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Thread: Slow oil leak - CAS seal?

  1. #1
    Join Date
    Jan 2009
    Location
    Chamblee
    Posts
    86

    Default Slow oil leak - CAS seal?

    Hey,
    So I've been driving around a couple days now, and I notice that there are like 3 drops of oil on the floor coming from the rear of the engine every time I park for a couple hours. So I have a couple questions:
    1) If it's leaking like 3 drops of oil for a couple hours of sitting, will it be that much greater during driving?
    2) I read up a little bit, and the symptom seems to point to the CAS seal. I know it's a pretty cheap job, and I'm planning on cleaning the engine bay tomorrow - so is there any other places I should look after cleaning the bay/driving around a bit?
    Thanks

  2. #2
    Join Date
    Sep 2008
    Location
    Newnan
    Posts
    11,783

    Default

    After the CAS, check just rearward of where the engine meets the transmission. If your rear main seal is leaking, there's a drain hole on the bottom of the bellhousing that will drip the oil out.


    Quote Originally Posted by miata5620
    Eric's Garage ... You buy all the parts I tell you to and you will have a killer car... If you want other parts used your car will suck and it will cost you more...

  3. #3
    Join Date
    Jul 2008
    Posts
    7,536

    Default

    Keep in mind, a CAS leak will often drip from the bottom of the bellhousing as well and can make you think its a rear main. My money is on the CAS as thats the most common oil leak on a Miata.

  4. #4
    Join Date
    Sep 2008
    Location
    Newnan
    Posts
    11,783

    Default

    Yup, my CAS made a big mess. However, you'll be able to tell the difference. The CAS will leak oil all down the top and side of the bellhousing, the rear main will cause the oil to come out of the drain.


    Quote Originally Posted by miata5620
    Eric's Garage ... You buy all the parts I tell you to and you will have a killer car... If you want other parts used your car will suck and it will cost you more...

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