UANOFCN Water Pump Repair Kit with Housing for Johnson Evinrude V4/V6/V8, 85–300 HP — Complete Internals and Stainless Fasteners

This UANOFCN water pump repair kit replaces Johnson/Evinrude part 5001594 and compatible numbers, giving you the parts needed to rebuild the lower-unit cooling pump and restore reliable water circulation. The kit includes the housing and a full set of internals—impeller, seals, gaskets, fasteners and wear components—so you can complete the job without sourcing separate pieces. It fits a wide range of Johnson and Evinrude four-, six- and eight-cylinder outboards, covering common horsepower bands from 85 up to 300 HP.

How does this kit restore my outboard's cooling system?

By replacing the worn impeller, seals, and housing the kit re-establishes a tight pumping chamber and proper impeller compression against the wear plate. That improves water lift and reduces cavitation risks when installed correctly. Use the included gasket and O-rings to seal mating surfaces and prevent leaks that can compromise pump performance.

• Includes impeller, wear plate, and full set of gaskets and O-rings.
• New housing restores correct pump geometry and clearances.
• Stainless fasteners and impeller key for secure assembly.

Which engine models and part numbers does it replace?

The kit is designed to fit Johnson and Evinrude V4, V6 and V8 outboards across many common horsepower configurations. It replaces OEM and aftermarket references so you can match by part number or engine application. Use the part references to confirm fitment before ordering for a precise match.

• Replaces Johnson/Evinrude 5001594 and related numbers (390768, 391637, 392750, etc.).
• Compatible with 85HP–300HP V4/V6/V8 models.
• Also replaces Sierra 18-3392 and REC5001594 equivalents.

What comes in the box and what tools or checks are recommended?

The package includes every consumable and hardware item for a full rebuild of the water pump assembly, so you won’t need extra parts in most cases. Basic marine tools and a torque wrench are helpful for correct assembly; inspect the driveshaft and lower-unit water passages during service. After installation, verify the impeller orientation, lower unit submersion and that the muff/cooling passages are secured to ensure water draw.

• Kit contents: impeller, housing, gasket, wear plate, seals, O-rings, grommets, damper, bolts, screws, impeller key, pump cup.
• Recommended: socket set, torque wrench, sealant, and water test on the transom.
• Quick checks: impeller direction, secure muff, and leak-free gasket surfaces.

How do I troubleshoot if the pump still won’t draw water after installation?

If flow is weak after rebuilding, re-check assembly orientation and look for external leaks or clogged cooling passages. Confirm the impeller blades are flexing and the housing and wear plate are clean and undamaged. A misaligned muff or insufficient lower-unit submersion during testing can mimic pump failure, so follow a methodical inspection routine.

• Verify impeller installed with proper blade curve and key engaged.
• Inspect muff and lower-unit for leaks or blocked outlets.
• Ensure gasket seals are seated and fasteners torqued correctly.

Who is this for: This kit is aimed at boat owners, marine technicians, and DIY mechanics who need a complete, time-saving rebuild solution for Johnson and Evinrude lower-unit water pumps. It’s suitable for routine maintenance or emergency repairs on 85–300 HP V4, V6 and V8 outboards when the impeller, seals, or housing show wear. If you want a single purchase that includes housing and all internal components, this kit provides the parts and references to match common OEM replacements.