Tutor Auto Water Pump Kit for Johnson Evinrude 20–35 HP — Direct-Fit Neoprene Impeller & Complete Hardware

Complete water pump impeller kit that replaces Johnson/Evinrude part numbers (including 393630) for 20–35 HP outboards to restore engine cooling and water circulation.

Keeping an outboard's cooling system functioning is essential for reliable performance on the water. This Tutor Auto 393630 water pump kit supplies the neoprene impeller and all mating components needed to service Johnson and Evinrude 20–35 HP models from the 1980s through early 2000s. The kit is a direct-fit aftermarket replacement designed to match factory dimensions so you can swap parts quickly without modification.

Which engines and years will this kit work with?

The kit is formulated to replace multiple OEM part numbers across Johnson and Evinrude models. It's intended for 20 HP and 25 HP engines 1985 and later, many 25 HP commercial models from 1998–2001, 30 HP units from several early-1980s model years, and select 35 HP versions. Always cross-check your engine's part number against the compatibility list before purchasing.

• Replaces Johnson/Evinrude part numbers: 393630, 393509, 391636, 0393630
• Sierra cross-reference: 18-3382
• Coverage: Johnson/Evinrude 20–35 HP across specified years and configurations
• Verify model/year and serial number for exact fit

What components are included and how do they improve reliability?

This Tutor Auto kit contains the neoprene impeller plus the pump cup, housing, wear plate, gaskets, seals, mounting bolts, an installation wrench and O-ring — everything needed for a full water pump service. Using matching components reduces the risk of leaks and misalignment that can shorten impeller life or cause poor cooling flow.

• Neoprene impeller for flexible vane action and heat resistance
• Pump cup, housing and wear plate to restore correct clearances
• Installation bolts, gasket, O-ring and seal for leak-free assembly
• Provided wrench simplifies on-boat replacement

How easy is installation and does this match OEM fitment?

The kit is manufactured to OEM dimensions for a direct replacement experience — no custom machining or special adapters are required. If you are comfortable with basic outboard maintenance, the swap can typically be done with hand tools in a few hours; the included hardware and wrench speed the process and help ensure proper torque and alignment.

• Direct-fit design mirrors factory parts for easy swap-in
• Includes all necessary hardware and a wrench for installation
• Recommended to inspect gearbox and water passages when servicing
• Replace annually or every ~100 hours to prevent cooling failures

What materials and quality standards are used?

The impeller is molded from a durable neoprene rubber compound chosen for flexibility and resistance to heat and cavitation. Housings and wear components are made from durable metals or composites to maintain proper clearances and extend service intervals. Although this is an aftermarket kit and not an OMC-branded product, it is built to meet or exceed factory fit and function standards.

• Neoprene impeller for longevity and vane resilience
• Precision housings and wear plate to preserve flow geometry
• Seals and gaskets engineered to prevent leaks and intrusion
• Quality control ensures dimensional accuracy and reliable performance

Who this kit is for: Boaters, marine mechanics and DIYers who own Johnson or Evinrude 20–35 HP outboards and need a full water pump service kit to restore cooling performance. It's suitable for routine maintenance or preventative replacement before a season, and for anyone who prefers a single-purchase solution that includes impeller, housing parts and installation hardware. Always confirm compatibility with your engine serial/model before ordering.