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Thread: 121 lower

  1. #1
    Join Date
    Apr 2009
    Posts
    3

    Default 121 lower

    just bought a New 121 lower from you should get it this Wednesday. I am replacing a 1990 Bravo one, and i will need to plug the oil passage hole in my new lower, can i use JB weld to seal the hole?

  2. #2
    Join Date
    Sep 2006
    Posts
    551

    Default

    Yes, JB weld should work. The preferred method would be to tap it and use a set screw though.

    Tech Support

  3. #3
    Join Date
    Apr 2009
    Posts
    3

    Default 121 lower

    what size of a tap and set screw do I need? I want to have it on hand before my lower unit arrives. I have already spent too much time off the water as it is, excited to go out again.

    Thanks

  4. #4
    Join Date
    Sep 2006
    Posts
    551

    Default

    I am not sure. If you have a tap and die set, you can just measure the hole and use the chart that came with the kit.

    Tech Support

  5. #5
    Join Date
    Sep 2006
    Posts
    551

    Default

    I have some better information for you. If you just use a 1/4-20 or 1/4-28 tap, it should work fine. Then just use a set screw, making sure to be flush or recessed with the top of the case. Also put some silicone on the threads to make sure and seal everything.

    Tech Support

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Sterndrive Engineering, Inc. (SEI) manufactures a stern drive designed to replace Mercury Marine's MerCruiser® Alpha One®, R, MR, Gen II and Bravo One® stern drives. MerCruiser® Alpha One, R, MR, Gen II and Bravo One® 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.