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

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Mercruiser Alpha 1 water pump assembly lock nut

Stern drive assembly lock nut for upper-lower gear-case

  • 5 pack Mercruiser Alpha 1 lock nuts
  • GLM part #21170 OEM number #11-13439-1
  • Can be used on the bell housing or lower unit
  • Click here for Alpha one exploded drawing

Exploded view Mercruiser drawings
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21170

21170 lock nuts

P/N 21170 nut (5 units) $9.29