Head gasket change in action…no threads on timing chain?!? Help

Discussion in 'Gen 3 Prius Technical Discussion' started by Mellyman666, Sep 27, 2023.

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  1. Mendel Leisk

    Mendel Leisk MMX GEN III

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    There are tricks with setting, and releasing the timing chain tensioner as well; I think fairly well covered, around 29:00 in this GM video:



    Very thorough video btw. There is a continuity error, some repetition of content, starts around 33:00.
     
    #21 Mendel Leisk, Sep 29, 2023
  2. Mellyman666

    Mellyman666 Member

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    Bolt is not yet removed; I'm waiting to make an action plan to properly take it out in order to not due it quickly and f**k it up, since it's a hit or miss kind of thing. Does it need to be out of place in order to do the piston check?
     
    #22 Mellyman666, Sep 29, 2023
  3. ChapmanF

    ChapmanF Senior Member

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    A Prius engine doesn't really need a wrench to turn the crankshaft if there's no compression (as when the spark plugs are out, or the whole head is off). Turning it with a hand on the crank pulley is about as much effort as the handwheel on an old sewing machine.
     
    #23 ChapmanF, Sep 29, 2023
  4. Mendel Leisk

    Mendel Leisk MMX GEN III

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    I'm a little loss (having never done this myself lol). I believe you've got the timing chain cover off, accordingly the (beltless) pulley wheel on the end of the crankshaft off, and the bolt going through that pulley wheel off as well?

    upload_2023-9-29_9-20-41.png

    Engine section of Repair Manual attached:
     

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    #24 Mendel Leisk, Sep 29, 2023
  5. ChapmanF

    ChapmanF Senior Member

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    The pulley will easily slide back on (make sure the key's in the keyway too) for temporary sewing-machine-twirling duty.
     
    #25 ChapmanF, Sep 29, 2023
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  6. Mellyman666

    Mellyman666 Member

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    Here’s some pics to show what I have off at the moment. Starting to get a little lost with all the different terms now :( these pics were from when I removed the timing cover, so ignore the head block still being on, and also the chain is removed as well.
     

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    #26 Mellyman666, Sep 29, 2023
  7. ASRDogman

    ASRDogman Senior Member

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    Make sure you put the engine at TDC on the compression stroke.
    And lock down the intake cam shaft.

    It doesn't looke like the oil was changed very often. And cheap oil was used.
    Maybe even non synthetic oil.
     
    #27 ASRDogman, Sep 29, 2023
  8. Mellyman666

    Mellyman666 Member

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    I checked the pistons using the gasket masters video; according to everything they do which is check if they move when « pushing » them within their chamber, seeing if they align etc…and they are normal!
     
    #28 Mellyman666, Sep 29, 2023
  9. Mellyman666

    Mellyman666 Member

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    Yeah I’ve only done one oil change since having it as I have only had it one year, and my oil change was actually done at the mechanic’s. But before me, don’t know if the previous owner did a good job at keeping up with oil changes
     
    #29 Mellyman666, Sep 29, 2023
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