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Thread: oil leak

  1. #1
    Join Date
    Mar 2009
    Posts
    2

    Default oil leak

    I replaced the water pump impeller and now there is drive oil leaking out of the exhaust passage behind the prop.The drive did not have any leaks until I serviced it.I have taken it back apart twice and replaced the seal that seals the oil passage between the two case halves but this has not made any difference.I tried to pressure test it but air leaks out of the exhaust passage immediately as soon as I put any pressure in it.What am I overlooking here (what did I screw up)?

  2. #2
    Join Date
    Sep 2006
    Posts
    551

    Default

    It sounds like either the seal for the water pump base or the seal for the driveshaft as those should be the only two seals affected by impeller servicing. You can pressure check the lower by itself and spray soapy water around the water pump base to see if that is where the leak is. If the leak is not there it most probably is the seal in the upper for the driveshaft.

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  3. #3
    Join Date
    Mar 2009
    Posts
    2

    Default

    It was the seal in the upper drive housing that was leaking.I will have to be more careful next time!!!!!!!!!!!!!!

  4. #4
    Join Date
    Aug 2017
    Posts
    1

    Default Same issue

    Quote Originally Posted by sbarnes View Post
    It was the seal in the upper drive housing that was leaking.I will have to be more careful next time!!!!!!!!!!!!!!
    What is the part # for the seal in the upper driver housing? Need to see a diagram to figure it out. Thanks

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Sterndrive Engineering, Inc. (SEI) manufactures a stern drive designed to replace Mercury Marine's MerCruiserŽ Alpha OneŽ, R, MR, Gen II and Bravo OneŽ stern drives. MerCruiserŽ Alpha One, R, MR, Gen II and Bravo OneŽ are trademarks of the Brunswick Corporation. SEI has no affiliation with the Brunswick Corporation. Consequently, any warranties governing products and or sold by Brunswick Corporation will not apply to products manufactured and or sold by SEI, or to products damaged due to the operation of an SEI product.