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Aluminum replacement for plastic rear coolant bypass joint

Discussion in '3rd Gen. Tacomas (2016+)' started by Jowett, Jan 5, 2021.

  1. Jan 5, 2021 at 2:59 PM
    #1
    Jowett

    Jowett [OP] Well-Known Member

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    Well, well, well, what do we have here? Yup, a rear coolant bypass made of the proper material for the job. Uses MLS gaskets, too. Built to take the heat!

    For the uninitiated, read following links...

    https://www.tacomaworld.com/threads/check-your-3-5l-coolant-pipe.531758/

    https://www.tacomaworld.com/threads/3-5l-rear-water-bypass-joint-leak.651341/

    The good... It bolts up. The temp sensor is correct. The not good... The coolant port for the heater core is in the wrong place. This can be dealt with fairly easily via a hose, by modifying the port outlet, or maybe both. The wire harness mounts are wrong, but look easy to deal with. There is an additional port that will need to be blocked.

    Please note, my application is a 6MT, which has no coolant hoses running to the ATF warmer/cooler. I do not know if this will be an issue on automatic equipped trucks.

    Pics, more to come.

    IMG_3986.jpg IMG_3987.jpg
     
  2. Jan 5, 2021 at 3:02 PM
    #2
    Skydvrr

    Skydvrr IG: @kalopsianick

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    Ohhh shit son! You're a parts finding, ass kickin genius
     
  3. Jan 5, 2021 at 3:03 PM
    #3
    Jowett

    Jowett [OP] Well-Known Member

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    I love scouring parts diagrams for upgrades!
     
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  4. Jan 5, 2021 at 3:04 PM
    #4
    Skydvrr

    Skydvrr IG: @kalopsianick

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    Is the plastic one off your truck? You're probably balls deep in your SC so it wasn't too bad to get to?
     
  5. Jan 5, 2021 at 3:06 PM
    #5
    Jowett

    Jowett [OP] Well-Known Member

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    Yes. The transmission is out, too, so easy access. Looks like a PITA from the top.
     
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  6. Jan 5, 2021 at 3:14 PM
    #6
    YotaKid

    YotaKid Well-Known Member

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    Shiny:eek:
     
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  7. Jan 5, 2021 at 3:16 PM
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    Skydvrr

    Skydvrr IG: @kalopsianick

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    Oh yeah you're working on the trans too. Does the exploded view show transmission lines for AT?
     
  8. Jan 5, 2021 at 3:17 PM
    #8
    shakerhood

    shakerhood Well-Known Member

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    Nice find!
     
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  9. Jan 5, 2021 at 4:01 PM
    #9
    Jowett

    Jowett [OP] Well-Known Member

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    Shows the parts, but not certain on exact hose path through the area. Ideally, someone needs to look.
     
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  10. Jan 5, 2021 at 5:21 PM
    #10
    Skydvrr

    Skydvrr IG: @kalopsianick

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    Hopefully someone will chime in. If not I'll try to look
     
  11. Jan 5, 2021 at 5:33 PM
    #11
    GBR

    GBR Well-Known Member

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    Just curious what model this came off of?
     
  12. Jan 5, 2021 at 6:22 PM
    #12
    Jowett

    Jowett [OP] Well-Known Member

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    This comes from the Lexus LS and LC 500h, which are hybrids and use the 3.5L 8GR-FXS version of our engine. It has 13:1 pistons and exhaust gas recirculation... needless to say, things run a little hotter on this engine, and this aluminum part was likely installed to deal with that extra heat.

    Part #s

    16356-31080 Joint, water bypass $119.50
    16341-31030 Gasket x 2 $8.85

    Lexus may want a vin # in order to supply this part.

    Let's get it all mapped out... it isn't done until it's done.
     
    Last edited: Aug 9, 2022 at 6:34 PM
  13. Jan 5, 2021 at 6:29 PM
    #13
    mysubiewasalemon

    mysubiewasalemon Well-Known Member

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    What did you get the parts for
     
  14. Jan 5, 2021 at 6:39 PM
    #14
    GrundleJuice

    GrundleJuice Well-Known Member

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    I think he got them for his truck....


    ....I kid, I kid.
     
    Last edited: Jan 5, 2021
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  15. Jan 5, 2021 at 7:05 PM
    #15
    Jowett

    Jowett [OP] Well-Known Member

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    List prices added above.
     
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  16. Jan 5, 2021 at 8:41 PM
    #16
    mysubiewasalemon

    mysubiewasalemon Well-Known Member

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  17. Jan 6, 2021 at 6:55 AM
    #17
    mattleg

    mattleg Well-Known Member

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    It's the same for AT as MT, the bypass line goes to the heater core first. It's only after the heater core does the AT vary by adding the warmer before returning to the thermostat.
     
  18. Jan 26, 2021 at 3:01 PM
    #18
    rlx02

    rlx02 ¯\_(ツ)_/¯

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    Any updates with this?
     
  19. Jan 26, 2021 at 3:29 PM
    #19
    Jowett

    Jowett [OP] Well-Known Member

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    I have several hoses ordered, so we'll see if there is something out there that will make this swap a little easier. Is your bypass in need of replacement?
     
  20. Feb 10, 2021 at 8:54 AM
    #20
    rlx02

    rlx02 ¯\_(ツ)_/¯

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    Mine is liveable right now, I'm just monitoring it as my coolant level is still in the middle but I definitely will need replacement in the future.
     

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