SeaSierra Outboard Water Pump Kit for Johnson/Evinrude 75–250 HP — Complete Rebuild with Sleeve Extensions

The SeaSierra 5001595 Outboard Water Pump Kit is a complete replacement set designed to restore cooling function on Johnson and Evinrude 75–250 HP outboards by matching OEM form and fit.

This SeaSierra kit brings together the impeller, housing, gaskets, seals, sleeve extensions and mounting hardware you need to rebuild the lower-unit cooling pump. It replaces several OEM part numbers and is engineered to meet factory dimensions so you can repair gearcase cooling without sourcing multiple parts separately. Before ordering, verify your outboard model and shaft length to ensure compatibility.

How does this kit fit my Johnson or Evinrude outboard?

The kit is made for a broad range of models spanning 75 HP through 250 HP and replaces known OEM numbers. It includes the housing, impeller, and other pieces that directly mount to the gearcase, so installation follows the original pump layout.

• Compatible with Johnson/Evinrude 75–250 HP models.
• Replaces OEM 5001595, 0435929, 0777802 and aftermarket equivalents.
• Includes sleeve extensions for 25" and 30" shaft lengths (354580, 338637).
• Designed to match factory dimensions for direct replacement.

What parts are included and why each matters?

This kit contains the impeller, pump housing, gaskets, plate, seals, O-ring, cover, grommet and mounting bolts to complete a water pump rebuild. Each component either seals the pump, transmits water flow or secures the assembly, so replacing worn items helps restore cooling efficiency and prevents leaks.

• Impeller kit (5001593) — moves water through the cooling passages.
• Housing (435485) and plate (338485) — form the pump chamber and flow path.
• Gasket (338484), O-ring (302035), seal (331353) — prevent leaks at mating surfaces.
• Sleeve extensions and bolts — ensure correct shaft length and secure mounting.

How do I choose the correct sleeve extension and model fit?

Measure the outboard’s shaft length and compare your current sleeve or part numbers to those listed in the kit. The included sleeve extensions cover common 25" and 30" lower-unit configurations; pick the sleeve that matches your transom and prop shaft setup to ensure proper impeller engagement.

• Check existing sleeve part numbers or measure shaft length from gearcase to propeller centerline.
• Use 25" or 30" sleeve extension included when applicable (354580, 338637).
• Confirm model and serial if unsure to avoid ordering errors.

What should I expect during installation and maintenance?

Installation follows standard outboard water-pump rebuild steps: drain, disassemble lower unit, replace parts, reassemble and test for leaks and proper water discharge. Routine inspection of the impeller and seals during seasonal service helps prevent overheating and costly engine damage.

• Disassemble gearcase to access pump; follow manufacturer torque specs on reassembly.
• Inspect mating surfaces and replace any corroded fasteners for a reliable seal.
• Test-run engine in a safe test tank or with flushing muffs to confirm steady water flow.

Who is this kit best for? Marine DIYers, professional mechanics and boat owners with Johnson or Evinrude outboards in the 75–250 HP range who need a full OEM-equivalent water pump rebuild kit. It suits anyone replacing a failed impeller, repairing leaks, or performing scheduled lower unit maintenance who wants a single-supply solution that includes housing, seals and correct sleeve lengths. Always verify your engine model and shaft length before purchase to ensure proper fit.