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Keep your engine running cool with the FASWORX Water Pump Repair Kit.

This professional-grade kit is engineered to meet or exceed OEM specifications, providing a complete cooling system overhaul for MerCruiser sterndrives and high-horsepower Mercury outboards.

The FASWORX Advantage

Precision Engineering: Every component is molded to exact tolerances to ensure a leak-free seal and optimal water pressure.
Marine-Grade Materials: We use EPDM rubber for the impeller to prevent heat-set and cracking, and 316 stainless steel for the base plate and housing cup for superior corrosion resistance in saltwater.
All-In-One Solution: Includes the impeller, wear plate, housing, base, gaskets, and O-rings—everything needed for a standard service.

Primary Fitment: 1970–1990 MerCruiser Pre-Alpha, R, MR, and Alpha One (Gen I) Sterndrives.

Year	Make	Model / Engine Size	Important Fitment Notes
1983 – 1990	MerCruiser	Alpha One (Gen I)	WILL NOT fit Gen II drives (1991+)
1970 – 1983	MerCruiser	Pre-Alpha (MC-I, R, MR)	Fits standard #1 lower units
Various	Mercury / Mariner	65 HP – 140 HP (4 & 6 Cyl)	Must use short-vane impeller
Various	Mercury / Mariner	V6 (135 HP – 220 HP)	Must use short-vane impeller

PRO TIP: If your sterndrive has a gear oil reservoir bottle inside the engine compartment, you likely have a Gen II drive and this kit will not fit. This kit is designed for the classic Alpha One Gen 1 units with the 2.356" diameter base.