What parts should be replaced when getting a used "low mile" JDM engine swap, if any?

Discussion in 'Gen 3 Prius Technical Discussion' started by ThemOklahomaBoys, Aug 17, 2021.

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  1. ThemOklahomaBoys

    ThemOklahomaBoys New Member

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    Getting a swap of a used JDM Gen 3 Engine in my 2012 due to misfire caused by leaking head gasket.
    Should I replace things like the spark plugs, rear main seal or ANYTHING ELSE if the new jdm engine supposedly only has 49k on it?
     
    #1 ThemOklahomaBoys, Aug 17, 2021
  2. bisco

    bisco cookie crumbler

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    nothing, if you trust the miles. maybe pull a few things like a plug to see if the miles seem right.

    definitely clean the egr circuit and think about an oil catch can.

    might be a good time to reseal the timing chain adjustment cover
     
    #2 bisco, Aug 17, 2021
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  3. SOPHOMORE

    SOPHOMORE New Member

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    Water pump, T-stat since its already out. Yours is old, and you don't know when the last time the one on the JDM motor was ran.
    Valve cover gasket since it's easy why the motor is out.
    Oil pan reseal/swap if the one on the JDM motor is dented from storage.
     
    #3 SOPHOMORE, Aug 31, 2021
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  4. working1

    working1 Active Member

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    I'll be doing something similar in the next couple of weeks, except using a salvage yard 2014 engine with 80K. My replacement parts list is pretty extensive:

    AISIN WPT190 Water Pump
    AISIN WQT001 Water Pump
    AISIN ACT002 (ACT-002) Coolant / Antifreeze
    AISIN ATF0WS (ATF-0WS) Transmission Fluid
    DENSO 3444 Spark Plug
    DORMAN 095156 (095-156.1) Oil Drain Plug Gasket
    FEL-PRO 72565 EGR Gasket
    FEL-PRO 72636 EGR Gasket
    FEL-PRO 61711 Throttle Body Gasket
    FEL-PRO 72694 EGR Gasket
    GATES 34707 Thermostat Housing / Water Outlet
    MAHLE MS19724 Exhaust Manifold Gasket
    MAHLE MS19723 Intake Manifold Gasket
    STANDARD MOTOR PRODUCTS VG250 EGR Gasket
    STANDARD MOTOR PRODUCTS V512 Positive Crankcase Ventilation (PCV) Valve
    STANDARD MOTOR PRODUCTS EGV1235 EGR Valve
    STANDARD MOTOR PRODUCTS TX221 Temperature Sender / Sensor
     
    #4 working1, Sep 1, 2021
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  5. Umerpk

    Umerpk Junior Member

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    I hope swap doesn't include ECU otherwise you'll have to bear speed limiters (Max Speed and Cruise speed limits)

    Posted via the PriusChat mobile app.
     
    #5 Umerpk, Sep 28, 2021
  6. Tombukt2

    Tombukt2 Senior Member

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    I left the JDM water pump Tb and AC comp. All newer than mine all looked better than mine. Saved everything.. of course new spark lugs but what came out looked damn good.
     
    #6 Tombukt2, Mar 15, 2022
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