Water Pump Impeller Kit – Fits Johnson/Evinrude 20–35 HP (Replaces 393630, 0393630)

Water Pump Impeller Kit – Fits Johnson/Evinrude 20–35 HP (Replaces 393630, 0393630)

This water pump impeller kit is a direct replacement for Johnson/Evinrude 20–35 HP, 2-stroke outboard motors from 1980–2005. It provides all necessary components for a complete rebuild of the water pump assembly, ensuring your engine maintains proper cooling and performance.

This kit is a direct replacement for Johnson/Evinrude OEM part numbers 393630 and 0393630, as well as several aftermarket equivalents.

• Engineered as a direct OEM replacement for straightforward installation.
• Includes a durable 6-blade neoprene impeller and a metal/aluminum housing for reliable, long-lasting performance.
• Comes as a complete kit with all required gaskets, O-rings, and hardware.

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

• 1 x Neoprene Impeller (395289)
• 1 x Impeller Key (330619)
• 1 x Gasket (325537)
• 1 x Wear Plate (328755)
• 1 x Pump Cup (328751)
• 1 x Pump Housing (393632)
• 1 x Grommet (302497)
• 1 x Brass Bushing (328754)
• 4 x O-ring (311338 x 2 / For Bushing 301877 / 554545)
• 1 x Seal (328753)
• 6 x Bolt with Washer (324960 / 318452)

Installation Guide

1. Safety First: Disconnect the battery and ensure the engine is securely mounted.
2. Drain Gear Lube: Place a drain pan under the lower unit and remove the drain/fill plugs to drain the gear lube.
3. Remove Lower Unit: Unbolt the lower unit (gearcase) from the outboard's leg. You may need to disconnect the shift linkage.
4. Disassemble Pump: Carefully remove the bolts holding the water pump housing in place and lift it off the driveshaft.
5. Inspect Old Parts: Note the rotational direction of the old impeller's blades. Remove the old impeller, wear plate, key, and gaskets.
6. Clean Surfaces: Thoroughly clean the mounting surfaces on the gearcase and the driveshaft, removing any old gasket material or debris.
7. Install New Components: Lightly grease the new seals and O-rings. Install the new wear plate and gaskets.
8. Install Impeller: Slide the impeller key onto the driveshaft and then slide the new impeller on, twisting it in the correct rotational direction to seat the blades.
9. Reassemble Pump: Place the new pump cup and housing over the impeller and fasten securely with the new bolts, tightening to manufacturer torque specs.
10. Reinstall Lower Unit: Guide the lower unit back into place, ensuring the driveshaft and water tube align correctly. Reconnect the shift linkage.
11. Refill Gear Lube: Fill the lower unit with fresh marine gear lubricant according to your owner's manual.
12. Test Operation: Reconnect the battery. Safely test the engine in water, verifying a strong, steady stream of water from the tell-tale outlet.

Troubleshooting & FAQ

Q: How do I confirm this fits my engine?
A: Check the "Compatible Engine Models" table and cross-reference your motor's model, HP, and year. Ensure the OEM part number 393630 matches your service manual's requirement. Verifying against the product images is also recommended.

Q: What are the signs of a failing water pump impeller?
A: Common signs include a weak or intermittent water stream from the "tell-tale" outlet, engine overheating alarms, and a visibly cracked, brittle, or worn impeller during inspection.

Q: How often should the impeller be replaced?
A: For optimal performance and to prevent engine damage, it is recommended to inspect the impeller annually and replace it every 1-2 years, or more frequently if operating 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 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.