Alpha 1 & Gen. 2 Outdrive Parts *Drawings *Videos

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Alpha 1 top cover assembly *Upper gearcase part

GLM Aftermarket Outdrive Replacement Top Cover Assembly Kit with Bearing / Shims / Bolts

  • Top cover assembly for Alpha One stern drive years 1984 to 1990
  • Includes top cover bearing #21511 / OEM 31-32575T1 (1-25/32" O.D.)
  • Only compatible with MR/Alpha one models 1983 - 1990. Does not work with older models
  • GLM Marine aftermarket part # 28400
  • Replaces Mercruiser Alpha One OEM # 94998A4
  • Comes with shim kit # 23261 and 4 bolts

Tech support exploded view Alpha One drawings
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28400 Cover bearing assembly

28400 Cover bearing assembly

P/N 28400 Upper gearcase cover assembly OEM 94998A4 $108.95