New cylinder head - what's in the box

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Alexikor, Jul 4, 2026 at 5:20 PM.

  1. Alexikor

    Alexikor Junior Member

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    Hi all,

    I'm wondering if those who have replaced the cylinder head with a new one from Toyota could share more about what's in the box. The part I'm referencing is 11101-39725 which looks like it's just the cast aluminum head and doesn't include any camshaft components, any valve components, and, potentially, no spark plug tubes.

    If tubes aren't included then what's their part number? The repair manual refers to the tubes as "spark plug tubes", but no parts show up on parts websites if you search with that as the keyword.
     
    #1 Alexikor, Jul 4, 2026 at 5:20 PM
  2. BiomedO1

    BiomedO1 Senior Member

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    You've still got those low tension piston rings to deal with - so if your replacing it because of excessive oil burn. That's not going to help much.
     
    #2 BiomedO1, Jul 4, 2026 at 7:11 PM
  3. Tombukt2

    Tombukt2 Senior Member

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    Usually you move your cams over if there's no flat spots and everything looks good usually they pretty much do and spark tubes same channel lok pliers they come rt out if needed a bit of kroil .
     
    #3 Tombukt2, Jul 4, 2026 at 7:21 PM
  4. Alexikor

    Alexikor Junior Member

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    not keen on reusing the spark tubes if the manual explicitly says not to reuse them. i'll continue my search
     
    #4 Alexikor, Jul 4, 2026 at 9:16 PM
  5. Tombukt2

    Tombukt2 Senior Member

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    Never seen that in the manual thanks for the reference and I've reused spark to plug tubes in 2z 1 z and quite a few other Toyoda engines from late 70 forward 2tc had them or they may have been built into the valve cover actually on that engine but many Toyotas have had them they generally thread in I have not seen the not reuse statement . Ever. But I don't spend a lot of time reading either.
     
    #5 Tombukt2, Jul 5, 2026 at 11:52 AM
  6. Tombukt2

    Tombukt2 Senior Member

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    I've also lived in places that are so far away from civilization that pretty much there's no choice but to reuse by the time you get the new tubes you have been sent far away again .
     
    #6 Tombukt2, Jul 5, 2026 at 11:53 AM
  7. Mendel Leisk

    Mendel Leisk MMX GEN III

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    Feeding that number in on Amayama, looks like the spark plug tubes, and a few other items, are included:

    upload_2026-7-5_8-59-48.png
    LINK

    If you don't mind, what's the story on the car, miles, how long you've had it, why are you thinking to replace cylinder head?

    (Shipping cost to me, on west coast Canada, is shown as $30 CDN. That seems a little preposterous, suspect it'd end up being at least $100~200.
     
    #7 Mendel Leisk, Jul 5, 2026 at 12:02 PM
    Last edited: Jul 5, 2026 at 12:08 PM
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  8. Tombukt2

    Tombukt2 Senior Member

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    And this is a brand new head provided by Toyota or a remanufactured assembly also done by the Toyoda system?
     
    #8 Tombukt2, Jul 5, 2026 at 12:14 PM
  9. Alexikor

    Alexikor Junior Member

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    Holy cow those illustrations on Amayama's website are 1000x better than those in the manual and toyota parts websites.

    No intent to replace the cylinder head yet. I'm estimating what it would cost to replace the engine with as new as parts as possible if (potentially when?) the head gasket goes. Current plan:

    Necessary: ~ $3,400
    • New short block
    • New cylinder head
    • New water pump
    • New thermostat
    • Engine gasket set
    Optional: ~ $450
    • New oil pump
    • New Chain guide
    • New Timing chain tensioner
    • New valve seals
      • Take note of condition of valve train during disassembly

    Chocking it up to good fortune that at 223,000 miles, i haven't had any classic symptoms. Piston heads black, no weeping coolant during compression test, no loss of coolant from reservoir, no harsh knocking sounds, just a mystery gravelly buzzing as described in my other thread
     
    #9 Alexikor, Jul 5, 2026 at 12:21 PM
    Last edited: Jul 5, 2026 at 12:30 PM
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  10. Alexikor

    Alexikor Junior Member

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    from what i can tell in the descriptions, the parts are new. The total cost is about 2-3x the cost of a used (ie junkyard) engine, and it still requires a fair amount of labor. But I have a good feeling it will last 2-3x longer than a junkyard engine especially now I know how to take care of it better.
     
    #10 Alexikor, Jul 5, 2026 at 1:57 PM
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