Updating piston rings, what else to do while there?

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Wtfdustinwtf, Mar 15, 2026 at 9:36 AM.

  1. Wtfdustinwtf

    Wtfdustinwtf Junior Member

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    2014 burning through oil a lot. I finally decided last second to hoist out the engine put it on a stand tear it down update the rings+ new headgasket +machining. I started this project last second as the funds tools and free time are all here for a short window. I know enough and have enough saved manual excerpts and saved videos to proceed. However I've never tore down and engine before and don't exactly know what else might be worth doing while the engine is out. I have the OEM headgasket kit 10 head bolts and updated rings. Is there any thing else I should get and do? I know nothing about if valves need lapped or springs need any special attention. Any advice tips or general knowledge would be greatly appreciated.
     
    #1 Wtfdustinwtf, Mar 15, 2026 at 9:36 AM
  2. Brian1954

    Brian1954 Senior Member

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    #2 Brian1954, Mar 15, 2026 at 9:59 AM
  3. Mendel Leisk

    Mendel Leisk MMX GEN III

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    The revised rings require the revised pistons, part nos in attached.

    this 3-part video is quite thorough:





     

    Attached Files:

    #3 Mendel Leisk, Mar 15, 2026 at 11:36 AM
    Last edited: Mar 15, 2026 at 11:48 AM
  4. rjparker

    rjparker Tu Humilde Sirviente

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    I would send the head to an automotive machine shop for inspection and repair if needed. Some warn of taking too much surface off if warped due to potential timing issues.

    The number one problem we hear about is the timing chain off by a tooth requiring rework. Follow Toyota's instructions to the letter including the short reverse rotation to release the tensioner.

    Leaks at the timing chain cover happen but if you do yours engine out it should be easier to do right. Unless you have the engine in the car again and then find the timing is off.

    Others fail to reconnect all hoses or connectors.

    Still others spill coolant into the ac connectors causing problems since high voltage to the compressor is shutoff when any ground conduction occurs. Sort of like a built in gfci.

    Allow plenty of time. You are bound to need more tools and parts.
     
    #4 rjparker, Mar 15, 2026 at 11:53 AM
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