LucaSng 393630 Water Pump Kit for Johnson Evinrude OMC 20-35 HP — Direct-Fit Impeller & Full Service Parts

LucaSng 393630 water pump kit is a complete replacement assembly engineered to restore cooling for Johnson/Evinrude/OMC 20–35 HP outboard engines.

If your small outboard is losing cooling efficiency or showing signs of cavitation, a worn impeller and related pump components are often the cause. This kit includes the parts needed to service water pumps used on a range of Johnson, Evinrude and OMC engines, covering various 20, 25, 30 and 35 horsepower models across multiple production years. It’s designed as a direct-fit replacement for OE part numbers like 393630 and aftermarket equivalents such as Sierra 18-3382, so you can return your lower unit to reliable operation without hunting down individual components.

Which engines and model years will this kit work with?

The LucaSng 393630 kit fits many two- and three-cylinder Johnson and Evinrude outboards. It supports 20 hp and 25 hp models from 1985 onward, 25 hp commercial units from 1998–2001, 30 hp models from 1980 to present (and 2-cylinder 30 hp from 1983 on), plus 35 hp models from 1980–1982 and 2-cylinder 35 hp from 1983 onward.

• 20 hp: 1985 and later
• 25 hp: 1985 and later; commercial 1998–2001
• 30 hp: 1980–present; 2-cylinder 30 hp from 1983+
• 35 hp: 1980–1982; 2-cylinder 35 hp from 1983+

What exactly is included in the replacement kit?

The package contains the complete set of pump components shown in the product images so you can perform a full water-pump service in one visit. Typical contents are the impeller, gaskets, seals, bushings, and hardware required to reassemble the pump housing. This eliminates the need to source multiple individual parts and helps ensure a correct seal and fit.

• Replacement impeller sized for the 393630 application
• Gaskets and O-rings to prevent leaks
• Seals and bushings for shaft support
• Mounting hardware for reassembly

How does this kit compare to the original Johnson/Evinrude parts?

The LucaSng kit is manufactured to match the fit and function of OEM components, intended as a direct swap for OE part number 393630 and cross-reference Sierra 18-3382. It’s made to restore pump performance rather than change pump design, so installation follows the same steps as the factory service. Using a complete kit helps maintain cooling flow and prevents common failure points from worn or missing small parts.

• Direct replacement for OE 393630 and cross-reference parts
• Dimensions and materials chosen for compatibility
• Complete set minimizes installation errors

What should I check before installing this water pump kit?

Inspect the lower unit housing and drive shaft for grooves, corrosion, or damage that could compromise the new seals and impeller. Verify the engine model and year against the fit list to ensure compatibility. Also prepare basic tools and a clean workspace to avoid contamination during reassembly.

• Confirm engine model/year matches kit fitment
• Examine housing and shaft for wear or damage
• Replace any additional worn lower-unit components as needed

Who is this for: This LucaSng 393630 water pump kit is intended for boat owners, marine mechanics, and DIY enthusiasts who need a reliable, complete replacement for cooling pumps on Johnson, Evinrude and OMC 20–35 HP outboards. It’s especially useful for those performing routine lower-unit maintenance, restoring older engines to service, or preparing a vessel for a season of boating.