LucaSng Water Pump Kit 393630 for Johnson / Evinrude 20–35 HP — Impeller & Gaskets

LucaSng 393630 water pump kit is a complete replacement assembly designed to restore cooling performance on 20–35 HP Johnson, Evinrude and OMC outboards. This premium aftermarket pump kit includes the impeller, housing components, gaskets and hardware shown in the parts image, engineered to fit the same models and years as the original 393630/0393630 unit. It’s built for routine service and field repairs to help maintain proper engine cooling on small outboard motors. The kit replaces OEM part numbers and compatible Sierra items, offering a full parts set that simplifies swap-outs during seasonal maintenance.

Which engines and model years will this kit fit?

The LucaSng 393630 kit is sized for a range of Johnson, Evinrude and OMC outboards spanning late 1970s designs through the early 2000s, depending on horsepower and cylinder configuration. Check the specific year and HP of your motor against the compatibility list before purchase to ensure correct fitment.

• Fits 20 HP models from 1985 and later
• Fits 25 HP models from 1985 and later and commercial 25 HP from 1998–2001
• Fits 30 HP models from 1980 to present; 30 HP (2-cylinder) from 1983 and later
• Fits 35 HP models from 1980–1982 and 35 HP (2-cylinder) from 1983 and later

What parts are included and what condition are they in?

The kit arrives with all components needed to replace a single water pump assembly, packaged to mimic the original equipment layout so you won’t need additional parts for a standard rebuild. Components are manufactured to aftermarket tolerances and intended for marine service use; they should be installed following the engine maker’s torque and sealant specifications.

• Impeller, rubber housing, gaskets and O-rings included
• Metal housing components and fasteners supplied as pictured
• Compatible replacement for Johnson/Evinrude 393630/0393630 and Sierra 18-3382
• Supplied ready for routine installation by a DIYer or mechanic

How does replacing the pump affect engine operation?

A properly functioning water pump maintains coolant flow through the engine’s passages to prevent overheating and to preserve internal components. Swapping a worn impeller and seals for fresh parts helps restore correct flow rate and reduces cavitation or loss of pressure that can damage the lower unit over time.

• Restores sea-water circulation through the motor’s cooling passages
• Reduces risk of overheating and potential power loss
• Prevents premature wear of the lower unit from inadequate cooling
• Improves reliability during extended cruising and idle periods

Can I install this kit myself, and what tools are needed?

Many owners with basic mechanical skills can replace the pump using standard hand tools and following the service manual. However, if you’re unfamiliar with lower unit removal, gasket orientation, or torque specs, professional installation is recommended to avoid leaks or misalignment.

• Basic socket set, screwdrivers and pliers typically required
• Sealant, torque wrench, and pump alignment tools recommended
• Service manual guidance or exploded diagram helpful for reassembly
• Professional marine technician recommended for complex cases

This LucaSng replacement water pump kit is intended for boat owners, repair shops and marinas who need a direct-fit aftermarket solution for common Johnson and Evinrude small outboards. It’s best for seasonal maintenance, preventative service, and restoring cooling performance on 20–35 HP motors where the original 393630 or compatible Sierra parts are required. If you want a full parts set to complete a lower-unit pump rebuild without sourcing individual pieces, this kit provides the necessary components in one package.

FAQ

Q: Does this kit replace OEM part 393630?

A: Yes. This LucaSng kit is a compatible replacement for OEM 393630/0393630 and Sierra 18-3382.

Q: Is the impeller material suitable for saltwater use?

A: The impeller is made for marine environments; rinse and inspect regularly after saltwater use.