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Gen 2 engine rebuild thread.

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Prius92, Apr 25, 2023.

  1. Prius92

    Prius92 Member

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    I can't source a 9mm triple square socket to remove the headbolts any freaking where.
    Not Napa, Autozone, Oriley's or Advance, tool stores, etc.

    Got the cams off, what are these grind marks? They are no where near any rotating part.

    Fullscreen capture 4252023 21501 PM.bmp.jpg


    I also can't figure out how to take the "clutch" off.
     
  2. ChapmanF

    ChapmanF Senior Member

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    You might have better luck looking for the correct tool, a 10 mm double-hex. There's one in this set:

    https://ctatools.com/products/9295

    [Edit: I copied most of the info here from a Gen 3 post, where the correct tool for the 2ZR engine is a 10 mm double hex. I just looked in an old Gen 1 manual for the 1NZ instructions, and it says 8 mm double hex is the right tool there. So there is probably a similar situation where people sometimes use a 9 mm triple square and it kinda fits.]

    When people use the wrong tool, the wrong tool they usually use is a 12 mm triple-square. Triple square and double hex have the same number of points, of course, and the 12 triple-square kinda fits, but if you draw both you can see the triple-square is too pointy, and won't engage the sides of the head bolt recess as well as the correct 10 mm double hex.

    [​IMG]

    When you say the "clutch", what part do you mean, and why do you want to take it off?
     
    #2 ChapmanF, Apr 25, 2023
    Last edited: Apr 25, 2023
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  3. Mendel Leisk

    Mendel Leisk Senior Member

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    For second gen, Toyota recommends an 8mm bi-hexagon wrench:

    upload_2023-4-25_13-55-16.png

    Attached is the full engine chapter from Repair Manual:
     

    Attached Files:

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  4. Prius92

    Prius92 Member

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    The clutch/plate bolted to the crankshaft when you yank the engine off. It makes it harder to use my engine stand.
     
  5. Prius92

    Prius92 Member

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    It really grinds my gears no one locally sells the tool to take the head bolts out.
    Also the fact Toyota decided to use some goofy hard to find head rather than a typical 6 or 12 pt bolt head used on dozens of different engine types.
     
  6. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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  7. Mendel Leisk

    Mendel Leisk Senior Member

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    At least you can mail order:

    8mm double hex
     
  8. ChapmanF

    ChapmanF Senior Member

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    The transmission input damper is bolted to the flywheel with six bolts near its outer circumference.

    If, with the damper off, the flywheel is still in the way of your engine stand, the flywheel is bolted to the crankshaft, with six bolts clustered in near the center. That's a pretty critical joint, with torque requirements, I don't remember if the bolts are supposed to be reused, etc.

    But it seems to me that the appeal of an engine stand is in how it makes working on the engine convenient for you, and if yours is going to make you take off an input damper and flywheel just to use it (assuming you don't otherwise have some reason to be taking those off), it's not really contributing much to convenience.

    Can you buy some longer mounting bolts and, say, pipe nipples (for rigidity) and mount the engine the damper's depth away from the stand?
     
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  9. Prius92

    Prius92 Member

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    Ugh, you need special tools to remove the crank and main bolts too, as well as the oil filter union.
     
  10. Prius92

    Prius92 Member

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    Took some pics of the cam bearings, a couple have some thin lines, a couple others have tiny pock marks. I know the lines are wear, but what would cause pock marks in the bearing itself?

    Also..did they not use gaskets at the factory? A lot of stuff was RTV'ed on.

    IMG_8974.JPG

    IMG_8975.JPG
     

    Attached Files:

  11. alftoy

    alftoy Senior Member

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  12. Prius92

    Prius92 Member

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    Well I found out part of the issue. Inside the oil pickup screen was a folded up piece of foil, roughly the same size as the one on a 5 quart jug of oil. It covered about a third of the screen, and may have lead to some oil starvation issues.

    I found the right bit from Snap on, $62 shipped. I'd rather use name brand than something from China that could break off.

    Showed the bearing caps to an engine tech, he said the little pock marks would of been from contaminated oil, and really should not hurt anything.
     
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  13. TMR-JWAP

    TMR-JWAP Senior Member

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    Having not yet popped apart a Gen 2 engine, the caps themselves are the bearing surface? They're aluminum? Seeing the wear marks/burrs/pits, are you concerned about roughness? It looks like some of the scratches have burs at the end or does it only look rough in the photo?

    Are the journals scored also?
     
    #13 TMR-JWAP, Apr 26, 2023
    Last edited: Apr 26, 2023
  14. Prius92

    Prius92 Member

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    I'll take a look later. The pits are not sticking out. The camshafts themselves seem fine.
     
  15. TMR-JWAP

    TMR-JWAP Senior Member

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    Just a warning, lol...I'll be following this thread and may have a lot of questions because I recently purchased a nice little 2009 Touring with an engine that failed due to oil starvation. It's actually seized. I'll likely be doing an engine swap, but still exploring options. Unfortunately its a bit down my 'to do' list for at least a few months. I have one more car to do a brake actuator and then a dozen other minor jobs on that car and the one I did the actuator on last weekend. Busy busy busy, but looking forward to the engine job!
     
  16. Prius92

    Prius92 Member

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    Got a engine and transxaxle for $400, 260k miles, but it's actually externally cleaner than mine.

    My engine is prob done for. Took the crank off and the pistons have no tightness in the bore. In fact the oil control rings are carbon FREE, and the exhaust ports have tons of carbon from blowby.

    I don't think the plugs were EVER changed on this other engine.
    Fullscreen capture 4262023 80544 PM.bmp.jpg

    This also does not look good. But it turns over fine with the plugs out.
    Fullscreen capture 4262023 80526 PM.bmp.jpg

    I'm thinking maybe water got in it wile it was sitting.
     
  17. Prius92

    Prius92 Member

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    Got all the parts ordered.
    DNJ Timing kit: $72.61 shipped.
    Ring Set (Toyota OEM) $92.17
    Full Head Gasket Set with Bolts: $69
    Reman fuel injectors (flow tested) $32.99

    Need a couple little things like the front and rear main seals.

    So $266 for all the parts, $400 for the other engine, plus it came with the trans-axle which I can hopefully sell.

    We're at $666, I'm going to do all the rebuilding myself, other than the shop stuff (valve grinding, cleaning, honing), which is going to run around $300-$400.

    We'll have a pretty much new engine for $1100.
     
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  18. SFO

    SFO Senior Member

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    Please create a thread, and post more of those quality pictures so that we can follow the rebuild.
     
  19. Mendel Leisk

    Mendel Leisk Senior Member

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    Or just revise the title on this one?
     
  20. Prius92

    Prius92 Member

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    Does not look like it will let me revise the title. If a mod wants to, rename it to:

    Gen 2 engine rebuild thread.
     
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