Oil Catch Can, Eliminate that knock!

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by danlatu, May 22, 2017.

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  1. danlatu

    danlatu Senior Member

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    You can use the vented one there is a block off screw. Look at the very first picture I posted you can see the screw is in place.
     
    #41 danlatu, May 24, 2017
    Last edited: May 24, 2017
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  2. danlatu

    danlatu Senior Member

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    Yes in series, cut the "U" shaped pcv hose in half and use the 3/8 coupling. There are OCC with a dump lever that could be mounted by your oil filter and then you could dump both @ the same time. Like the one the ford f150 uses in the youtube link.
    My OCC is in a 3dprinted slip mount and I can pull straight up and unscrew the OCC for dump without disconnecting any hoses.
    You can use black fuel tubing, The clear braided line is rated the the temp, unaffected by the fuel/oil/water and does not kink. I can Also see whats going on in the clear. You will notice that it will turn reddish brown in time because the OCC will not trap 100% of the fine mist. If you blow through a clear straw you will see condensation built up on the inside, OCC will have same affect but it will catch the majority of the wet. I am sure that there is a better OCC out there, but there are no reviews or a shootout.
     
    #42 danlatu, May 24, 2017
    Last edited: May 24, 2017
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  3. Mendel Leisk

    Mendel Leisk Witness Leader

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    Should clarify: I've heard airline style clamps are not good with plastic spigots, coolant spigots for example. They tend to put point load on the spigot just at the tightening screw, can crack plastic spigots.
     
    #43 Mendel Leisk, May 24, 2017
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  4. danlatu

    danlatu Senior Member

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    There is no plastic spigots on this OCC, It is aluminum, The hoses fit so tight I did not use a any clamps. I only put a clamp on the pcv valve itself.
    IMG_0113.JPG
     
    #44 danlatu, May 24, 2017
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  5. Mendel Leisk

    Mendel Leisk Witness Leader

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    Yeah, understand. Funny: Toyota uses no clamps on a couple of coolant connections. Cribbed from your pic, one here:

    upload_2017-5-24_10-16-15.png
     
    #45 Mendel Leisk, May 24, 2017
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  6. danlatu

    danlatu Senior Member

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    Found this pic on google, my same theory as to why pcv location is too low on the prius. Hitting the brakes, turning, oil runoff from the head/pistons travels along the inner wall into the pcv. That is why more than just oil mist is flying through the valve.

    Screen Shot 2017-05-24 at 1.38.31 PM.png

    Some really cheap catch cans do not have any baffling in them.
    Screen Shot 2017-05-24 at 1.38.43 PM.png
     
    #46 danlatu, May 24, 2017
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  7. Maroon

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    I like the mason jar mounting location the best. I don't want condensate building up in the lines anymore than necessary.
     
    #47 Maroon, May 24, 2017
  8. Mendel Leisk

    Mendel Leisk Witness Leader

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    Just for reference, PCV valve info from Toyota Repair Manual:
     

    Attached Files:

    #48 Mendel Leisk, May 24, 2017
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  9. Rebound

    Rebound Senior Member

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    I ordered one, and maybe we'll install it at our next Bay Area Prius Meetup
     
    #49 Rebound, May 24, 2017
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  10. Mendel Leisk

    Mendel Leisk Witness Leader

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    I wonder: would there be room to put the can quite close, say just remove the orig U-shape hose, plumb in the catch can as close as possible? I have the engine enderpanel off every 6 months for oil change: maybe some spot close but accessible from below:

    IMG_6877.jpg
     
    #50 Mendel Leisk, May 24, 2017
  11. edthefox5

    edthefox5 Senior Member

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    Is the G3 pcv located that low on the car in your diagram? Because on the g2 its located on the top of the valve cover.
     
    #51 edthefox5, May 24, 2017
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  12. Raytheeagle

    Raytheeagle Senior Member

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    Since you'll be removing the intake manifold to make this setup, does that mean the egr cooler is back on?
     
    #52 Raytheeagle, May 24, 2017
  13. Former Member 68813

    Former Member 68813 Senior Member

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    i have/had a few toyotas and all them (except the 3rd gen prius) have the PCV on top of valve cover with an elaborate air/oil separator below.
    i have no idea why the prius PCV is so low, makes it very hard to check/replace. are we positively sure there is no air/oil separator behind the PCV in 3rd gen prius?
    danlatu, you looked inside the block, right? does the pcv hole open directly into the crankcase?
    how about the 4th gen?
     
    #53 Former Member 68813, May 25, 2017
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  14. Rebound

    Rebound Senior Member

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    Yeah, let's try the whole enchilada! Are you up for it?
     
    #54 Rebound, May 25, 2017
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  15. Rebound

    Rebound Senior Member

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    Jacek, what we do know is that oil pools inside the throttle body, and it has to get there somehow.

    I replaced my PCV very recently, and it didn't seem to be oily. I didn't inspect the PCV hoses for oil, but the PCV valve itself was dry. Do you agree that when I remove the PCV hose to install the oil catcher, the hoses should be oily if this is indeed the problem?

    The other test is that I will remove and clean my intake manifold and throttle body, and we can inspect the throttle body after 5 or 10K miles to see if oil has returned. If the oil is gone and stays gone, then I'd assume the catch can works.
     
    #55 Rebound, May 25, 2017
  16. Raytheeagle

    Raytheeagle Senior Member

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    I'm down, but it might be better to do in Fremont as your block will be cool and you might be able to do a little pre-work( remove the windshield wiper cowling, engine coolant, etc).

    If you still want to do Lafayette, you might have to be first up so we can get that work going first as it adds a couple of steps and time to the job.

    But count me in(y).
     
    #56 Raytheeagle, May 25, 2017
  17. Rebound

    Rebound Senior Member

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    Let's make it Fremont once more, and Lafayette next time. I'll order up some pizzas and have cold drinks for everyone.
     
    #57 Rebound, May 25, 2017
  18. danlatu

    danlatu Senior Member

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    There are passages behind the pcv valve cover, this is with the cover off.
    IMG_0069.JPG
     
    #58 danlatu, May 25, 2017
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  19. Maroon

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    Wonder how much is coming from the valve cover vent? Maybe tee the PCV and valve cover vent to the OCC then outlet to the IM.
     
    #59 Maroon, May 25, 2017
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  20. danlatu

    danlatu Senior Member

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    I did not see any oil coming from the top crankcase vent. It was clean @ 297k, the lower pcv hose was 1/2 clogged with sludge, the same sludge @ the bottom of the throttle body.
    If oil/fuel/water was flying through this crankcase vent hose, you would see oil all over the top of the throttle body butterfly valve
    turbocharged engines have oil and carbon contamination that cover intercoolers, turbo's, piping, throttle body, intake plenums, valves etc.
    Screen Shot 2017-05-25 at 6.41.29 PM.png
     
    #60 danlatu, May 25, 2017
    Last edited: May 25, 2017
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