Why it might be important to clean out the oil pan and pickup with a head gasket replacement,

Discussion in 'Gen 3 Prius Main Forum' started by Georgina Rudkus, Mar 12, 2022.

  1. Georgina Rudkus

    Georgina Rudkus Senior Member

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    I a long running thread posted by wr69, he noted how about 8 ounces of oil is never drained though the oil pan drain hole. If there is debris left from the failed gasket like coolant+oil residue and previously used head gasket sealant or residue blocking the intake screen. it will dilute the new oil and be circulated through the new engine.

    You can check out the thread at:
    Another Dealer Service nightmare - stripped oil pan threads | Page 4 | PriusChat

    219401_IMG_5259.jpg
     
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  2. Mendel Leisk

    Mendel Leisk Underfoot

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    Just editorial: 2.5 cm equals an inch.

    Typical DIY oil change will have just the front of vehicle raised, which actually helps some?
     
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  3. Georgina Rudkus

    Georgina Rudkus Senior Member

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    This video shows what comes out of the oil pan with a failed head gasket.

     
  4. slowmachine

    slowmachine Member

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    Oil dilution can be easily remedied by a double drain and fill. Solid materials in the oil pan are another matter. If it’s a real concern, inspection of the drained pan with a bore scope camera would be my first step.

    Not a Prius, or even a Toyota, but I lost an engine due to a shop rag in the oil pan blocking the pickup tube. I drove it for at least 5000 miles before throwing a rod on the freeway in Anaheim, CA. Bits of gasket material or sealant probably aren’t an emergency.
     
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  5. Salamander_King

    Salamander_King Senior Member

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    Not sure of the orientation of the oil pan. But if the picture on the first post is showing the orientation of the pan being the bottom of the picture is the direction of the front of the car, then would it make even better if you can rise the driver side higher than the passenger side to give a tilt so that more can drain from the side?
     
  6. Georgina Rudkus

    Georgina Rudkus Senior Member

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    I have a replacement oil pan. Tilting it toward the driver side will just move the equivalent quantity to the pocket on the end left of the drain plug location. I'd just replace the pan with a gasket, instead of gluing it to the upper oil pan with RTV. That makes for easy future removal and replacement, whenever it would be needed.

    FEL-PRO OS 30829 Oil Pan Gasket Set



    51xxEui7aKL._AC_SL1024_.jpg
     
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  7. Salamander_King

    Salamander_King Senior Member

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    Thanks. Yeah, the drain hole location and angle are definitely not at the lowest point, and the length of the threaded part is making it impossible to drain out the oil completely.

    Just to be sure, is this the orientation of the pan with respect to the car? If so, raising the rear and passenger side higher would be most beneficial to drain more out by gravity. Although, as you pointed out, there seems to be a limit to how much can come out.
     
    #7 Salamander_King, Mar 12, 2022
    Last edited: Mar 12, 2022
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  8. Georgina Rudkus

    Georgina Rudkus Senior Member

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    The front of the car would be to the upper left of the picture.

    Consequently, your 2021 Prime uses the same pan.
     
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  9. Mendel Leisk

    Mendel Leisk Underfoot

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    You need to rotate the arrow 90 deg counterclockwise (viewing from above).

    Maybe they put the drain bolt thus for protection from road rash.
     
    #9 Mendel Leisk, Mar 12, 2022
    Last edited: Mar 12, 2022
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  10. Salamander_King

    Salamander_King Senior Member

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    Thanks. Yeah, I knew it was the same oil pan on my PP. But, I have never done an oil change on my Prius yet. Used free Toyota Care and sold the car when that expired.

    I will never do oil pan replacement DIY, but maybe I may try the oil change. So, the direction is as shown below? To maximize the draining, I should raise the Driver side and Front side higher. I will try to remember that.
     
    #10 Salamander_King, Mar 12, 2022
    Last edited: Mar 12, 2022
  11. Georgina Rudkus

    Georgina Rudkus Senior Member

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    Front of car is to the upper left of the picture. That which is marked "driver's side" is to the front of the car, The arrow points to the passenger side.
     
    #11 Georgina Rudkus, Mar 12, 2022
    Last edited: Mar 12, 2022
  12. Salamander_King

    Salamander_King Senior Member

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    OK. Are you saying that the pan is placed somewhat in diagonal in relation to the car? So, it is more like this? This would make the drain hole to be located the furthest rear.
     
    #12 Salamander_King, Mar 12, 2022
    Last edited: Mar 12, 2022
  13. Mendel Leisk

    Mendel Leisk Underfoot

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    I edited my prev post. Bottom line: drain bolt is at the rear.
     
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  14. Georgina Rudkus

    Georgina Rudkus Senior Member

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    Rotate the arrow another 45 degrees to the left.
     
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  15. Salamander_King

    Salamander_King Senior Member

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    OK, I hope I finally got it this time. IS THIS THE WAY the oil pan is oriented in relationship to the car?

    upload_2022-3-12_11-58-0.png
     
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  16. Georgina Rudkus

    Georgina Rudkus Senior Member

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  17. Salamander_King

    Salamander_King Senior Member

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    Phew!

    I deleted the images with the wrong orientation arrow so that other readers will not get confused... like I was. LOL
     
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  18. Mendel Leisk

    Mendel Leisk Underfoot

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    Again, considering the drain bolt orientation: if you've got the front raised, think it'll help with the drain.

    FWIW, I really raise the front high, sometimes start it draining and just go in for a while, and when I put in the spec'd (4.2 liter), level ends up about 4~5 mm below the top mark on dipstick.
     
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  19. Mendel Leisk

    Mendel Leisk Underfoot

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    Baster with a flexible u-shaped tip?

    9E5B9575-5065-4F98-820D-8B5DDBDE8BEF.jpeg
     
    #19 Mendel Leisk, Mar 12, 2022
    Last edited: Mar 12, 2022
  20. slowmachine

    slowmachine Member

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    I use the one-liter version of those to add oil to my Honda generator and snowblower engines. Zero mess or waste compared to pouring through a funnel.
     
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