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Gen 3 Prius timing

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Garra671, Nov 9, 2020.

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  1. Garra671

    Garra671 Junior Member

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    I’m replacing my headgasket. And I’m
    Just at about the removing of the timing cover. Valve cover. Etc etc etc.

    My question is in regards too the timing. Do I have too re-time the engine and lock the cams with a piece of folded up paper, before removal of the timing chain?

    or can I skip both of those steps. And just time the engine (matching orange links and notches). when I’m reassembling it after?
     
    #1 Garra671, Nov 9, 2020
  2. Tideland Prius

    Tideland Prius Moderator of the North
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    Gen 3 Prius or Gen 1 Prius v? You put Prius v in your profile.
     
    #2 Tideland Prius, Nov 9, 2020
  3. Mendel Leisk

    Mendel Leisk Senior Member

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    My totally uneducated opinion would be to do all the steps, locking the cans per the gasket masters' video.
     
    #3 Mendel Leisk, Nov 10, 2020
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  4. Garra671

    Garra671 Junior Member

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    Gen 3. Sorry. I’ll specify better on my profile as well.
     
    #4 Garra671, Nov 10, 2020
  5. cnc97

    cnc97 Senior Member

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    You don’t necessarily have to lock the cams on disassembly. However, I do recommend aligning the timing marks before you take off the tensioner. This will show how much wear has occurred to the timing setup. Since you have to take it off anyway, it’s a great time to replace it all. I think the paper in the cam cap to lock it was overkill, but to each there own.
     
    #5 cnc97, Nov 10, 2020
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  6. Tideland Prius

    Tideland Prius Moderator of the North
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    Thanks. It just helps me move your thread to the appropriate section :)
     
    #6 Tideland Prius, Nov 10, 2020
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  7. Garra671

    Garra671 Junior Member

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    follow up question if you don’t mind. The pulley bolt. I read somewhere the AC bolts can be used to lock the pulley. But other than that. The only way too do it, is with a pulley locking tool?
     
    #7 Garra671, Nov 10, 2020
  8. Mendel Leisk

    Mendel Leisk Senior Member

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    IIRC Toyota makes a special tool for this. If you google this maybe you can find some pictures and could reverse engineer something.
     
    #8 Mendel Leisk, Nov 11, 2020
  9. cnc97

    cnc97 Senior Member

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    I used an impact wrench to remove mine. And I am not ashamed to say that I reinstalled it the same way.
     
    #9 cnc97, Nov 11, 2020
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  10. Garra671

    Garra671 Junior Member

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    69690BD5-1FE0-4DE6-917D-D29457D3B43D.jpeg 4C4E8010-3813-4EB5-AB51-AFEECCE72AB6.jpeg 978149D9-91F2-4698-A87B-8862F9033C58.jpeg 3A65616F-2685-4FD8-A110-3EF4F8D45C51.jpeg I want to be sure my timing marks are accurate before further disassembly.

    As well The timing sprocket on left hand side , has a small rectangle at very top middle orange link. And left side middle of sprocket has another rectangle with small dot.
    (Sorry not super visible in pics).


    As well. I can feel a small bit of resistance when I go back or forth more than 10-15degrees. From this specific point I’m at.


    so I just want to be sure I’m not opening something and closing the other when it should be reversed...
     
    #10 Garra671, Nov 12, 2020
  11. Garra671

    Garra671 Junior Member

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    11D605A4-656F-4A04-908C-490C013CD629.jpeg D8D8585C-FFDE-4A79-A209-F7E2A4965DD4.jpeg 7FC2122B-CFC9-4A6C-8D70-F5B405A9639D.jpeg 0F5C3F80-23C2-4261-9144-48107A798FA6.jpeg Sorry for posting this in multiple locations. Just trying to cover my basis so I can hopefully
    Have some replies tomorrow.



    I want to be sure my timing marks are accurate before further disassembly.

