EGR Cooler screws

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Ben Schneider, May 31, 2019.

  1. Ben Schneider

    Ben Schneider Junior Member

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    in spite of being careful, managed to drop 2 screws in the engine where they were impossible to find (i tried with flashlight, magnet, of course looking under car, and drove car back and forth with jolts to try to dislodge them)

    if someone might know the presumably metric sizes of these two screws (circled in green), would appreciate (the bolt on the top of the cooler and the stud at the very rear (closest to driver)) egr_cooler_diagram_156379_upload_2018-11-9_6-55-59_f1.png
     
  2. The Critic

    The Critic Resident Critic

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    They are the exact same studs as the ones used for the exhaust manifold. Not sure on the dimensions, but I would guess M8x1.00 or M8x1.25.

    Stud = 90126-08052
    Nut = 90179-08101 (not 100% sure, multiple options are listed)
     
  3. Borninblue

    Borninblue Active Member

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    I did the same thing, go to dealer parts they can order for you and they are dirt cheap. I got all new hardware for cooler, they were rusted anyways.
     
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  4. Mendel Leisk

    Mendel Leisk Sunday driver DIY’r

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  5. The Critic

    The Critic Resident Critic

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    They are most likely stuck between the subframe and the steering rack. Don’t ask me how I know...
     
  6. Ben Schneider

    Ben Schneider Junior Member

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    =============

    i looked for hours... was able to seemingly get the cooler connected well enough for the short run. been driving it for a week or two

    i had called dealers and they had nothing in stock. got the usual, just give us your info over the phone etc... was expecting it to be expensive like everything else at the dealership... home depot has metric bolts for around a dollar each.
     
  7. Mendel Leisk

    Mendel Leisk Sunday driver DIY’r

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    If you go that way, bring the cooler along. It seems to me you could connect the cooler to exhaust with a metric bolt, instead of the stock stud plus nut. You could get it slightly long, then put a washer or several behind the head of the nut to finetune the projection.

    And for the short bolt holding the cooler to the cylinder head, just a metric bolt, again maybe slightly long and count on a washer or several behind the head. Or just omit that bolt, and the nut going on the stud at the underside of cooler, the hard one to reach. The thing is plenty secure anyway.

    Still, if I was in your shoes, I would restore it to stock. I am a bit obsessive. The parts numbers (gleaned from my previous link):

    1. Top bolt: 91671-80820
    Pump Assembly Screw - Toyota (91671-80820) | Toyota Parts

    2. Back of cooler stud: 90126-08052
    Toyota Online Parts | Genuine Toyota parts | Toyota Parts Online product search | Toyota Parts

    3. Back of cooler nut: 90179-08101
    Manifold Nut - Toyota (90179-08101) | Toyota Parts

    They're all about $1 apiece. You could order through any dealership, would take a few days. If you can't have the downtime, use the Home depot bolt in the interim, for the back connection.

    Number 2 and 3 corroborate @The Critic's info, btw. (y)
     
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  8. Georgina Rudkus

    Georgina Rudkus Senior Member

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    The screws are 8x1.25 with 12mm hex washer flanges. The stud is als8 8x1.25.
     
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  9. Merkey

    Merkey Active Member

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    How do you know?
     
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  10. Raytheeagle

    Raytheeagle Senior Member

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    Experience is sometimes the best teacher;).

    Having done this job 8 times, I’ve grown my experience tool box some(y).
     
  11. Merkey

    Merkey Active Member

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    I cleaned the EGR tube last week at 91000 miles. Some deposits, but not too bad. I used a nylon brush I bought at Walmart, but no soaking in Oxiclean or use of a solvent. Pretty simple, but don't know if I want to attempt the EGR cooler.
     
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  12. Raytheeagle

    Raytheeagle Senior Member

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    It’s not that bad;).

    Get the pressure washer out and it’ll make short work of the deposits:).

    Good luck (y).
     
  13. Borninblue

    Borninblue Active Member

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    Nobody “wants” to do the cooler. It’s necessary if you want the vehicle to last.
     
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  14. 4est

    4est Active Member

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    Egr cleaning fluid and then pressure washer = like new
     
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  15. The Critic

    The Critic Resident Critic

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    What is EGR cleaning fluid?
     
  16. iskoos

    iskoos Active Member

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    Air compressor or pressure washer will do the job.
    I used a few cans of spray break cleaner because I had an air compressor, I felt that I needed to have some liquid cleaner to go with it.
    If you have a pressure washer, I imagine, you could get it done with it alone.
     
  17. paphillyman

    paphillyman Member

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    A pressure washer works great on the cooler and valve , what I use on the EGR pipe is acetone , got it spic and span ! I just zipped tied the cooler and the other parts to a chain linked fence and blasted away
     
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  18. 4est

    4est Active Member

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    Exactly that.
    It comes in a spray can
     
  19. Mendel Leisk

    Mendel Leisk Sunday driver DIY’r

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    Maybe this:

    Diesel EGR Extreme Cleaner | Wynn's Europe

    And here's a comparison test:

    Diesel EGR Extreme Cleaner | Wynn's Europe

    Still, pressure washers aside, I swear by oxi-clean. From what I've read here it's less effective as clogging gets more extreme, but still, worked fine for my low mileage case, and very thorough, shiney-new clean.

    I like too, that it's relatively benign, can be used indoors, water soluble. It takes time to work, but that's ok.
     
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  20. frodoz737

    frodoz737 Top Wrench

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    While the other components are easy to clean...I will just buy a new cooler when the time comes. TDIs taught me that lesson.
     
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