1. Attachments are working again! Check out this thread for more details and to report any other bugs.

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

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

Page 2 of 2
  1. ASRDogman

    ASRDogman Senior Member

    Joined:
    May 29, 2018
    6,421
    3,409
    0
    Location:
    Florida
    Vehicle:
    2010 Prius
    Model:
    Two
    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
    ItsDave likes this.
  2. rjparker

    rjparker Tu Humilde Sirviente

    Joined:
    Jun 6, 2008
    8,487
    5,054
    7
    Location:
    Texas Hill Country
    Vehicle:
    2012 Prius v wagon
    Model:
    Three
    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
    ItsDave likes this.
  3. ItsDave

    ItsDave New Member

    Joined:
    Aug 6, 2023
    29
    3
    0
    Location:
    Long Island
    Vehicle:
    2010 Prius
    Model:
    Four
    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

    Joined:
    Aug 6, 2023
    29
    3
    0
    Location:
    Long Island
    Vehicle:
    2010 Prius
    Model:
    Four
    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

    Joined:
    Aug 6, 2023
    29
    3
    0
    Location:
    Long Island
    Vehicle:
    2010 Prius
    Model:
    Four
    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

    Joined:
    Aug 6, 2023
    29
    3
    0
    Location:
    Long Island
    Vehicle:
    2010 Prius
    Model:
    Four
    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

    Joined:
    Mar 30, 2008
    24,902
    16,209
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    Back in the day, that would be read as a tad bit unbalanced.
     
    #27 ChapmanF, Oct 10, 2023
    ItsDave likes this.
  8. ItsDave

    ItsDave New Member

    Joined:
    Aug 6, 2023
    29
    3
    0
    Location:
    Long Island
    Vehicle:
    2010 Prius
    Model:
    Four
    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
    Mendel Leisk likes this.
  9. ItsDave

    ItsDave New Member

    Joined:
    Aug 6, 2023
    29
    3
    0
    Location:
    Long Island
    Vehicle:
    2010 Prius
    Model:
    Four
    The rockers appear to be undameged. Could collapsed lifters let the rockers fall off?
     
    #29 ItsDave, Oct 10, 2023
  10. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    24,902
    16,209
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    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

    Joined:
    Aug 6, 2023
    29
    3
    0
    Location:
    Long Island
    Vehicle:
    2010 Prius
    Model:
    Four
    No they don’t, by about .100”
    Looks like I bent the valves somehow
     
    #31 ItsDave, Oct 10, 2023
  12. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    24,902
    16,209
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    bummer
     
    #32 ChapmanF, Oct 10, 2023
    Mendel Leisk likes this.
  13. ItsDave

    ItsDave New Member

    Joined:
    Aug 6, 2023
    29
    3
    0
    Location:
    Long Island
    Vehicle:
    2010 Prius
    Model:
    Four
    Yeah
     
    #33 ItsDave, Oct 10, 2023
(You must log in or sign up to post here.)
Page 2 of 2