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Thread: Two-Piece Shaft Merc 3.0 SEI 216

  1. #1
    Join Date
    Aug 2011

    Default Two-Piece Shaft Merc 3.0 SEI 216

    I ordered and received a SEI 216 for a Mercury 3.0 V6 with a 25" shaft. The se# is OG558455. Upon taking the old unit off to install the new one I discovered that this is a two-pice shaft. The lower droped right off along with the coupler but I cannot figure out how to get the upper shaft out so that I can put the new lower on. Is there some trick or special tool required? The shaft is in the exhaust housing and there is really no way to put your hands around it to pull on it.

  2. #2
    Join Date
    Aug 2011

    Default 13- splin

    I should mention that I counted the splines and this is a 13 spline model

  3. #3
    Join Date
    Nov 2006


    Were you able to get the shaft out after calling us?

    Tech Support

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Oldsmar, FL 34677

tel: 813.925.7127
fax: 813.925.7064

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.