Don't Buy a 3rd Gen Prius! - Blown headgasket at 233k

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Absalom, Feb 13, 2019.

  1. Absalom

    Absalom Junior Member

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    I don't consider your reply to be sidetracking at all. I want answers on why a HG would fail on a seemingly healthy car that wasn't overheating or consuming coolant.
     
  2. Mendel Leisk

    Mendel Leisk Sand Pounder

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    How are you monitoring temperature? Just an aside: it'd be REALLY nice if Toyota could include a coolant temp gauge on these cars.
     
  3. frodoz737

    frodoz737 Top Wrench

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    The OP bought a very used and already broke 2010 Prius with 233K miles on it. :whistle:
     
  4. Absalom

    Absalom Junior Member

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    Why didn't you tell me in advance?? :whistle:
     
  5. Borninblue

    Borninblue Active Member

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    Did you clean intake manifold too?
     
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  6. Mendel Leisk

    Mendel Leisk Sand Pounder

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    The "Torque To Yield" bolts you're referring are the cylinder head bolts? Attached is a TSB for piston/ring replacement, and they put those bolts in an "as needed" category; not sure what that means. There's a revised part number for them too. IIRC you're looking at around $100 to replace them. Maybe cheap insurance??
     

    Attached Files:

  7. Mendel Leisk

    Mendel Leisk Sand Pounder

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    Torque-to-yield fastener - Wikipedia

    Wiki suggests to replace though (see "disadvantages" in the above. What would define the bolts as being TTY? Just that it's common for cylinder head bolts? The distinctive torquing method?
     
  8. The Electric Me

    The Electric Me Go Speed Go!

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    Well...

    You bought a high mileage, used Prius. In those cases, you don't know how it was driven or maintained.
    Hardly fair IMO to disparage the build quality of Prius and Toyota, when you are dealing with a vehicle you bought used and have less than month experience with.
     
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  9. egn83b

    egn83b Junior Member

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    If the hg is an issue on these motors it might be well worth a new set of tty bolts and seal up the engine with silicon glass sealer at 230k miles. Nissan altima's back in the mid 2000's grenaded 4 cylinder engine like crazy because the aluminum was too soft and not repairable. The biggest cooperates in most hg failures is when the thermostats stick closed for too long. There is a video on youtube of a prius with a bad coolant pump which still ran but didnt turn so it might be good to throw those away at 200k too.

    Posted via the PriusChat mobile app.
     
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  10. Mendel Leisk

    Mendel Leisk Sand Pounder

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  11. cnc97

    cnc97 Senior Member

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  12. padroo

    padroo Senior Member

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    It seems that aluminum engines with aluminum heads are more prone to head gasket problems than the old cast iron versions. They certainly don't handle overheating as well. All in the name of saving weight.
     
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  13. Absalom

    Absalom Junior Member

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    From those that have actually done it, when using an OEM HG, do I need to use a gasket sealant at all?
     
  14. Mendel Leisk

    Mendel Leisk Sand Pounder

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    Repair Manual says just a couple of dabs of "seal packing", at leak-prone points I assume:

    upload_2019-2-18_10-0-54.png
     

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  15. The Critic

    The Critic Resident Critic

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    Just buy a $15 subscription to alldatadiy. It will have all of the info you need for 12 months. Use coupon code AZREWARDS.
     
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  16. padroo

    padroo Senior Member

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  17. ekpolk

    ekpolk What could possibly...

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    At the end of the "day," -- in the very long run -- the whole car is, in essence, consumable. Yes yes, I know the practical meaning of the term. My point is that, as some others have suggested, at this mileage, almost anything can happen.

    I just went through this with my Gen-2, worth about $2k by the book, but needing over $7k in work (severe brake system damage). Sure, a head gasket is a major job. But it's also a relatively simple one at least in concept (I wouldn't want to try one myself...). You just have to make the decision -- fix or scrap. . . I hope you find a good solution and wish you well. :cool:
     
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  18. padroo

    padroo Senior Member

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    Old cars and non DIY people don't mix well together.
     
  19. Absalom

    Absalom Junior Member

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    The head is off, gasket was blown right at the #2 cylinder. Going back together tomorrow. Cake job so far. If I were a "DIY people", it'd be even easier.
     
  20. ekpolk

    ekpolk What could possibly...

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    Pictures!
     
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