Water Pump Impeller – Fits Johnson/Evinrude 40HP (Replaces 390286, 0390286, 777835, 0777835)

$15.89

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Water Pump Impeller – Fits Johnson/Evinrude 40HP (Replaces 390286, 0390286, 777835, 0777835) is backordered and will ship as soon as it is back in stock.

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Delivery and Shipping

Free standard shipping on all orders under 1 KG

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 aftermarket Water Pump Impeller is designed for reliable performance in Evinrude/Johnson Outboard 40HP 2-Stroke engines manufactured between 1983 and 1986. It serves as a direct-fit replacement, ensuring your engine's cooling system functions efficiently for optimal engine health and longevity.

It is a direct replacement for Johnson/Evinrude part numbers 390286, 0390286, 777835, and 0777835, and interchanges with Sierra 18-3366, CEF 500353, Mallory Marine 9-45212, and others.

Installs as a direct replacement component.
Constructed from durable neoprene rubber for a long service life.
Available as an impeller only or as a kit with the key pin included.

Part Number Matrix

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

Brand	Part Number
Johnson/Evinrude	390286 / 0390286
Johnson/Evinrude	777835 / 0777835
Sierra	18-3366
CEF	500353
Mallory Marine	9-45212
GLM	89990
SEI Marine	96-399-05E
Soxa Marine	17IO016 / 17IO016K

Engine & Model Compatibility

Confirm your engine model and year in the tables below.

This impeller is compatible with various 40 HP 2-Stroke Evinrude outboard models from the mid-1980s.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.
Evinrude	E40RSLR	40	2-Stroke	1983–1986	390286
Evinrude	E40RSR	40	2-Stroke	1983–1986	390286
Evinrude	E40RWCDB	40	2-Stroke	1983–1986	390286
Evinrude	E40RWCOM	40	2-Stroke	1983–1986	390286
Evinrude	E40RWCRA	40	2-Stroke	1983–1986	390286
Evinrude	E40RWLCDB	40	2-Stroke	1983–1986	390286
Evinrude	E40RWLCOM	40	2-Stroke	1983–1986	390286
Evinrude	E40RWLCRA	40	2-Stroke	1983–1986	390286
Evinrude	E40RWLCTR	40	2-Stroke	1983–1986	390286
Evinrude	E40RWLTR	40	2-Stroke	1983–1986	390286

This impeller is also compatible with various 40 HP 2-Stroke Johnson outboard models from the same period.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.
Johnson	J40RSLR	40	2-Stroke	1983–1986	390286
Johnson	J40RSR	40	2-Stroke	1983–1986	390286
Johnson	J40RWCDB	40	2-Stroke	1983–1986	390286
Johnson	J40RWCOM	40	2-Stroke	1983–1986	390286
Johnson	J40RWCRA	40	2-Stroke	1983–1986	390286
Johnson	J40RWCTR	40	2-Stroke	1983–1986	390286
Johnson	J40RWLCDB	40	2-Stroke	1983–1986	390286
Johnson	J40RWLCOM	40	2-Stroke	1983–1986	390286
Johnson	J40RWLCRA	40	2-Stroke	1983–1986	390286
Johnson	J40RWLCTR	40	2-Stroke	1983–1986	390286

Technical Specs

Product Type: Water Pump Impeller
Installation: Direct replacement
Material: Neoprene rubber
Number of Blades: 6
Hub/Shaft Size: 0.689 inch (17.5 mm)
Height/Thickness: 0.748 inch (19 mm)
External Diameter: 2.004 inch (50.9 mm)
Key/Pin Compatibility: 0305350, 0308928, 0777849, 308924, 308928
Other Technical Attributes: Some variants include the key pin (e.g., 17IO016K), while others are the impeller only (e.g., 17IO016).

What’s in the Box

Package contents vary based on the specific part number selected. Please verify before ordering.

Part numbers ending in "K" (e.g., Soxa Marine 17IO016K):
- 1 x Water Pump Impeller (replaces 390286)
- 1 x Impeller Key Pin
Part numbers without a "K" suffix (e.g., Soxa Marine 17IO016):
- 1 x Water Pump Impeller (replaces 390286)

Installation Notes

Disconnect the battery and remove the engine cover.
Shift the outboard into neutral.
Remove the lower unit (gearcase) by unbolting it from the engine's midsection.
Locate and unbolt the water pump housing cover.
Carefully remove the old impeller, noting the direction of the blades.
Clean the housing and inspect it for wear, cracks, or corrosion. Replace if damaged.
Install the new impeller with a slight clockwise rotation to bend the blades correctly. Ensure the key pin is properly seated.
Reassemble the water pump housing, ensuring a tight seal.
Reattach the lower unit to the midsection and secure all bolts.
Reconnect the battery, start the engine in water, and verify water is exiting the "telltale" outlet.

Troubleshooting & FAQ

How do I know if this impeller fits my specific engine?

This impeller fits Johnson and Evinrude 40HP 2-Stroke outboards from 1983–1986. Please check the "Engine & Model Compatibility" table on this page and cross-reference your engine's model number to confirm fitment before purchasing.

Does this impeller kit include the key pin?

It depends on the part number you purchase. Variants with a "K" suffix (like 17IO016K) include both the impeller and the key pin. Variants without the "K" (like 17IO016) include only the impeller. Please check the "What's in the Box" section for details.

What are the signs of a failing water pump impeller?

Common signs include a weak or non-existent stream of water from the "telltale" pilot outlet, engine overheating alarms, or a noticeable decrease in engine performance. Visible signs on the old impeller include cracked, brittle, or broken blades.

How often should I replace my impeller?

For preventative maintenance, it is recommended to inspect your impeller annually and replace it every 1-2 years, depending on usage (hours run) and water conditions (saltwater vs. freshwater). Never wait for it to fail completely, as that can lead to severe engine damage.

Is this a genuine OEM part?

No, this is an aftermarket replacement part, not an original equipment manufacturer (OEM) component. It has been engineered to meet or exceed OEM specifications for fit, form, and function.

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 and specifications against 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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