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Urgent timing help needed.

Discussion in 'Gen 2 Prius Main Forum' started by Prius92, Nov 16, 2024 at 2:14 PM.

  1. Prius92

    Prius92 Active Member

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    Engine was installed in time.
    No slack in timing chain.

    But here is what I discovered...

    [​IMG]

    Piston #1 is set to TDC, cam marks and chain line up.

    The pulley shows two holes up and down, and 3 for timing.

    [​IMG]


    But the book shows the alignment of the outer 3 holes and the inner 2 holes in different positions. This is a brand new OEM damper pulley.

    [​IMG]

    My 2 inner holes are pointing up and down, like they should, but the outer 3 holes are not.
     
    #1 Prius92, Nov 16, 2024 at 2:14 PM
  2. Hayslayer

    Hayslayer New Member

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    The damper on your car and the one in the drawing are not the same. The drawing has the "3 marks" on the right side of the hole, your damper has them on the left. There's nothing you can do to make your damper match the drawing, unless it's reversible and also has marks on the inside.
     
    #2 Hayslayer, Nov 16, 2024 at 2:22 PM
  3. Prius92

    Prius92 Active Member

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    Looking at other used dampers, a lot of them don't match up, some are WAY OFF. Which is really odd because those outer marks are supposed to be for setting the timing in inspection from what I showed from the book.
     
    #3 Prius92, Nov 16, 2024 at 2:24 PM
  4. Hayslayer

    Hayslayer New Member

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    My damper doesn't even have the "3 marks", only has the 2 holes
     
    #4 Hayslayer, Nov 16, 2024 at 2:32 PM
  5. Brian1954

    Brian1954 Senior Member

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    The three drill points are not for timing. I am guessing that they are for balancing the pulley. The timing mark is the notch on the outside diameter of the pulley, as should in the zoomed in circle in the right side of the diagram that you posted.
     
    #5 Brian1954, Nov 16, 2024 at 2:41 PM
  6. Prius92

    Prius92 Active Member

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    Well it appears to be in time then. I have no clue what else it could be other than a bad cam phaser?
     
    #6 Prius92, Nov 16, 2024 at 2:44 PM
  7. Brian1954

    Brian1954 Senior Member

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    It is very hard to see the notch in the OD of the pulley in your picture, but it does not seem to be at TDC. Can you post a new picture taken more at the top of the pulley showing the notch?
     
    #7 Brian1954, Nov 16, 2024 at 2:54 PM
  8. Tombukt2

    Tombukt2 Senior Member

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    That's correct those marks are for balancing the pulley they have nothing to do with anything to set timing engine or anything those three dots could be anywhere on the pulley If you get an aluminum light white one it won't have any at all I don't think they make them for the one NZ. But they do for other vehicles and I have them on some vehicles. All your concerned about is the notches that are ground on the very outer part of the v and of course whatever timing marks are on the chain and are on the sprocket looks like you're good to go You should be running and driving not worrying for the most part everything looks pretty spot-on.
     
    #8 Tombukt2, Nov 16, 2024 at 4:35 PM
  9. Prius92

    Prius92 Active Member

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    Here is the pulley set to 0 (well as close as I could get it).

    [​IMG]
    and the marks.
    [​IMG]
     
    #9 Prius92, Nov 16, 2024 at 6:47 PM
  10. Brian1954

    Brian1954 Senior Member

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    Thank you for the pictures. Yes, it looks good. The earlier picture was hard to tell if it was at TDC.
     
    #10 Brian1954, Nov 16, 2024 at 6:51 PM
    Tombukt2 likes this.
  11. mr_guy_mann

    mr_guy_mann Senior Member

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    That looks...ODD.

    The service manual shows setting the timing alignment using the colored links at 20° ATDC. If the crank was AT 0° I would expect the camshaft sprocket marks to be "perfectly" at 12 o'clock relative to the cylinder head surface.

    Judging by the small bolts on the front of the VVT actuator, it looks to be advanced - 1 tooth clockwise- from that. The "left" bolt appears to be mostly above the head surface and the "right" is below. It seems to match the diagram in the manual at 20°, but the crank is at 0°.

    Personally I have never had to do chain work on a Gen2, maybe someone who has can chime in on those pics.

    Screenshot_20241117-120131.jpeg

    Posted via the PriusChat mobile app.
     
    #11 mr_guy_mann, Nov 17, 2024 at 12:11 PM
    Last edited: Nov 17, 2024 at 1:32 PM
  12. mr_guy_mann

    mr_guy_mann Senior Member

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    Here's what I mean. At 0° I would expect the intake notch to be at the yellow mark, and both red and blue bolt heads to be even with the head surface. The top bolt would in line with the green mark.

    Since the colored links look "ok", both cams could be off. cam%20alignment.jpeg

    Posted via the PriusChat mobile app.
     
    #12 mr_guy_mann, Nov 17, 2024 at 12:22 PM
    Last edited: Nov 17, 2024 at 1:38 PM
  13. Prius92

    Prius92 Active Member

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    I'm wondering if perhaps the timing gear or what is called the "cam phaser" has messed up?
    [​IMG]

    This is a photo of the timing before the engine was finished being put together.

    Now you can see on the exhaust cam, the dots are pretty much in the same spot, but the intake cam spot has shifted about 4-5 degrees to the right.

    You can see the slant of the "II" mark on the exhaust cam bolt head is exactly the same angle as it was before it was ever started back up.

    [​IMG]

    So what happened? It's obvious by the way things line up, that the engine didn't jump timing.
     
    #13 Prius92, Nov 19, 2024 at 3:39 PM
  14. Prius92

    Prius92 Active Member

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    This is not making any sense.
    I took a pic of the cams lined up.
    [​IMG]

    The default orientation of the phaser is aligned with the the markings on the exhaust cam.

    But now, the dampening pulley is showing by way of the mark on it, that the timing of the crankshaft is not 0 anymore.

    Keep in mind, this error popped up after the engine ran about 30-45 minutes. It comes back on almost instantly.
    The P0016 was not originally occurring.


    It looks like the crank has moved about 8 degrees out of time.

    [​IMG]


    Here is the mark aligned when before the engine was installed. I rotated it a bunch of times to make sure it did not go off track.

    [​IMG]

    Now it would be explainable that the chain has jumped and has made the timing of the crank 8 degrees off, but that would also make the chain markings and the alignment of both cams off as well. This has not occurred.
     
    #14 Prius92, Nov 19, 2024 at 4:57 PM
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