Water Pump Impeller Kit – Fits Johnson/Evinrude 40-55 HP (Replaces 396809, 777214)

$14.49

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Water Pump Impeller Kit – Fits Johnson/Evinrude 40-55 HP (Replaces 396809, 777214) is backordered and will ship as soon as it is back in stock.

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If you have any questions, feel free to email us at info@sierramarines.com, and we’ll get back to you within 20–36 hours.

Product Details

This Water Pump Impeller Kit – Fits Johnson/Evinrude 40-55 HP Outboard Motors (Replaces 396809, 777214) is designed for 2-stroke outboard motors, primarily from 1986–1989. It restores cooling system performance, preventing engine overheating and ensuring reliable operation for a range of 40, 45, 48, and 55 HP models.

It directly replaces Johnson/Evinrude part numbers 396809, 777214, and 777828, and interchanges with Sierra 18-3368, Mallory 9-45208, GLM 89780, and others.

Installs in the lower unit of the outboard motor.
Made from durable, marine-grade CR Neoprene rubber for longevity.
Includes the impeller, drive keys, o-ring, seal, and gasket for a comprehensive service.

Part Number Matrix

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

Brand	Part Number
Johnson/Evinrude	396809 / 0396809
Johnson/Evinrude	777214 / 0777214
Johnson/Evinrude	777828 / 0777828
Sierra Marine	18-3368
Mallory	9-45208
GLM	89780
SEI	96-365-03BE
CEF	500346
Red Rhino	JE-206

Engine & Model Compatibility

Confirm your engine model/year in the table below.

This impeller kit is designed for select Johnson 2-stroke outboards from 40 HP to 55 HP, primarily covering 1986–1989 models.

This impeller kit is designed for select Evinrude 2-stroke outboards from 40 HP to 55 HP, primarily covering 1986–1989 models.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.
Johnson	J40WRLSIR	40	2-Stroke	1986–1988	396809
Johnson	J40WRSIR	40	2-Stroke	1986–1988	396809
Johnson	J40WRYSIR	40	2-Stroke	1986–1988	396809
Johnson	J45 Commercial	45	2-Stroke	1986–1988	396809
Johnson	J48	48	2-Stroke	1987–1988	396809
Johnson	J50	50	2-Stroke	1986–1988	396809
Johnson	J55 Commercial	55	2-Stroke	1986–1988	396809
Johnson	J55	55	2-Stroke	1989	396809
Evinrude	E40WRLSIR	40	2-Stroke	1986–1988	396809
Evinrude	E40WRSIR	40	2-Stroke	1986–1988	396809
Evinrude	E40WRYSIR	40	2-Stroke	1986–1988	396809
Evinrude	E45	45	2-Stroke	1989	396809
Evinrude	E55WRLSIR	55	2-Stroke	1986–1988	396809
Evinrude	E55WRSIR	55	2-Stroke	1986–1988	396809
Evinrude	E55WRYSIR	55	2-Stroke	1986–1988	396809

Technical Specs

Product Type: Water Pump Impeller Service Kit
Installation: Lower Unit Replacement
Dimensions: Impeller Diameter: 70 mm (2.76 inches), Hub Shaft Diameter: 16 mm (0.63 inch), Impeller Height: 22.3 mm (0.88 inch)
Weight: 60 g (2.1 oz)
Fitting Type: Drive Shaft Key Mounting
Other Technical Attributes: 6 Blades, Made of Marine Grade CR Neoprene Rubber

What’s in the Box

1 x Water Pump Impeller (396809/777214/777828)
2 x Impeller Drive Shaft Key (one black, one white)
1 x O-Ring (339543/303059)
1 x Seal (315788)
1 x Gasket (336530)

Installation Notes

Disconnect the battery and shift the outboard into neutral.
Remove the lower unit (gearcase) by unbolting it from the engine's midsection. Be prepared for it to be heavy.
Place the lower unit on a workbench. Locate and remove the bolts securing the water pump housing.
Lift the housing to expose the old impeller. You may need to gently pry it up.
Remove the old impeller, gasket, and wear plate. Note the orientation of the impeller blades as you remove it.
Clean the housing and mating surfaces thoroughly, removing any old gasket material or debris.
Install the new gasket, wear plate, and drive key onto the driveshaft.
Slide the new impeller onto the driveshaft, turning the shaft clockwise to bend the blades in the correct direction as you push it into the housing.
Apply a light coat of marine grease or soap to the inside of the pump cup and install it over the impeller.
Re-install the water pump housing bolts and torque them to the manufacturer's specification.
Re-install the lower unit, ensuring the driveshaft, shift shaft, and water tube align correctly.
Once assembled, test the engine using a water supply (flushing muffs) to confirm proper water flow from the tell-tale outlet.

Troubleshooting & FAQ

How do I know if this impeller kit will fit my specific motor?

The best way to confirm fitment is to check the tables in the "Engine & Model Compatibility" section. This kit primarily fits Johnson/Evinrude 40-55 HP 2-stroke outboards from 1986–1989. For full confidence, match your engine's model number and year against the list, or match your existing part number to one in our Part Number Matrix.

What are the signs of a failing water pump impeller?

Common signs include a weak or non-existent water stream from the "tell-tale" outlet, engine overheating alarms, steam from the exhaust, or a melted/deformed water pump housing. A brittle, cracked, or worn impeller can no longer pump water effectively and should be replaced immediately.

How often should I replace my outboard's impeller?

As a general maintenance rule, it is recommended to replace your water pump impeller every 1-2 years or every 100-200 hours of operation, whichever comes first. For boats used in saltwater or sandy/silty conditions, annual replacement is strongly advised to prevent premature failure.

What is the difference between the black and white drive keys included in the kit?

The kit includes two drive keys to accommodate slight variations in driveshaft keyway designs across different models and years. Both keys perform the same function of locking the impeller to the driveshaft. Compare them to your original key and use the one that provides the most secure fit.

My engine model is not listed but the horsepower and year seem to match. Will it fit?

While the kit may fit other models, we can only guarantee compatibility for the specific engine models listed. Different sub-models can have unique lower unit designs. We recommend checking your OEM part number against our Part Number Matrix or consulting a service manual to be certain.

Is this kit a complete water pump rebuild kit?

This is a comprehensive impeller service kit that includes the impeller and the necessary seals, gaskets, and keys for a standard replacement. It does not include the water pump housing, base, or wear plate. If your housing is scored, warped, or melted, it should be replaced separately.

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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