Water Pump Impeller Kit – Fits Johnson/Evinrude 25–50 HP Outboards (Replaces 432941, 766433, 777825)

Water Pump Impeller Kit – Fits Johnson/Evinrude 25–50 HP Outboards (Replaces 432941, 766433, 777825)

This water pump impeller kit is designed for Johnson/Evinrude 25–50 HP, 2-Stroke outboard motors from 1989–1998. It is a direct fit for specific models including 35 HP Jet (1992–1993), 40 HP (1989–1998), 48 HP (1989–1996), and 50 HP (1989–1998).

This kit serves as a direct replacement for Johnson/Evinrude part numbers 432941 / 0432941, 765350 / 0765350, 437059 / 0437059, 766433 / 0766435, 777825 / 0777825 and Sierra part number 18-3104.

• Installs in the lower unit/gear case to restore cooling system performance.
• The impeller is constructed from marine-grade CR Neoprene rubber with a hardened nylon hub for durability.
• Kit includes the essential impeller, drive key, and gasket for a standard service.

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 × Rubber Impeller
• 1 × Drive Shaft Key
• 1 × Gasket

Installation Guide

Always consult your service manual before beginning work. The general process is as follows:

1. Disconnect Power: Disconnect the negative battery cable and ensure the outboard is in the neutral position.
2. Remove Lower Unit: Unbolt and carefully lower the gear case (lower unit) from the outboard's driveshaft housing. Be prepared for it to be heavy.
3. Access Pump Housing: Locate the water pump assembly on top of the gear case. Remove the bolts securing the water pump housing cover.
4. Remove Old Impeller: Lift off the housing. You may need to gently pry it. Note the orientation of any seals. Slide the old impeller off the drive shaft and remove the small, rectangular drive key from the shaft.
5. Clean and Inspect: Thoroughly clean the inside of the housing and the base plate. Inspect the housing, cover, and plate for scoring, warping, or corrosion. Replace them if significant wear is found.
6. Install New Impeller: Insert the new drive key into the slot on the drive shaft. Slide the new impeller onto the shaft, turning the shaft clockwise to gently bend the blades into position inside the housing.
7. Reassemble: Install the new gasket. Reinstall the pump housing cover and tighten the bolts to the manufacturer's specified torque in a crisscross pattern.
8. Reinstall Lower Unit: Carefully guide the lower unit back into place, ensuring the drive shaft, shift shaft, and water tube align correctly. Secure it with the mounting bolts.
9. Test Operation: Reconnect the battery. Start the engine in a test tank or in the water and confirm a strong, steady stream of water is exiting the tell-tale port.

Troubleshooting & FAQ

Q: How do I confirm this impeller kit fits my engine?
A: First, check the "Compatible Engine Models" table to see if your motor's horsepower and year range are listed. This kit fits specific Johnson/Evinrude 25-50 HP 2-stroke outboards (1989–1998). For best results, cross-reference your existing part number with those in our list, such as 432941, 766433, or 777825. You can use the Johnson/Evinrude serial number guide linked above to find your model details.

Q: What are the signs of a failing water pump impeller?
A: The most common sign is a weak or no water stream from the engine's "tell-tale" outlet. Other indicators include the engine overheating alarm sounding, steam from the exhaust, or the engine going into a power-reduction mode. A failed impeller can quickly lead to severe engine damage.

Q: How often should I replace my impeller?
A: As a critical part of preventative maintenance, it is recommended to replace the impeller every 1-2 years or after 100-200 hours of use, whichever comes first. The rubber can degrade and become brittle over time, even with low hours.

Q: Is this a complete water pump rebuild kit?
A: No, this is an impeller service kit that includes the core components: the impeller, drive key, and gasket. It does not include the full housing, wear plate, or all O-rings that might be part of a complete rebuild kit. Please verify the package contents against your needs.

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.