Is Head Gasket failure common in Gen 3?

Discussion in 'Gen 3 Prius Technical Discussion' started by JohnStef, Nov 29, 2018.

  1. Bill Norton

    Bill Norton Senior Member

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    Last time I spoke to this buddy, both those couriers were above 400k and 600k miles.
    So they have been whistling down the road a long, long time. Way more time in a Prius than anyone on PC.
     
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  2. Malosos

    Malosos Member

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    Yup, my 2010 HG went out this past summer with about 190k miles on it so had a new engine installed, and just before that replaced the battery packs, def put some money into her this year better last me another 200k miles.
     
  3. mjoo

    mjoo Senior Member

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    The compression and expansion ratios of the corolla's 2zr-fe engine are both 10:1.

    The advertised expansion ratio is 13:1 and the effective compression ratio is 9.5:1 on the 2zr-fxe of the Prius. Maybe with VVT the effective ratio can increase to 10:1 or a little higher - close to the Corolla? Possibly a little higher than 10:1 since EGR is anti-knock. I seriously doubt it would get close to a 13:1 effective compression ratio - the engine would need much higher octane to prevent knocking. It would still remain an "atkinson" engine since the compression ratio is lower than the expansion ratio.
     
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  4. Mendel Leisk

    Mendel Leisk Sidewalk Supervisor

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    Just check the pipe? Is that so hard, lol.
     
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  5. Raytheeagle

    Raytheeagle Senior Member

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    Why when blissful ignorance is so peaceful:cool:.

    Or maybe the game show Press Your Luck returns and we cheer for “No Whammy”;).

    I’ll keep my every so often routine going and support those in my neck of the woods as time allows(y).
     
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  6. Bill Norton

    Bill Norton Senior Member

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    OK, I will!:)
    And it will have crap in it! :eek: How much is the question, correct.

    This is the easy to get to pipe from the EGR valve to the intake manifold, you are talking about, correct?
    I assume the bigger issue is the EGR cooler, correct?

    And I assume usage, driving trends and style, oil consumption and, some say, flavor of the gas used will all have a lot to do about how clogged the EGR cooler will appear.

    Fair enough. I'll look at the easy pipe. And take good pictures.

    But not anytime soon. It's winter. No heated garage. Worse than Canada weather....:LOL:
    And the car is mostly just sitting there. Me and the GF commute together this time of year in my BEV.
    We leave that smelly gasser in hibernation! (I put an 'anti-sulfation' battery minder on it occasionally.)

    Once again, it seems like it may be hearsay that: A choked down (or totally clogged) EGR system takes aim at the head gasket.
    Where did this theory come from?
    Someone theorized 'A lack of EGR flow, when it's expected, will cause Detonation'.
    Well,, the engine has a system dedicated to avoiding Detonation, correct?

    Good news!: I'm meeting the Bank Courier Bud for Celtic Music at a distillery this weekend!
    We will talk about ultra-high mileage Prii ownership and maintenance!! And have a dram or two!:cool:

    Bad news: We won't be taking the Smelly Gasser, even though it's on the other side of town. My town has a great DCFC network !

    Good news:We'll be using 100% American-Made Energy.
     
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  7. Mendel Leisk

    Mendel Leisk Sidewalk Supervisor

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    If you've got some sort of garage, albeit unheated, if it's practical/secure, I would leave the charger on it constantly. For sure read the manual first, verify that's ok. Most smart chargers (well mine at least) are ok to do that.
     
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  8. jack black

    jack black Member

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    did you clean the EGR cooler before the HG? how about after?
     
  9. Malosos

    Malosos Member

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    Mechanic cleaned it after.
     
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  10. jack black

    jack black Member

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    A few questions for PC members who like to investigate and have time:
    Is HG part # shared between prius and corolla engine of comparable years?
    Is HG part # same for 3rd and 4th gen prius?
    Was the HG part # revised within the 3rd gen?
    THX!
    I would love it to do it myself, but still have a daytime job.
     
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  11. Bill Norton

    Bill Norton Senior Member

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    And by doing this 'EGR Cleaning Routine' for yourself and your buds, hopefully none will ever experience a head gasket failure!
    Is that the theory?

    Hopefully engine coolant changes are also being done as recommended!
    These two preventative maintenance items will assure never having a Gen 3 Head Gasket Failure, correct?

    I'm just kicking it again,, How can any of this be proven, one way or another?
     
  12. jack black

    jack black Member

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    only by experimentation. Don't clean yours, you're a part of the experiment.

    another way to prevent is to avoid overheating the ICE. shot down on the smallest indication of overheating.
     
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  13. Bill Norton

    Bill Norton Senior Member

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    OK, I'm in!
    I just got back from a 1200 mi. high-speed Road Trip ! I'll post some dismal MPG display numbers,, there was a wind advisory.
    Anyway ~ 4k / miles per qt. is my oil consumption, so the engine is not too bad:
    Most of that was on the leg with the crazy headwinds pushing through at ~83 MPH GPS speed. The return leg was had very little oil consumed ! So actual oil consumption may be much less.
    I suspect my EGR cooler is not clogged after that flogging!:rolleyes:
    Oil change due this weekend. ATF change too!

    >> "Small Indication Overheating" ??? What's that look like?:cool:,, umm, how does one know there is overheating with a Prius?
    Sure if a light comes on it's time to stop now,, not sure what that light looks like or what msg would appear.
     
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  14. Mendel Leisk

    Mendel Leisk Sidewalk Supervisor

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    Not sure how you connect the dots on that, but carry on.
     
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  15. Tim Garner

    Tim Garner New Member

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    An Italian tune-up?
     
  16. Mendel Leisk

    Mendel Leisk Sidewalk Supervisor

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    Won't do much for EGR deposits I think. Maybe for valves, combustion chamber, but the EGR is a little back water.

    We loaned swapped cars with our son and daughter-in-law recently, for about a week, while they were having car troubles. Anyway, it was mostly driven by daughter-in-law, who's familial background is Italian, and when we got the car back the mpg was down a bit, but the next tank it did pretty good. (y)
     
    #76 Mendel Leisk, Dec 17, 2018
    Last edited: Dec 18, 2018
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  17. Bill Norton

    Bill Norton Senior Member

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    EGR was at max flow rate, max EGT temps, Fuel Flow way up there, for hours on end.

    The Italian Road Trip !

    Eat a looks somethin like thees !
    1st leg ---- TRIP A --- 264.1 Mi ---- 31.0 MPG ---- AVG 75 MPH
    Later --- TRIP A --- 534.5 Mi ---- 33.1 MPG ---- AVG 71 MPH.
    But Adaptive CC (love that ATP!) was set for 83 mph on GPS, 85 mph indicated. (I can post pics)

    Just my Wild Azz Theory,,, just like the WAT of: Dirty EGR circuit = blown head gasket.

    Who knows for sure???

    My WAT theory is: the head gasket failures are from 'Cold Start Knocking', which is 'hydraulic locking' from condensation puddles in the intake manifold, which is horrible for an engine.
    With a little bit of: lack of engine coolant changes as called out in the Owner's Manual.
     
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