What's on the back of engine, above oil pan? (Wet!)

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by MrPete, Jul 19, 2025 at 1:07 PM.

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  1. NutzAboutBolts

    NutzAboutBolts Senior Member

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    @MrPete

    Is your engine from a 4th gen engine? I see the black bolt in the back by the oil pressure sensor.
     

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    #21 NutzAboutBolts, Jul 22, 2025 at 1:26 AM
  2. MrPete

    MrPete Active Member

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    Good questions...

    I use Techstream for intense stuff, and keep an OBDlink LX installed while on the road, etc.

    OBDlink does seem somewhat smart, yet I don't get the impression it's doing anything all THAT fancy. IIRC its mostly a question of which lines it knows how to communicate with.
     
    #22 MrPete, Jul 22, 2025 at 12:36 PM
  3. MrPete

    MrPete Active Member

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    It's a 2015 (final Gen 3 year) from Hybrid Pitstop. The first year they fully solved the piston/ring issues.

    But according to the diagrams even for 2011, there are some extra bolts on the back side.
     
    #23 MrPete, Jul 22, 2025 at 12:37 PM
  4. Iron Man Prius

    Iron Man Prius New Member

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    Final year for a Gen 3 block was 2017 for Prius V and CT200h..and the piston rings were technically changed February 2014, for the 14.5 cars. ;)
     
    #24 Iron Man Prius, Jul 22, 2025 at 12:59 PM
  5. MrPete

    MrPete Active Member

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    Right. But to install a 2016 engine in a Gen3 (normal) Prius is more than a little tricky.Two years in, I am appreciating the expertise and care of Hybrid Pitstop in their engine replacement/upgrade program. :)
     
    #25 MrPete, Jul 22, 2025 at 1:03 PM
  6. Mendel Leisk

    Mendel Leisk MMX GEN III

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    They solved it by finally acknowledging the low-friction piston rings they purposely spec'd, were an abysmal failure.

    Oh, and issued a TSB that says they'll replace pistons/rings on pre-revision Prius, IF it's burning more than a quart every 1100~1300 miles, AND has under 60k miles on the odometer.

    What a nice lot, always in our corner. :rolleyes:
     
    #26 Mendel Leisk, Jul 22, 2025 at 2:21 PM
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