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Thread: Lower Unit Break-in Question.

  1. #1

    Question Lower Unit Break-in Question.


    I purchased a SE116 Lower Unit and I am in the process of breaking it in. I put the first 5 hours on it not going above 75% throttle. Now it says for the next 5 hours to run full throttle for short periods.
    My question is: What is considered a short period?- Seconds?- Minutes? or what?. Let me know.

    Thank you,

  2. #2
    Join Date
    Sep 2006


    I would say for a minute or less.

    Tech Support

  3. #3
    Join Date
    Jun 2010


    I understand the need to change oil after 10 hours break-in, as I would expect some metal to have been worn. But what is behind the requirement to limit power and RPMs during the break-in period? What good does this do, and what bad things can happen if this is not followed? BTW, I am not challenging the recommendations; just curious as to what is behind them.

  4. #4
    Join Date
    Nov 2006


    When a gear set is new, the pattern is not spread over the entire tooth. The break in period allows the pattern to spread out. If you go full throttle right away, you can actually break teeth off as the gear will not be able to handle full power with such a small initial pattern.

    Tech Support

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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.