Water Pump Impeller Repair Kit – Fits Johnson/Evinrude 25-35 HP (Replaces 389611/0389611)

$49.50

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Water Pump Impeller Repair Kit – Fits Johnson/Evinrude 25-35 HP (Replaces 389611/0389611) is backordered and will ship as soon as it is back in stock.

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Product Details

This Water Pump Impeller Repair Kit – Fits Johnson/Evinrude 25-35 HP (Replaces 389611/0389611) provides a complete solution for servicing the water pump on Johnson/Evinrude 2-Stroke outboards, covering 25 HP models from 1977–1983 and 35 HP models from 1976–1980.

It serves as a direct replacement for Johnson/Evinrude part numbers 389611/0389611 and interchanges with Sierra components 18-3363 (Housing), 18-3358 (Pump), 18-3360 (Gasket), 18-3329 (Grommet), and 18-3133 (Bolts).

Installs in the engine's lower unit for a direct OEM fit.
Features a durable, saltwater-resistant neoprene impeller.
Includes essential gaskets, hardware, and housing for a complete rebuild.

Part Number Matrix

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

Brand	Part Number	Notes
Johnson/Evinrude	389611 / 0389611	OEM Kit Number
Sierra	18-3363	Housing only
Sierra	18-3358	Pump only
Sierra	18-3360	Gasket only
Sierra	18-3329	Grommet only
Sierra	18-3133	Bolts only

Engine & Model Compatibility

Confirm your engine model/year in the table below.

For Johnson/Evinrude owners, please verify your engine's horsepower and year falls within the specified range to ensure correct fitment.

Brand	Rated HP	Stroke	Years	OEM Part No.
Johnson/Evinrude	25 HP	2-Stroke	1977–1983	389611/0389611
Johnson/Evinrude	35 HP	2-Stroke	1976–1980	389611/0389611

Technical Specs

Product Type: Water Pump Repair/Rebuild Kit
Installation Location: Engine Lower Unit
Housing Material: Composite
Impeller Material: Saltwater-resistant neoprene
Connection: Direct OEM Fit

What’s in the Box

1 x Impeller with Pin
1 x Housing (Replaces 330560 / Sierra 18-3363)
1 x Pump (Replaces 328751 / Sierra 18-3358)
1 x Gasket (Replaces 329390 / Sierra 18-3360)
1 x Grommet (Replaces 302497 / Sierra 18-3329)
4 x Bolts (Replaces 331979 / Sierra 18-3133)

Installation Notes

Disconnect the battery and secure the ignition system to prevent accidental starting.
Drain the gearcase lubricant from the lower unit.
Remove the lower unit (gearcase) assembly from the outboard's exhaust housing.
Unbolt and carefully remove the old water pump housing, noting the position of all parts.
Thoroughly clean the driveshaft and mating surfaces of any old gasket material or debris.
Install the new grommet, gasket, and pump components as provided in the kit.
Slide the new impeller onto the driveshaft, ensuring the key is correctly aligned and seated.
Install the new housing and tighten the bolts in a crisscross pattern to the manufacturer-specified torque.
Reinstall the lower unit, ensuring the water tube and shift shaft are properly aligned and engaged.
Refill the gearcase with fresh, appropriate-grade marine lubricant before operation.
Start the engine in a suitable water source and verify a strong, steady stream of water from the tell-tale outlet.

Troubleshooting & FAQ

How do I know if this kit fits my specific engine model?

This kit is designed for Johnson/Evinrude 2-Stroke outboards: 25 HP (1977–1983) and 35 HP (1976–1980). Always cross-reference your engine's OEM part number with 389611 or 0389611 to ensure an exact match.

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, or a noticeable decrease in engine performance. A dry-rotted or damaged impeller cannot effectively cool the engine.

How often should the water pump impeller be replaced?

As a general maintenance rule, it's recommended to inspect and/or replace the impeller every 1-2 years or every 100-200 hours of operation. Service intervals should be shorter if operating frequently in saltwater, sandy, or silty conditions.

Is the composite housing as durable as a metal one?

Yes, the high-strength composite housing is specifically engineered for durability and corrosion resistance in harsh marine environments. It is designed to meet or exceed OEM specifications for performance and longevity.

What is the difference between OEM and aftermarket parts?

This listing is for an aftermarket replacement, not an original equipment manufacturer (OEM) part. It is built to the same specifications with comparable or superior materials. Our parts are manufactured in an ISO 9002 certified facility and undergo batch-inspections for quality and consistency.

How fast is shipping and what does it cost?

We ship worldwide quickly, with typical transit times of 5–15 days for most regions. Standard shipping is free for most orders. Expedited options, where available, will be presented at checkout.

What is your warranty and return policy?

This product is covered by a 1-year warranty against manufacturing defects under normal marine use. If you encounter any issues, please contact our support team with your order details for assistance. Returns are accepted within our standard window for unused items in their original condition. See our policy page or reach out for instructions.

Safety & Important Info

Verify images and specifications against your original part before purchase. If anything differs—even if your model appears compatible—do not install.
This is an aftermarket replacement part, not an OEM component. Brand names and part numbers are used for reference purposes only.
Professional installation is strongly recommended for safety and to ensure optimal performance. Incorrect installation can lead to engine damage.

About Sea Sierra

Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world saltwater and freshwater conditions.
Fast Global Fulfillment — With partners worldwide, we offer free standard delivery to most regions in 5–15 days and provide transparent tracking.
Manufacturer-Direct Value — By working directly with manufacturers, we deliver fair pricing without compromising on materials, quality control, or durability.

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