Alpha One & Gen 2 Outdrive Parts *Drawings *Videos
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Alpha 1 bearing assembly *Upper gearcase

Aftermarket bearing assembly P/N 21520 for Mercruiser outdrive upper gearcase

  • Replaces OEM Mercruiser Alpha one bearing, for 1964-1997 models
  • Compatible with all gear ratios (except 1.32) and includes spacer
  • Timken inner cone #386A outer cone #382A
  • OEM #31-35988A12

21520 bearing set

P/N 21520


Timkin tapered roller bearing set OEM 31-35988A12 $179.99

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