Tutor Auto Water Pump Kit for Johnson/Evinrude 20-35HP — Neoprene Impeller Full Service Kit

The Tutor Auto 393630 water pump kit is a complete neoprene-impeller replacement set designed to restore cooling flow on compatible Johnson and Evinrude 20–35HP outboards.

This kit gathers the key components needed for a full water-pump service—impeller, housing, gaskets, seals and mounting hardware—engineered to match OEM fit and function for a wide range of Johnson and Evinrude engines. It’s built so owners and marine technicians can replace the worn parts that most commonly fail on small outboards and re-establish proper raw-water circulation.

Which models and years will this kit fit?

The Tutor Auto 393630 kit replaces several OEM numbers and fits many Johnson/Evinrude engines across different years. Always confirm compatibility with your exact lower unit or model year before ordering to ensure correct parts and fitment.

• Replaces Johnson/Evinrude part numbers: 393630, 393509, 391636, 0393630.
• Also cross-references Sierra part 18-3382.
• Common fits include 20/25/30/35HP models from various years (see product compatibility list for specifics).
• Works for many 1980s–2001 model ranges—verify against your engine serial and year.

What components are included in the replacement kit?

This kit is a full water-pump service package, so you receive the parts needed to remove the old impeller and reinstall a complete pump assembly. Components are chosen to deliver a direct-fit replacement without sourcing separate pieces.

• Neoprene impeller (part 395289) for flexible, durable vanes.
• Pump cup, pump housing, wear plate, gasket, O-ring and seal for assembly integrity.
• Mounting bolts and an installation wrench to simplify the service task.
• All parts packaged together as shown in product photos.

How does this kit compare to OEM parts and what quality can I expect?

The kit is manufactured to match OEM dimensions and installation points so it mounts and performs like the factory unit. Materials are selected for marine durability; the impeller uses a neoprene compound chosen for flexibility and wear resistance under typical boating conditions.

• Direct replacement design for straightforward installation and alignment.
• Neoprene impeller for resilience against heat and cavitation within rated service intervals.
• Meets or exceeds OEM fit standards though not sold as an original OMC-branded part.
• Includes hardware to avoid mixing mismatched components during repair.

When should I replace the water pump impeller and how often?

Impellers are wear items that should be inspected regularly and replaced on a preventive schedule. Following a routine replacement interval helps avoid overheating and potential engine damage from inadequate water flow.

• Inspect impeller annually or after about 100 hours of operation.
• Replace if vanes show cracking, chunking, or reduced flex.
• Change kit before long boating seasons or extended trips to remote waters.
• Use this full kit to refresh all sealing surfaces and fasteners at once.

Who is this for: The Tutor Auto 393630 water pump kit is suited for boat owners, DIY mechanics and marine technicians working on Johnson and Evinrude 20–35HP outboards who need a full, direct-fit impeller replacement. It’s ideal if you want a single purchase to refresh the impeller, housing and related seals with parts designed to match OEM specifications and make pump servicing simpler and more reliable.