Timing chain tensioner leaking

Discussion in 'Gen 3 Prius Technical Discussion' started by Null, Nov 9, 2019.

  1. abubin

    abubin New Member

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    I too is having this issue. The service centre checked and said timing chain tensioner is seeping. I bought the gasket and would like to DIY changing the gasket. However, cannot find any instructions on how to do this. Do I need to re-align the timing chain when taking out the tensioner? Anyone have full instructions? Appreciate any help.
     
  2. Mendel Leisk

    Mendel Leisk 'Orrible Oracle

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  3. Eddie25

    Eddie25 Member

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    You push the plunger of the tensioner in and set it with the hook on the pin... That much I'm sure.

    I may have missed it in that video, but I think the rest of the process is documented better in the first HG video (second video posted in that thread). Once installed you pull one of the timing gears till you hear a click then go the other way till you hear a click. 36:25 on the old video. I assume this is what releases the hook on the tensioner, but I'm not sure.

    Can anyone confirm that that second process above is correct?
     
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  4. Mendel Leisk

    Mendel Leisk 'Orrible Oracle

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    IIRC someone here was also talking about a trick involving a wire? I might have even salted away a link, will look.
     
  5. abubin

    abubin New Member

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    Ok, here are the information I gathered on replacing only the timing chain tensioner gasket.

    - No need to open the timing cover. Just unscrew 2 bolt on the tensioner.
    - Replace the gasket.
    - Before putting the tensioner back, push the tensioner all the way in and click the hook on the tensioner.
    - Put the tensioner back and screw the bolts.
    - Turn the chain anti-clockwise (by turning the crank) until you hear a click which means the tensioner was released.
    - done.

    What I am not sure is that can you turn the crank anti-clockwise? Isn't it dangerous to turn crank anti-clockwise as it will screw up the engine timing?

    BTW, do I have to drain the engine oil first?
     
  6. Mendel Leisk

    Mendel Leisk 'Orrible Oracle

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    One thing I do know for sure: you are well above the oil line, no need to drain oil. The oil would only be leaking out of there when the engine is running.

    Hopefully someone can confirm the rest.
     
  7. abubin

    abubin New Member

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    upload_2020-2-18_12-11-51.png

    This is from the manual. Err..are we able to "check that the plunger is extended"? Aren't the plunger inside the engine/timing chain?
     
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  8. Mendel Leisk

    Mendel Leisk 'Orrible Oracle

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    I saw that a day or two back, but could not remember which thread had posed the question, lol.

    They've still got the valve cover off (in the illustration case), maybe they're thinking to look down from above with a light.

    In your case, listen for a sound?
     
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