Alpha One & Gen 2 Outdrive Parts *Drawings *Videos

Mercruiser Alpha 1 water pump assembly lock nut

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

21170 lock nuts P/N 21170 nut (5 units) $15.99

Customers who ordered 21170 lock nuts also purchased:
GLM 12120 Water pump	P/N 12120 Outdrive lower gear case water pump impeller kit. For Alpha One 1984-1990 models. Replaces Sierra 18-3320. $42.99
90095 Bearing carrier puller in the lower unit	P/N 90095 Prop and bearing carrier puller $104.99
90110 Tool	Shift cable tool GLM aftermarket P/N 90110 or OEM 91-12037 Used to remove and install shift cable on outdrive gimbal housings

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