2016 Prius Transmission bolt sizes? Drain,fill

Discussion in 'Gen 4 Prius Technical Discussion' started by Brandon Kennedy, Apr 7, 2019.

  1. Brandon Kennedy

    Brandon Kennedy Junior Member

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    Hello! I know it takes 3.8 quarts of fluid (using genuine Toyota.) Its at 68k miles figured I'd do a drain and fill... already did the coolant.

    What size allen are the drain and fill? I was going to buy a whole set but wanted to make sure it will be included In the set....

    I already found out the oil filter needed a tool lol.
     
  2. Georgina Rudkus

    Georgina Rudkus Senior Member

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  3. Brandon Kennedy

    Brandon Kennedy Junior Member

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    Are you sure? I thought tried a 15mm allen and it was to small for the inside?
     
  4. Georgina Rudkus

    Georgina Rudkus Senior Member

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    Yes....They are all 10mm. Toyota part number for the plug is 90341-18016.
     
  5. Georgina Rudkus

    Georgina Rudkus Senior Member

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    Then, you are working on the wrong plug.
     
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  6. Brandon Kennedy

    Brandon Kennedy Junior Member

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    I know the bolts surrounding the case are 10mm, I'm needing the drain and fill plug sizes, their the only 2 that are allen inserts and their the only one on the top side of the case and bottom which is where the drain and fill normally are.
     
  7. Brandon Kennedy

    Brandon Kennedy Junior Member

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    Never mind lol I looked back at the picture maybe it was smaller than I remember
     
  8. Mendel Leisk

    Mendel Leisk Sand Pounder

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    This should help:
     

    Attached Files:

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  9. Brandon Kennedy

    Brandon Kennedy Junior Member

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    It did! Thanks for both of your help! And sorry for me thinking/getting it wrong lol. I was way off. Have a allen set ordered and a pump to pump the fluid in. Thanks again!!
     
  10. Mendel Leisk

    Mendel Leisk Sand Pounder

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    Funnel with hose extension (roughly 3 foot) from above is easy. Trickiest part is just snaking the hose through. Keep a drip pan underneath, pour 3 quarts/liters quickly, then go 100 cc at a time, let it run through each time, till it starts dripping back out.

    I read in some other document: the Toyota ATF WS shouldn't be kept long term, once opened. Not sure how critical it is, and before I read that I did use up some remainder from an earlier change. Still it's not a lot, maybe best to recycle the left over.

    The pdf instructions to run the engine and recheck the level. At least with my third gen, I found no change, only did that the first time. Also, I think if you managed to put in roughly the spec amount (3.6 liter or 3.8 quarts), and the level is right at the lip of the fill hole, you're good.
     
  11. Georgina Rudkus

    Georgina Rudkus Senior Member

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    Home Depot has 10mm 3/8 drive sockets for about $2-2.50.
     
  12. Brandon Kennedy

    Brandon Kennedy Junior Member

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    I will probably end up losing that other .2 quarts somehow knowing me so theres that lol. I decided to cancel my amazon order since I can do the one size at home depot for $2-$3. Thanks for that heads up! I didnt even think to do that lol. Thanks again!!! :)
     
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  13. Mendel Leisk

    Mendel Leisk Sand Pounder

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    Funnel from above is easier with a helper. They pour, you lie underneath, and at some point start screaming "StopStopStop...".
     
  14. jerrymildred

    jerrymildred Senior Member

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    Interesting. I wonder why in step 2 (d) they say to reinstall the fill plug and old gasket and then in the next step, 3 (a), they say to remove the fill plug and gasket. Is that because they think you'll need a nap between draining & filling and don't want bugs to crawl in there? :)

    Anyway, it does a good job of showing how simple the process is. I'll save the document for the torque specs since I plan to change mine after our vacation trip. Thanks, Mendel.
     
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  15. Raytheeagle

    Raytheeagle Senior Member

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    37 ft lbs is 10 pounds higher than the Gen3 ‘s torque spec;).

    Good to know(y).
     
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  16. Mendel Leisk

    Mendel Leisk Sand Pounder

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    Yeah, didn't notice that. There's no mention of the temporary reinstall of fill bolt in 3rd gen. Yeah maybe they really want to keep it closed up as much as possible? I've read in some TSB (which escapes me) that you should not use ATF WS from bottles that have been previously opened and then stored. Kinda like brake fluid I think.

    Attached is third gen instruction, for your ref.

    (2nd gen Repair Manual has no instruction for transaxle fluid change, btw.)

    That I did notice, and my first thought: it's gonna be even MORE of a bear to break loose. Third gen is 29 ft/lb IIRC.

    When you remember transaxle torque value, it's maybe a sign it's time to trade-in, lol?

    Honda uses 3/8" square socket head cap screws for all these, btw. Not sure if it's superior, maybe less prone to rounding? It's certainly easer: just use a 3/8" drive ratchet (or 1/2" with reducer), with extensions as needed.
     
    #16 Mendel Leisk, Apr 21, 2019
    Last edited: Apr 21, 2019
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