 10, 2023
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  9. ItsDave

    ItsDave New Member

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    The rockers appear to be undameged. Could collapsed lifters let the rockers fall off?
     
    #29 ItsDave, Oct 10, 2023
  10. ChapmanF

    ChapmanF Senior Member

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    Argh. Hmm. Those two intake valves, do they rise up as far as they should now, to seat fully closed?
     
    #30 ChapmanF, Oct 10, 2023
  11. ItsDave

    ItsDave New Member

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    No they don’t, by about .100”
    Looks like I bent the valves somehow
     
    #31 ItsDave, Oct 10, 2023
  12. ChapmanF

    ChapmanF Senior Member

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    bummer
     
    #32 ChapmanF, Oct 10, 2023
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  13. ItsDave

    ItsDave New Member

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    Yeah
     
    #33 ItsDave, Oct 10, 2023
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