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Air/Oil Separator, O-Ring and PVC Valve
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Thread: Air/Oil Separator, O-Ring and PVC Valve

  1. #1
    Lifetime Member Lifetime Member DeSoulo's Avatar
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    Air/Oil Separator, O-Ring and PVC Valve

    IMG_9141.jpgIMG_9149.jpgIMG_9150.jpgIMG_9110.jpgIMG_9117.jpg
    So I did my second spark plug change due to mileage at 60K. Found my plugs to be dirtier then I recalled from last time. I then found this great video after doing some research.




    The O-ring was leaking and this is a known problem. The Abarth Folks are aware so we are too. You have to remove one extra bolt securing the hose in the second photo to lift up the AOC. I did not clean out the AOC as in the video, I just replaced the O-ring and PCV. It located on the side and photo 3 shows where its located. I wiped down the area by plugs 4,3 and 2 and will continue to monitor it for oily build up.


    Procedure is slightly different and the PCV is located differently, but the part number will fit the 500L unit. Now you can buy the "new improved" O-ring from Mopar. I read on another thread and decided to get these at the local Ace Hardware; Only .75 cents each, so I got 3 just incase.
    Last edited by Fiat500USA; 08-10-2019 at 12:49 PM. Reason: embedded video for better user experience

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    Lifetime Member Lifetime Member DeSoulo's Avatar
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    PCV / Oil Separator O'Ring, PCV Valve

    Here is a follow-up about the video. I have included the part numbers for the improved/Updated O-Ring (0489 3446AB-Looks to be rounded and not flat) as well as the PCV 489073AA. The new O Ring has a grayish tint and seems to be harder then I posted; Its the top ring pictured, with the old flat one in the center, and the shiny one sourced from ACE on the bottom.

    I confess I should have cleaned out the unit as mentioned in the video. I say this because I was getting unusable MPG numbers on the EVIC on the first test drive. It went from 74 to a low of 13mpg. I guess a lot of oil gunk was being sucked through the engine.

    Anyway I ordered the factory pieces (RockAuto), and was able to remove the crimp clamp on one of the hoses to get the black box off and spray it down. You can reuse it if your careful, but get a regular clamp just in case. Car MPG is back to normal (27.4avg) and runs so much smoother.
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    Mine leaked too & I replaced it once.
    That was before I removed the AOS completely.

    Keep one of thos O rings around; it will happen again.

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    Tedolph (08-27-2019)

  7. #4
    Official Vendor NGEN's Avatar
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    Thanks for watching the video and glad it helped

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    Senior Member map's Avatar
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    NGEN, I saw that video previously. Thanks.

    DeSoulo, thanks for the tutorial, especially about the improved O ring. If your box had that much oil in it, perhaps this should be part of the spark plug change routine?

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    DeSoulo (09-04-2019)

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    If you buy orings from a hardware store or auto supply ,I would suggest buy Viton. Buna is cheaper and works with oils but, Viton can take the heat better. At my job I use many different oring materials. Some of the orings like Kalrez or Chemraz are are in the $1k or more price range. Talk about sticker shock.

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    DeSoulo (08-10-2019)

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    Lifetime Member Lifetime Member DeSoulo's Avatar
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    MAP-DeSoulo, thanks for the tutorial, especially about the improved O ring. If your box had that much oil in it, perhaps this should be part of the spark plug change routine?
    MAP, yes I agree with that observation. The manual says the PCV should be serviced around 160K, but that doesn't seem to be proving out.
    A new AOS cost about $236 at RockAuto; That included the PCV valve but Not the O-Ring. The PCV could be checked to see if it still "rattles" during the spark plug service. Still cheaper to clean it out as in the video; Thanks again NGEN!

    Also don't forget to check your air filter as well. My engine is pretty sensitive to dirty air filters and mileage improved when I recently replaced mine. Overall after all the recent work it just runs smoother.

    sportfan
    If you buy orings from a hardware store or auto supply, I would suggest buy Viton.


    Yes I read and researched the Viton O Rings for durability and heat resistance. Maybe the newly updated O-Ring I switched to from Mopar is of that variety.

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    Lifetime Member Lifetime Member Saponetta's Avatar
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    Hey, if this is against rules delete it. I dont really make any money on these, so hopefully I'm excused from a shameless promotion. I only offer them as a service and convenience to members here. But I always have a high quality fluorocarbon o ring in this size and profile in stock. They are used in a component I commonly rebuild. Check the classifieds or better yet just message me. Rated for very high heat. Quality rings like this are usually only available in big lots. You dont wamt to use the 75 cent individual home plombing ones at ace hardeware and $8 to $10 for the mopar one of dubious quality is ridiculous. $4 shipped for one and $2 for any additional. You'll probably never have to replace though if you never remove aos again.
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