2010 Valve Cover Gasket Replacement

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Prius_Angie, May 28, 2020.

  1. Prius_Angie

    Prius_Angie Active Member

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    Cleaning up a newly bought $1000 white beat-up 2010 Prius with 298,000 miles. A lot of work to be done to get back on the road. I estimate this was the original valve cover & plug gaskets as they came out brittle and crispy. The spark plugs looked well past 100,000 miles.

    REMOVE IGNITION COILS.
    remove all 4x ignition coils

    VALVE COVER.
    declutter wiring surrounding valve cover
    remove 17x bolts sealing valve cover
    clean out and wipe down inside valve cover
    swap out old valve cover gasket

    SPARK PLUG GASKETS.
    remove 4x spark plug gaskets from valve cover
    using screw driver, hammer down and out 4x spark plug gaskets from outside in

    CLOSE UP VALVE COVER.

    SWAP SPARK PLUGS.
    remove and swap out 4x new spark plugs
    P_20200223_124839.jpg P_20200223_125609.jpg P_20200223_124828.jpg P_20200223_124809.jpg P_20200223_124815.jpg P_20200223_124820.jpg P_20200223_130228.jpg P_20200223_140638.jpg P_20200223_140659.jpg P_20200223_144311.jpg
     

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    #1 Prius_Angie, May 28, 2020
    Last edited: May 28, 2020
  2. The Critic

    The Critic Resident Critic

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    In addition to your instructions, there are two o-rings/gaskets for the VVT system that need to be replaced whenever the valve cover is removed. They are usually rock hard. You will see in your photo that the old gaskets were still stuck to your cover.

    Also, two small dabs of RTV are required on the timing cover-to-camshaft housing seams. This is after you carefully remove the old rtv.
     
  3. Prius_Angie

    Prius_Angie Active Member

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    You are correct sir, i must've forgot to mention the little things.
    I replaced those 2x little grommet gaskets [also came with the package] affixed to 2x long bolts, and also dabbed a few black drops of RTV on a few key points of the valve cover lip.
    thanks for the helpful reminder.
     
  4. Mendel Leisk

    Mendel Leisk Sand Pounder

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    I seem to recall someone having trouble with those spark plug gaskets, tapping in the new ones. How'd that go?
     
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  5. Prius_Angie

    Prius_Angie Active Member

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    I had to do a bit of researching, but it was straight forward-- brute force w screw drive and hammer. Just hammer "down and into" on the plug gasket from top down onto the valve cover. You will have to position the screw drive on the inner lip of 1:4 holes of where ignition coils should seal. They should pop right out with a few hammer hits. One came out easy as plug gasket was still supple and malleable; but other 3x were brittle and crispy and came out in many pieces. Glad I swapped them out, as they were way due for replacement.

    Placing them into final position was a cinch. I set them up on the inner lip from the inside valve cover, and litely hammered them into place. They 4x practically popped back into their seating. Mostly likely bc they were soft and supple of material strength.
    P_20200223_140659.jpg
     
    #5 Prius_Angie, May 29, 2020
    Last edited: May 29, 2020
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  6. Mendel Leisk

    Mendel Leisk Sand Pounder

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    Not a lot of stuff in the attached, some:
     

    Attached Files:

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  7. Prius_Angie

    Prius_Angie Active Member

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    thanks for the exploded view tutorial-- ML.
     
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  8. Prius_Angie

    Prius_Angie Active Member

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    A few more pictures & the state of 4x wet oily spark plugs, reveal my motivation to replace the valve & plugs cover gaskets.
    P_20200529_144917.jpg P_20200529_144940.jpg P_20200529_144948.jpg P_20200223_144307.jpg
     
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  9. Mendel Leisk

    Mendel Leisk Sand Pounder

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    That's astoundingly nasty. :(

    The dubious pleasures of acquiring a long-on-the-tooth used car. I suspect it was driven hard and owner rarely if ever popped the hood, relied on quickly-lube type service.
     
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  10. MikeFixes

    MikeFixes New Member

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    I am missing one of the bolts from the engine valve cover gasket. I bought my 2010 Prius used, so I have no clue what the missing bolt dimensions are.
    - I looked at the repair manual pages that your provided above and it mentions the torque specs on the 13 bolts, but I'm not sure if the all are the same size. Do you know if they are?

    @Prius_Angie since you did this work fairly recently, can you tell me if the 13 bolts from the cover are all the same size?

    Below are pics of the bolt I'm missing. It's the one spot between the spark plug connections on the engine valve cover. And, information would be great, so i can replace this bolt. Thanks
     

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  11. Mendel Leisk

    Mendel Leisk Sand Pounder

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    There's a Toyota parts website that goes into detail. I've drilled down to 2010 valve cover, here, hopefully works:


    CYLINDER HEAD. 2010 Toyota Prius Hatchback HYBRID | Toyota


    (View "extra images")

    That can give you the part number.

    That said, I would try swapping around one or two of the adjacent bolts, see if they fit at missing bolt location. Then go to dealership parts dept, taking along a few clear pics of the valve cover, show them which one bolt is missing, and a bolt that fit, just to verify. More than likely they'll have to order it, might take a few days. Bring along the part no(s) you researched too, see if parts guy agrees.

    Or wing it, take the compatible swapped in bolt to hardware store, check out their metric bolt section. If possible, check thread fit with a metric nut as well, make sure both your's and the store's bolt fit the nut.
     
    #11 Mendel Leisk, Dec 5, 2020
    Last edited: Dec 5, 2020
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  12. Mendel Leisk

    Mendel Leisk Sand Pounder

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    Should add: Toyota seems pretty good about using the same bolts whenever practical, especially on single components. Sometimes not possible, but when they can.
     
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