Water Pump Impeller – Fits Johnson/Evinrude 8–15 HP Outboard Motors (Replaces 386084, 0386084, 0777817)

Water Pump Impeller – Fits Johnson/Evinrude 8–15 HP Outboard Motors (Replaces 386084, 0386084, 0777817)

This water pump impeller is a direct-fit replacement for a wide range of Johnson and Evinrude outboard motors from 8 HP to 15 HP. It is the critical rotating component within the water pump assembly, responsible for drawing in and circulating cooling water through the engine to prevent overheating.

This impeller is designed for Johnson/Evinrude 2-Stroke (9.9–15 HP, 1974–2006) and 4-Stroke (8–15 HP, 1995–2004) models. It directly replaces OEM part numbers 386084, 0386084, and 0777817.

• Installation Method: Installs directly into the water pump housing with a press fit on the drive shaft.
• Durable Materials: Features a robust brass hub bonded to flexible neoprene rubber blades for reliable performance and longevity.
• Package Contents: Includes one water pump impeller. Note: Some kits from specific sellers may include an O-ring and drive key; please verify package contents before purchase.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

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.

Technical Specifications

Package Contents

Package contents may vary between different aftermarket brands. A standard package includes:

• 1 x Water Pump Impeller (Replaces 386084/0386084)

Note: Some brands, like QuickMarine, may include additional components. Verify the contents of your specific purchase. These optional items are:

• 1 x Drive Shaft Key Pin (0300611)
• 1 x O-ring (0319085)
• 1 x O-ring (0303067)

Installation Guide

1. Safety First: Disconnect the battery and ensure the engine cannot start accidentally. Turn off the fuel supply.
2. Access the Lower Unit: Remove the bolts securing the lower unit (gearcase) to the upper engine housing.
3. Remove the Water Pump Housing: Once the lower unit is detached, locate and unbolt the water pump housing to expose the impeller.
4. Inspect Components: Examine the wear plate and inside of the housing for grooves, warping, or scoring. Replace them if significant wear is present.
5. Remove Old Impeller: Slide the old impeller off the drive shaft. You may need to remove a drive key first. Note the rotational direction of the blades.
6. Prepare for Installation: Clean the drive shaft and the interior of the housing. Lightly lubricate the shaft with marine-grade grease.
7. Install New Impeller: Insert the drive key (if used) and slide the new impeller onto the shaft. Gently twist the impeller in the direction of engine rotation to correctly orient the blades inside the housing.
8. Reassemble the Housing: Securely reinstall the water pump housing, ensuring any seals or O-rings are correctly seated. Tighten bolts to the specified torque.
9. Reattach Lower Unit: Align the drive shaft and shift shaft, then reattach the lower unit to the engine.
10. Final Checks: Reconnect the battery and fuel line. Start the engine in a water source (using a flusher or in the water) and confirm a steady stream of water is exiting the tell-tale port.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my engine?
A: The most reliable method is to match your engine's model and year against the compatibility chart above. Additionally, compare your existing OEM part number to those listed in our Part Number Cross-Reference table.

Q: What are the common signs of a failing water pump impeller?
A: Key indicators include the engine running hotter than normal, an engine overheating alarm, or a weak or non-existent water stream from the "tell-tale" outlet port on the outboard.

Q: How often should I replace the water pump impeller?
A: For preventative maintenance, it is highly recommended to replace the impeller every 100 operating hours or at least once a year, whichever comes first, especially if you operate in saltwater or sandy/silty conditions.

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 ISO9001-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.