    As well The timing sprocket on left hand side , has a small rectangle at very top middle orange link. And left side middle of sprocket has another rectangle with small dot.
    (Sorry not super visible in pics).


    As well. I can feel a small bit of resistance when I go back or forth more than 10-15degrees. From this specific point I’m at.


    so I just want to be sure I’m not opening something and closing the other when it should be reversed...
     
    #11 Garra671, Nov 12, 2020
  12. cnc97

    cnc97 Senior Member

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    The engine is not timed correctly. The resistance is valve-to-piston interference. Remove the tensioner, loosen the cam bridge bolts and retime the engine before continuing.
     
    #12 cnc97, Nov 12, 2020
  13. cnc97

    cnc97 Senior Member

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    I misread your post. It’s not required to have the marks aligned on disassembly. You can disassemble it as is. As soon as you loosen the cam bridge bolts(the larger ones, not the smaller), the valves no longer react to the cam turning.
     
    #13 cnc97, Nov 12, 2020
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  14. Dxta

    Dxta Senior Member

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    To confirm if its properly timed, loosened up cylinder number 1 spark plug first, put a long screw driver in there, and hand turn the crankshaft pulley 360°, until the screwdriver, does not go UP or DOWN again. That way, it's already in TDC. Ensure the crankshaft pulley is at the zero mark. Afterwards, you get a white marker, to mark off where the camshaft sprockets and chain links meet on either camshaft sprockets.
     
    #14 Dxta, Nov 12, 2020
  15. Garra671

    Garra671 Junior Member

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    why is the timing not correct? All the marks are in the correct places no?

    43C3ACF3-C6DB-4CE7-8415-8C573D2D7620.jpeg 4E65D001-D89E-4D69-ADEB-FF1D8C5AF0D3.jpeg
     
    #15 Garra671, Nov 12, 2020
    Last edited: Nov 12, 2020
  16. Garra671

    Garra671 Junior Member

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    I followed the service manual photos. (Pictured in above reply).

    the 2 marks line up with the orange links on both sides. And the yellow dot on pulley is at 0 mark.

    If I move the pulley left or right off of 0 mark. Then #1 cylinder begins to go down again. And I feel a bit of resistance.
    So I believe it’s currently at TDC?
     
    #16 Garra671, Nov 12, 2020
  17. Dxta

    Dxta Senior Member

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    As long as you've those marks lined up, you're good to go.
    Have you also confirmed the camshaft lobe orientations as shown in the manual with what you've presently?
     
    #17 Dxta, Nov 12, 2020
  18. Garra671

    Garra671 Junior Member

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    That’s literally what I was about too ask about. The dimples/dots it shows on the cams near the lobes.

    The exhaust cam the dot is more leaning too the left side.

    And the intake cam, I don’t see any dot at all. I rotated it around too be sure it wasnt hiding. But no dots at all on that cam. I’ll double check tho too be sure.



    just thought to myself. Do you think the dot it shows near the lobes, are too tell you where the lobes should be pointing? Not an actual marker dot?

    from the videos and such I’ve seen. Everyone references the orange links and the 0 mark. But never mentions those dimples on the cams themselves.



    sorry for long reply!!!
     
    #18 Garra671, Nov 12, 2020
  19. Mendel Leisk

    Mendel Leisk Senior Member

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    Maybe follow the gasket master video technique: put a triple thickness of shop towel over intake and exhaust cam shaft bearings at one location and snug them back down. It's easy to do, might save grief later.

    No offense, but posting in multiple locations is a PITA for responders and you. This forum is really just for intros. A technical question like this should be posted once, say in third gen maintenance forum.
     
    #19 Mendel Leisk, Nov 12, 2020
  20. Garra671

    Garra671 Junior Member

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    putting the towel in. Is too lock the cams in place after timing has been set. I’m looking to confirm if my timing is correct. before the next step.


    And yes I know it’s annoying to post multiple locations. But when posting in technical. I didn’t get any replies.
     
    #20 Garra671, Nov 12, 2020
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