PCV Valve Replacement Questions

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Rebound, Aug 6, 2016.

  1. Rebound

    Rebound Senior Member

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    I'd like to replace my PCV valve, but I have two questions:
    1) Do you put some kind of thread sealant on the valve?
    2) What's the torque value?
     
  2. Mendel Leisk

    Mendel Leisk Sand Pounder

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    It's referred to as "Ventilation Valve Sub-Assembly" * in this, torque value 15 ft/lb, and there's an adhesive spec: Toyota genuine adhesive 1324, three bond 1324 or equivalent. Also, have you watched @NutzAboutBolts video, pinned in the Maintenance section?

    (* good 'ol Toyota nomenclature, they do call it PCV and Positive Crankcase Ventilation elsewhere, and in the directory tree of this section)
     

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  3. Rebound

    Rebound Senior Member

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    Thank you so much! Yes, I watched their video but they didn't mention these things.

    I'll go dig up some ThreeBond 1324. I tried to figure out the equivalent Loctite, and Internet answers are all over the map.

    Hmm... there doesn't seem to be a Loctite equivalent. 10mL of the stuff costs about $20 on Amazon... more than twice the cost of the valve itself.
     
  4. Mendel Leisk

    Mendel Leisk Sand Pounder

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  5. StarCaller

    StarCaller Senior Member

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    but honestly, I consider that almost too much of a good thing/
    I would use the blue loctite (242) for a job like this//
     
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  6. NutzAboutBolts

    NutzAboutBolts Senior Member

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    We didn't use any loctite because its a part that gets replaced every so often. We only use loctite if its a part that we don't plan on replacing because it keeps it sealed tight for good. We just used anti seize to thread it back in.
     
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  7. Mendel Leisk

    Mendel Leisk Sand Pounder

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    Was thinking the same thing, loctited bolts can be a bear to remove later. Good to hear from the pros!
     
  8. Rebound

    Rebound Senior Member

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    I'm surprised by the 15 foot-pound figure. In the video, the bolt looked pretty hard to remove. Fifteen foot pounds is nothing. The oil drain plug is 27 ft-lb and wimpy plastic (plastic!!) oil filter housing is 18 ft-lb. I guess they assume you're using the Loctite? Or maybe it's because they illustrate putting the torque wrench at the end of another wrench. They aren't too clear about that, but no way is 15 ft-lb right.

    I over-think things. I should just shut up and replace the stupid valve already
     
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  9. NutzAboutBolts

    NutzAboutBolts Senior Member

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    The spark plugs are torqued around 13-15 lbs, I guess its tight enough :D lol
     
  10. The Critic

    The Critic Resident Critic

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    That makes no sense at all. Loctite is used to prevent certain fasteners from loosening due to vibration - it is unrelated to whether or not the fasteners is to be removed on a regular basis. If the OEM calls for a thread locker then it should be used.
     
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  11. BruceInOKC

    BruceInOKC Member

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    What is the typical interval for replacing the PCV valve?
     
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  12. Raytheeagle

    Raytheeagle Senior Member

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    Ah the personal preference question. Expect many different variants.

    I did my 2010 Prius II PCV valve at 120 k and it was still checking.

    Some will say every 60k. Some every 90k. But I will do mine at 200 k when I have the intake manifold apart and it is easier to do;). So I fall in the "when convenient" category.
     
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  13. Mendel Leisk

    Mendel Leisk Sand Pounder

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    I was just checking a Honda pcv valve, incredibly hard to get to. I actually did get to it, was able to pull the hose off, and even get a deep socket on it, but was stymied by intake manifold proximity. Shop Manual step one was "remove intake mainifold", which I was hoping to circumvent. Anyway, regrouped, and tested it:

    With the car idling, pinch the vacuum hose leading to PCV valve. If you can hear it click with each pinch, it's working. It was clicking. Done.
     
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  14. Raytheeagle

    Raytheeagle Senior Member

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    If it were only that easy on the Prius :(.
     
  15. BruceInOKC

    BruceInOKC Member

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    Thanks, Ray.
     
  16. Rebound

    Rebound Senior Member

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    There's always an easier way: Pay somebody else to do it.
     
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  17. Raytheeagle

    Raytheeagle Senior Member

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    I can only imagine what the bill for that would be.:confused: Probably north of $100 given they will go from the hood and not underneath.
     
  18. farmecologist

    farmecologist Senior Member

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    I changed mine trying to help solve an oil consumption problem ( I'm trying everything I can think of ). Car had 82K or so on it.

    By the way, the NutzAboutBoltz PCV valve replacement video on youtube video was very helpful. Watching it will help you come up with a plan of attack on how to tackle the job.

    I did not use Loctite on it...I plan on checking it each time I am under the care to change the oil.
     
  19. Mendel Leisk

    Mendel Leisk Sand Pounder

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    Did it help? Too soon to tell? Just curious.

    I've read up a bit, see a clogged valve can cause oil use, due to increased air pressure in crankcase.
     
  20. farmecologist

    farmecologist Senior Member

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    The things I have done so far are listed here :


    However, it is still too soon to tell if any of that improved the consumption issue. I will update the thread above when I have more news to report.
     
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