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Description
Water Pump Impeller Kit – Fits Johnson/Evinrude 4-8 HP (Replaces 396644, 0396644, 18-4529)Water Pump Impeller Kit Fits Johnson Evinrude 4 8 HP (Replaces 396644, 18 4529) This water pump impeller kit is designed for Johnson Evinrude 4 8 HP 2 Stroke outboards (1980 2005) and 5 6 HP 4 Stroke (128cc) outboards (1998 2004). It provides a direct fit replacement solution for your original water pump components, ensuring reliable engine cooling. This kit serves as a direct replacement for Johnson Evinrude part numbers 396644 0396644, Sierra 18
Water Pump Impeller Kit – Fits Johnson/Evinrude 4-8 HP (Replaces 396644, 18-4529)
This water pump impeller kit is designed for Johnson/Evinrude 4-8 HP 2-Stroke outboards (1980-2005) and 5-6 HP 4-Stroke (128cc) outboards (1998-2004). It provides a direct-fit replacement solution for your original water pump components, ensuring reliable engine cooling.
This kit serves as a direct replacement for Johnson/Evinrude part numbers 396644 / 0396644, Sierra 18-4529, and GLM 12255.
- Engineered with marine-grade materials for durability in freshwater and saltwater environments.
- Includes all necessary gaskets, seals, and hardware for a complete rebuild of the impeller assembly.
- Designed for a direct fit into the original water pump housing, simplifying installation.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Johnson/Evinrude | 396644 / 0396644 |
| Sierra | 18-4529 |
| GLM | 12255 |
Compatible Engine Models
Confirm your engine model/year in the table below. For Johnson/Evinrude owners, here’s a guide to help you identify your engine’s serial/model: Johnson/Evinrude Serial Number Guide.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Johnson/Evinrude | Various | 4 | 2-Stroke | 1986-1992 | 396644 | |
| Johnson/Evinrude | Various | 4.5 | 2-Stroke | 1980-1984 | 396644 | |
| Johnson/Evinrude | 4 Deluxe | 4 | 2-Stroke | 1985-1988 | 396644 | |
| Johnson/Evinrude | Various | 5 | 2-Stroke | 1980-1983, 1996-2001 | 396644 | |
| Johnson/Evinrude | Various | 5 | 4-Stroke (128cc) | 1998-2004 | 396644 | |
| Johnson/Evinrude | Various | 6 | 2-Stroke | 1980-1985 | 396644 | |
| Johnson/Evinrude | Various | 6 | 2-Stroke | 1984-2001, 2003-2005 | 396644 | |
| Johnson/Evinrude | Various | 6 | 4-Stroke (128cc) | 1998-2004 | 396644 | |
| Johnson/Evinrude | Various | 7.5 | 2-Stroke | 1980-1985 | 396644 | |
| Johnson/Evinrude | Various | 8 | 2-Stroke | 1980-2001, 2003-2005 | 396644 |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Water Pump Impeller Kit (without housing) |
| Installation | Direct fit to original housing |
| Other Technical Attributes | Marine Grade Materials |
| Fitting Type | Vehicle Specific Fit |
| Dimensions | 4.29 × 3.82 × 2.24 inches (109 × 97 × 57 mm) (package dimensions) |
| Weight | 6.2 ounces (176 g) |
| Warranty | Amazon Voluntary 30-Day Return |
Package Contents
- 1 x Impeller (389576)
- 1 x Pin/Drive Key (300611)
- 1 x Pump Cup/Impeller Housing Cup (324641)
- 1 x Wear Plate (324640)
- 2 x Gaskets (325040)
- 1 x O-Ring (303191)
- 2 x Grommets (302497, 321129)
- 4 x Screws (324430)
Installation Guide
- Safety First: Disconnect the battery and spark plug wires before beginning any work.
- Access the Lower Unit: Drain the gearcase lubricant. Unbolt and remove the lower unit (gearcase) from the outboard's driveshaft housing.
- Disassemble the Water Pump: Locate the water pump housing on top of the gearcase. Remove the bolts securing the housing to access the impeller.
- Inspect and Remove Old Parts: Take note of the orientation of all parts. Remove the old impeller, gaskets, wear plate, and seals. Clean all mating surfaces thoroughly.
- Install New Components: Lightly grease the new wear plate and pump cup. Install the new drive key and slide the new impeller onto the driveshaft, rotating it in the direction of engine operation.
- Reassemble and Test: Install the new gaskets and re-secure the housing. Re-install the lower unit, refill the gearcase lubricant, and reconnect the battery/spark plugs. Test the engine using a water source (flushing muffs) to confirm a strong water stream from the tell-tale outlet.
Troubleshooting & FAQ
Q: How do I confirm this fits my engine?
A: The best way is to check the part number on your original component and compare it to the numbers in our "Part Number Cross-Reference" table. You should also verify your engine's make, model, and year against our "Compatible Engine Models" list.
Q: Does this kit include the entire water pump housing?
A: No, this is a water pump impeller kit and does not include the main plastic or metal housing. It is designed to rebuild the wearable components inside your existing housing.
Q: What are the signs of a failing impeller?
A: Common signs include the engine overheating at idle or low speeds, and a weak or non-existent water stream from the "tell-tale" outlet on your outboard.
Q: How often should I replace my water pump impeller?
A: As a general maintenance rule, it is recommended to inspect and likely replace your impeller every 1 to 2 years, or every 100-200 hours of use, to prevent engine damage from overheating. This interval can be shorter if you frequently operate in sandy or silty water.
Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.
Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.
Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.
Important Notes
- Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
- This product is an aftermarket replacement part and is not an OEM component.
- Professional installation is recommended to ensure safety and optimal performance.
Why Choose JLM MARINE?
- Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
- Fast Global Shipping: Free delivery worldwide in 5–15 days.
- Direct from Manufacturer: Competitive pricing without compromising quality.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy