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Thread: Rear Main Seal leak /drip

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    Jr Member G ~ MINI's Avatar
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    Default Rear Main Seal leak /drip

    Hey Guys
    I have been battling to figure this out for a while now.


    Replaced twice - the seal has dripped several times and then gone ...no dripping
    Lose about 1/4 litre over a whole day of track lapping

    Happens only under extreme engine loads / Track lapping events / Revving past 8K

    Several Question- love your feedback and any experience knowledge shared:

    How much PSI can the OEM main rear seal can handle before starting to let oil by?
    Is this part upgradable to a higher performing better seal product ?
    Can this be due to overfilling oil and creating extra pressure?
    Will venting PCV to a catch can elevate the internal pressure?

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    Jr Member G ~ MINI's Avatar
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    Default Re: Rear Main Seal leak /drip

    Ha !
    Did some online research and some calls and here's what i found so far;

    On modified MZR 2.0L (also in the NC MX5 platform)
    Hmmm now i wonder if the Global Cup MX5 series had same issues in the NC.

    The OEM rear main seal will drip /leak when under race /track heavy load and High constant RPM
    Why .... (info from call with Esslinger Racing )
    Main reason - High oil pressure cause by either or combo of the following:
    PCV not vented to a breeder or a oil catch can.
    Over fill engine oil and/or extra oil used with a oil cooler (when overfilled plus high revving
    can cause oil to froth and increase oil pressure)
    High revving blowby by engine if Torque plate not used in re-assembly

    Not talked about - if thicker can contribute or aide in blowby by provided better ring seal

    Solutions:
    Venting PCV
    Replace OEM with the Viton seal and new aluminum housing made by Esslinger (on back order)
    Dont overfill

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