Blown Head gasket rebuild....@297k

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by danlatu, May 8, 2017.

  1. Former Member 68813

    Former Member 68813 Senior Member

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    This thread is better than most sticky posts here. I'm going to download pictures before links go bad.
     
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  2. Mendel Leisk

    Mendel Leisk Witness Leader

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    Maybe report it, ask that it be "stickied"?
     
  3. ETC(SS)

    ETC(SS) The OTHER One Percenter.....

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    +1
     
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  4. danlatu

    danlatu Senior Member

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    Cylinder number identification usually starts at the timing chain. TDC and the alignment of the timing gears always starts @ cylinder1. My bent rod was in cylinder #1 closest to passenger side.

    The cylinder has a coolant jacket that surrounds it to keep the engine @ about 195 degrees farenhient while taking in 14 parts air and 1 part fuel for combustion. If the combustion runs too lean, water pump fails, cat/exhaust clogged the engine will run hot. The heat causes the metal (aluminum to steel/aluminum) to expand and contract. This friction causes the head gasket to fail. The coolant is roughly 1/2 inch away from the cylinder and is the first to enter the cylinder. The coolant is what bent the piston. If you google hydro locked motor, you will find some interesting failures. Water entering the intake, failed egr cooler, throttle body(some have coolant running through them)gasket, sea foam pored in to fast can cause a hydro lock.
    When the combustion chamber has coolant in it, some of it will burn and turn white while exiting the tailpipe. The other unburned portion of coolant then passes through the rings and mixes with the oil. The egr getting clogged in my opinion is responsible for the head gasket to fail because the computer runs a different programming/tune for timing and air/fuel ratio when the egr is opened. A bad tune will destroy an engine. Opening the egr will do nothing when the egr cooler is clogged. That is why some of us are experiencing rough idle at start. My girlfriends car did this one time but has not done it since. I wonder if it is the oil catch that is keeping the egr system clean. Burning oil is essentially carbon build up.

    Screen Shot 2017-05-17 at 11.02.47 AM.png
     
    #104 danlatu, May 17, 2017
    Last edited: May 17, 2017
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  5. jerrymildred

    jerrymildred Senior Member

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    My guess is that when liquid dribbled into the intake, #1 was simply the cylinder with the open intake valve. Luck of the draw.
     
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  6. Mendel Leisk

    Mendel Leisk Witness Leader

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    Just for giggles, before breakfast this morning I wander out to the garage (in housecoat and slippers...) and took a look at that EGR pipe, maybe the canary in the coal mine? This is at 67K km's, and to be fair I did clean it out once before, around maybe 35K. Well it looked pretty much pristine. A little carbony, but no build-up to speak of, not even worth cleaning. A bit of condensation, fwiw. Guess I better go back out there and put things back together.
     
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  7. danlatu

    danlatu Senior Member

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    Started right up first try, ran so smooth and quiet that I did not know it was on. It is also smoking right now and I do not want piss off my neighbors and have the fire department come out. I have to run this @ 2k rpm's and break the rings in. I will do this during the day tomorrow and let you know. Thanks to Nuts&Bolts youtube video on maintenance mode and coolant bleed. There is one missing 12mm nut in the whole rebuilt for the egr valve. Not too bad.
    I've been reading a lot about different motor break in procedures. Getting plates tomorrow. I am going to idle till warm, run motor @2k rpm for 30 min and then flog it. I'm sure there is coolant still in the cat/exhaust system so I'm going to run this thing around the industrial area.
    IMG_0114.JPG
     
    #107 danlatu, May 17, 2017
    Last edited: May 17, 2017
  8. ChapmanF

    ChapmanF Senior Member

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    Yeah, dropping from 12 to 9 volts drops the V²/R heating nearly in half, so as long as it's enough to open the valve, and it does, you've got a much more comfortable safety margin if you're not using the purpose-built electronics to pulse the injector properly.

    I don't remember how long it took for the exhaust to stop making white clouds after we changed the head gasket in a friend's Civic. I think days, anyway, may have been a week. She'd been driving with the bad HG for a while....

    -Chap
     
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  9. jerrymildred

    jerrymildred Senior Member

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    Sweet!! Looks like a new car. I think this is one of the best threads ever. Well done. I hope it becomes a sticky.
     
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  10. Mendel Leisk

    Mendel Leisk Witness Leader

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    I've "reported" you Jerry, asking if they could sticky it. Good idea. (y)
     
  11. danlatu

    danlatu Senior Member

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    My ocd was kicking in hard and wanted all the veins clear on the egr cooler. I use #20awg solid copper wire and poked through the little radiator core's and was not having to much luck. I knew it was still clogged due to the purple power foam settling at the top. Then I put it on a drill and wallah! It works the carbon loose as it spins like a plumbers snake. Copper is soft so I was not worried about damaging the stainless steel. IMG_0115.JPG IMG_0116.JPG IMG_0117.JPG
     
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  12. Mendel Leisk

    Mendel Leisk Witness Leader

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    Good idea!

    You know: just looking at the EGR pipe on ours yesterday, what impresses me is the precision engineering, (near-impossible without 3D CAD), that the pipe is such a good fit. It bridges between two disparate components, that in turn are bolting to opposite sides of the engine. Very tricky geometry is in getting that pipe just right.
     
    #112 Mendel Leisk, May 18, 2017
    Last edited: May 18, 2017
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  13. Tande

    Tande Active Member

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    Incredible! ......do you make "House/Calls".......:ROFLMAO:
     
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  14. danlatu

    danlatu Senior Member

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    I posted anyone can cook! I meant it. It takes effort, trail and error. In the end you will have the greatest satisfaction knowing you did it yourself and saved a sh!t ton of money. Having a garage would be super nice too.
    Tips
    1. If your knees hurt from leaning over the bumper to work on the car. Just point your toes @ the 10 and 2 "o'clock" position and bend your knees. This will prevent hyper extension and knee soreness when working on cars.
    2. Use large pieces of cardboard to work under the car. Absorbs oil, its soft and it gets you low to the ground. If you drop something, you can find it. Sometimes when you drop things with a creep you have to pull out because the bolt/nut is under you.
    3. Use an electric 3/8 ratchet and 1/2 impact gun. The correct tools make the job go quicker and make it fun, so does drinking beer or two:):)
    4. Do not rush, measure twice cut once kind of thing!

    [​IMG]
     
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  15. Mendel Leisk

    Mendel Leisk Witness Leader

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    I like to use a football as headrest when under the car. I rarely get around to finding it though, lol. Just seems like otherwise your neck tendons start protesting after a while, constantly tensing to look up at stuff.
     
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  16. xliderider

    xliderider Senior Member

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    Perfect, we've actually got a Nerf foam rubber football in the garage. :)
     
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  17. Mendel Leisk

    Mendel Leisk Witness Leader

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    I go whole hog, have an NFL and a CFL kicking around somewhere, if I could find them, lol.
     
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  18. Raytheeagle

    Raytheeagle Senior Member

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    This is now a sticky thread:)!
     
  19. jzchen

    jzchen Newbie!

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    So let me get this straight:. In an Atkinson cycle engine the valves do not close until the piston reaches TDC yet it hydrolocked? (Sorry for my poor understanding and not reading all the posts...)
     
  20. Mendel Leisk

    Mendel Leisk Witness Leader

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    I'm thinking any engine has compression, has to.