Water Pump Impeller – Fits Evinrude Johnson OMC 40–60 HP (Replaces 389589, 777129, 777827)

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Water Pump Impeller – Fits Evinrude Johnson OMC 40–60 HP (Replaces 389589, 777129, 777827) is backordered and will ship as soon as it is back in stock.

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Product Details

This high-quality Water Pump Impeller – Fits Evinrude Johnson OMC 40–60 HP is designed as a direct replacement part for 2-stroke outboard motors from 40 to 60 HP, specifically covering models from 1978 through 1986. It ensures reliable cooling performance for your engine.

It serves as a direct interchange for Johnson/Evinrude part numbers 389589, 777129, and 777827, as well as aftermarket references from Sierra, Mallory, GLM, and others.

Engineered for use with the small housing water pump assembly.
Installation is a direct replacement for the original part.
Constructed from durable neoprene rubber for a long service life.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Brand	Part Number
Johnson/Evinrude	389589
Johnson/Evinrude	777129
Johnson/Evinrude	777827
Sierra	18-3055
Mallory	9-45202
GLM	89690
SEI	96-365-03CE
CEF	500345

Engine & Model Compatibility

Confirm your engine model/year in the table below.

Fits a range of Johnson and Evinrude 2-stroke outboards from 1978 to 1986 within the 40–60 horsepower class.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.
Johnson/Evinrude	Various	40	2-Stroke	1978–1986	389589/777129
Johnson/Evinrude	Various	45	2-Stroke	1978–1986	389589/777129
Johnson/Evinrude	Various	50	2-Stroke	1978–1986	389589/777129
Johnson/Evinrude	Various	55	2-Stroke	1978–1986	389589/777129
Johnson/Evinrude	Various	60	2-Stroke	1978–1986	389589/777129
Johnson Evinrude OMC	40 hp	40	2-Stroke	1984–1985	0777129/0389589/0777827
Johnson Evinrude OMC	45 hp Commercial	45	2-Stroke	1985	0777129/0389589/0777827
Johnson Evinrude OMC	50 hp	50	2-Stroke	1979–1985	0777129/0389589/0777827
Johnson Evinrude OMC	55 hp	55	2-Stroke	1979–1985	0777129/0389589/0777827
Johnson Evinrude OMC	55 hp Commercial	55	2-Stroke	1985	0777129/0389589/0777827
Johnson Evinrude OMC	60 hp	60	2-Stroke	1980–1985	0777129/0389589/0777827

Technical Specs

Product Type: Water Pump Impeller (Small Housing)
Installation: Direct replacement
Housing Material: Neoprene Rubber
Dimensions: Height: 21.84 mm (0.86 in) | Overall Diameter: 69.85 mm (2.75 in) | Shaft Diameter: 16.03 mm (0.63 in)
Weight: 57 g (0.126 lb)
Blades: 6

What’s in the Box

1 x Water Pump Impeller

Installation Notes

Disconnect the battery and shift linkage. Unbolt the lower unit (gearcase) from the outboard's midsection and carefully lower it.
Locate the water pump housing on top of the gearcase. Remove the bolts securing the housing cover.
Slide the old water pump housing and impeller off the driveshaft. Note the orientation of the old impeller blades.
Clean the housing interior and wear plate. Lightly lubricate the new impeller and housing with a marine-safe lubricant.
Install the new impeller into the housing, rotating the driveshaft clockwise to bend the blades in the correct direction.
Reassemble the pump, apply sealant to the housing bolts if required, and reattach the gearcase to the outboard.

Troubleshooting & FAQ

How can I confirm this impeller is correct for my engine?

First, check your engine's model, horsepower, and year against our compatibility table. Second, cross-reference your existing impeller's part number with our Part Number Matrix. If you are still unsure, compare the product images and dimensions to your original part before ordering.

What are the signs of a failing water pump impeller?

Common signs include the engine overheating at idle or low speeds, a weak or non-existent water stream from the "telltale" outlet, and visible cracks, tears, or brittleness on the impeller blades during inspection.

How often should I replace my impeller?

As a general maintenance rule, it's recommended to replace your water pump impeller every 1-2 years or every 100-200 hours of use, whichever comes first. This interval can be shorter if you frequently operate in sandy, silty, or saltwater conditions.

OEM vs. Aftermarket?

This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.

Shipping speed & cost?

We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.

Warranty & returns?

Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.

Safety & Important Info

Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
This is an aftermarket replacement, not an OEM component.
Professional installation is recommended for safety and performance.

About Sea Sierra

Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.

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