Water Pump Kit – Fits Johnson/Evinrude 2-Cylinder & 3-Cylinder Outboards (Replaces 389133)
Water Pump Kit – Fits Johnson/Evinrude 2-Cylinder & 3-Cylinder Outboards (Replaces 389133) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Water Pump Kit – Fits Johnson/Evinrude 2-Cylinder & 3-Cylinder ...
Product Details
This complete Water Pump Kit – Fits Johnson/Evinrude 2-Cylinder & 3-Cylinder Outboards (Replaces 389133) is engineered for Johnson/Evinrude 50–55 HP 2-Cylinder & 3-Cylinder loop-charged engines with a small gearcase, manufactured between 1971–1978.
It serves as a direct replacement for Johnson/Evinrude 389133, BRP 387326, Sierra 18-3325, and GLM 12232.
- Designed for direct OEM-replacement installation.
- The kit includes a complete pump assembly with housing for a comprehensive service.
- Specifically intended for small gearcase applications on loop-charged engines.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Johnson/Evinrude | 389133 |
| BRP | 387326 |
| Sierra | 18-3325 |
| GLM | 12232 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Johnson/Evinrude owners, this kit fits specific 50 HP and 55 HP loop-charged models from 1971 to 1978 with the smaller gearcase. Please verify your OEM part number.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Johnson/Evinrude | 2-Cylinder & 3-Cylinder | 50, 55 | 2-Stroke | 1971–1978 | 389133 | Loop-charged engines with small gearcase |
Technical Specs
- Product Type
- Complete Water Pump Kit
- Installation
- Direct OEM replacement
- Dimensions
- 11.0" x 11.0" x 11.0"
- Impeller Key Type
- Half-moon key style
- Application Type
- Small gearcase with loop-charged engines
- Other Technical Attributes
- Kit includes complete pump assembly with housing
What’s in the Box
- 1 x Complete Water Pump Kit (389133/387326)
- Impeller
- Wear Plate
- O-rings
- Housing
- Gaskets
- Mounting hardware
- Water tube grommets
Installation Notes
- Disconnect the battery and ignition system for safety before starting any work.
- Remove the lower unit (gearcase) from the outboard by unbolting it from the engine leg.
- Unbolt and carefully remove the old water pump housing and impeller assembly.
- Thoroughly clean the mating surfaces, removing any old gasket material or sealant.
- Install the new wear plate, gasket, and half-moon impeller key onto the driveshaft.
- Slide the new impeller onto the shaft, ensuring it seats correctly over the key.
- Lubricate the inside of the new housing and install it over the impeller, turning the driveshaft to seat the vanes.
- Secure the new housing with the provided hardware and tighten to the manufacturer's torque specifications.
- Reinstall the lower unit, ensuring the water tube and shift shaft are correctly aligned.
- Once reassembled, start the engine in water and verify a steady stream of water from the "telltale" outlet.
Troubleshooting & FAQ
How do I confirm this kit fits my specific engine?
This kit is designed for Johnson/Evinrude 50–55 HP 2- and 3-cylinder loop-charged engines from 1971–1978 that use a small gearcase. The most reliable way to confirm fitment is to match your existing part number to one of the direct replacements listed: 389133, 387326, 18-3325, or 12232.
What are the signs of a failing water pump impeller?
Common symptoms include a weak or non-existent water stream from the "telltale" outlet, engine overheating alarms, or a noticeable reduction in engine performance. Visible signs on the old impeller include cracked, brittle, or missing vanes.
How often should I replace my water pump kit?
As a general maintenance guideline, it is recommended to inspect the impeller annually and replace the entire water pump kit every 2-3 years or every 200-300 hours of use, whichever comes first. This interval can be shorter if you operate frequently in sandy or silty water.
Is the pump housing included in this kit?
Yes, this is a complete kit that includes the water pump housing, impeller, wear plate, gaskets, and all necessary hardware for a full replacement.
What's the difference between this and an original OEM kit?
This kit is an aftermarket part designed to meet or exceed OEM specifications for fit, form, and function. It offers a cost-effective solution without compromising on quality or performance, using comparable materials and manufacturing processes.
Is this a difficult part to install myself?
Installation requires basic mechanical knowledge and tools. While many boat owners perform this maintenance themselves, it involves removing the lower unit. If you are not comfortable with this procedure, professional installation is recommended to ensure proper function and avoid damage.
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.
Payment & Security
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