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Engine swap question

Discussion in 'Gen 3 Prius Technical Discussion' started by cnc97, Jun 29, 2018.

  1. cnc97

    cnc97 Senior Member

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    One note to anyone else that sees the post and wants to do this. The “port” below the VVT solenoid is just the post the engine cover sits on. It is not open to the inside of the valve cover.
     
  2. Rmay635703

    Rmay635703 Senior Member

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    That’s why I go to a decent U-pull, they aren’t always the cheapest but I pull what I want, how I want, run it by them on the way out, usually ends up cheaper because they don’t needlessly pull stupid stuff off damaging seals that they will never sell anyway.
     
  3. Mendel Leisk

    Mendel Leisk Senior Member

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    @cnc97 This is a 4th gen engine? The EGR mount will likely need some adapting, just of top of my head. Good luck with this project. (y)
     
  4. cnc97

    cnc97 Senior Member

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    Yes. Gen 4 engine. There are open threaded holes on trans end of the engine. The Gen 3 engine in my car has studs in the open holes. Looks like just moving the studs around. All the sensors look to be in the same places with same connectors. I won’t be able to use the Gen 3 engine cover. And they could not find the Gen 4 cover that came off the one I bought.
     
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  5. cnc97

    cnc97 Senior Member

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    I did pull the oil filter out of this engine. Very clean. Appeared to be OE filter. No debris in the oil that drained out. I saved it in a clean mason jar and poured it over a magnet. Since I’m putting 3, maybe four days into this, I wasn’t taking any chances.
     
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  6. cnc97

    cnc97 Senior Member

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    Gen 4 coils are plug and play on the Gen 3. I pulled one off the Gen 4 I bought and plugged it in to my car. It fired across the plug gap. There is plenty of wiring as the Gen 3 coil for cylinder 4 is canted, but the Gen 4 coils have the connector pointing straight rearward.
     
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  7. Aaron Vitolins

    Aaron Vitolins Senior Member

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    Your
    You're my hero! I'm so excited for this project! My father and I replaced my sisters 2010 engine due to headgasket failure and high oil consumption. We bought a very low milage prius plug in engine. Runs great and wasn't too terrible of a job. I'll be sooo interested to see what type of mpg you'll get with the updated 1.8! Beyond happy!
     
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  8. cnc97

    cnc97 Senior Member

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    The yard told me 8100 miles on the 17 this engine is out of. The plugs look great and the oil was very clean. I have not found any reason to doubt them yet. Looking at mine, I think I will have to reuse my intake, as they broke the map sensor off of the donor engine. Surprisingly they only cut the two hoses feeding the heater core. Every other coolant hose connection was just taken apart.
     
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  9. cnc97

    cnc97 Senior Member

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    So the following realization just came to me. I want/need to get this done so I can take it to the local Toyota dealer for service. So I can see if they notice my Gen 3 has the heart of a Gen 4.

    I think I might let them change the trans fluid just for kicks
     
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  10. Shane Burns

    Shane Burns Member

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    Following. I’m getting excited on your engine swap!
     
  11. Grit

    Grit Senior Member

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    Im rooting for ya, and may follow suit.
     
  12. cnc97

    cnc97 Senior Member

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    At 430pm on Tuesday the fun begins. I don’t have to be back to work until Friday morning. Weather looks to be in my favor. I’ll be so glad to get my car back together.
     
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  13. Mendel Leisk

    Mendel Leisk Senior Member

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    Have to say, I'm waiting for the "pin to drop" as the Brits say, when things don't fit up, due to 3rd vs 4th gen variations. The EGR connection will be interesting, not sure how that's going to work. That said, think good thoughts, hopefully you can "engineer" through any difficulties. (y)
     
  14. cnc97

    cnc97 Senior Member

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    Since the yard took the EGR cooler and manifold with converter, I’ll be reusing the Gen 3 items. Looks to be moving a couple of the studs around to bolt things back up. I have all the engine sensors except the MAP sensor that they broke off of the manifold. I looked into getting that sensor, but I will just reuse the Gen 3 intake. Im 92.5% sure that things will go according to plan. I still have a few things to look into, but I have to wait until my car is apart to see if things are going to work. The exhaust gasket matched the new one I had at work. If I didn’t have to work tomorrow, I’d get started tonight. I know that if I start, I won’t quit until it’s running.
     
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  15. mjoo

    mjoo Senior Member

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    That should be the least complex plan. I'd try bolting on 3rd Gen exhaust and intake manifolds and EGR system to new engine externally to test for fitment. Once tested strip it down again and install the new engine.

    It shouldn't take more than a half hour to test with a cordless drill/ impact wrench.

    Pixel XL ?
     
  16. cnc97

    cnc97 Senior Member

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    I can literally have the intake off in 10 minutes without electric tools. The exhaust will be a little more challenging. Going to work on that tonight a little bit.
     
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  17. cnc97

    cnc97 Senior Member

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    The intake does fit. There are some adjustments that would be required to use the Gen 4 intake. So I will use the Gen 3. Looks like I will have to change over the oil dipstick tubes between engines.

    Since I had the wiper cowl off, I held my phone down and got a pic of the hole in my block. I can tell you that my engine threw enough oil to overwhelm my OCC. It was full along with my hoses going to it.
     

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  18. cnc97

    cnc97 Senior Member

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    Absolutely bolting Gen 3 manifolds to it for photo op before installing the engine. If anyone seeing this has suggestions of pics to take, send me a PM or post them here. The more information I can provide will only help the next person doing their own swap.
     
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  19. padroo

    padroo Senior Member

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    Looks like a big difference in the intake manifold design, I wonder why?
     
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  20. cnc97

    cnc97 Senior Member

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    I know that where I had my OCC hoses routed interfered with intake. And oil dipstick tube is bent differently. As far as design, I don’t know. Does anyone with a Gen 3 have the “replacement” intake noted on the TSB for the startup knock?