Water Pump Impeller Kit – Fits Yamaha 9.9HP 15HP 2-Stroke (Replaces 682-44352-00, Sierra 18-3074)

Water Pump Impeller Kit – Fits Yamaha 9.9HP 15HP 2-Stroke (Replaces 682-44352-00, Sierra 18-3074)

This water pump impeller repair kit is designed for Yamaha 2-Stroke 9.9HP and 15HP outboard motors, including E9.9D and E15D models. It provides a reliable solution for maintaining your engine’s cooling system.

This kit is a direct replacement for multiple OEM and aftermarket part numbers, ensuring wide compatibility for the specified engines.

• Includes a neoprene impeller, stainless steel hardware, gaskets, and plate for a complete service.
• Engineered as a direct replacement for a straightforward installation.
• Installation Note: Lubricate the new impeller with silicone grease, glycerin, or dish soap to prevent damage during startup.

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 Yamaha owners, here’s a guide to help you identify your engine’s serial/model: Yamaha Serial Number Guide. You can also review exploded diagrams to verify part numbers: Yamaha Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• 1 x Impeller (Replaces 682-44352-00)
• 1 x Damper Water Seal (Replaces 682-44365-00)
• 2 x Gasket (Replaces 682-44315-00)
• 1 x Outer Plate (Replaces 682-44323-00)
• 1 x Key (Replaces 90280-03024)

Installation Guide

1. Safety First: Disconnect the battery and disable the ignition system before beginning work.
2. Access the Lower Unit: Remove the bolts securing the lower unit (gearcase) to the engine's midsection and carefully lower it.
3. Remove the Water Pump Housing: Locate the water pump assembly on top of the gearcase. Remove the bolts to lift the housing cover.
4. Inspect and Remove Old Components: Take note of the order of components. Remove the old impeller, gaskets, wear plate, and seals. Clean any debris or corrosion from the housing and mating surfaces.
5. Install New Gaskets and Plate: Place the new gasket and outer wear plate into position.
6. Install the Impeller: Liberally lubricate the inside of the pump housing and the new impeller with silicone grease, glycerin, or dish soap. Slide the new woodruff key onto the driveshaft flat spot.
7. Seat the Impeller: Align the impeller with the key and slide it down the driveshaft. Turn the driveshaft clockwise while pushing down on the pump housing to seat the impeller blades correctly.
8. Reassemble and Test: Secure the housing with its bolts, tightening them to the manufacturer's specified torque. Re-install the lower unit, ensuring the shift shaft and driveshaft align correctly. Once assembled, start the engine in water and confirm a steady stream of water is exiting the tell-tale port.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my Yamaha engine?

A: This kit fits specific Yamaha 9.9HP and 15HP 2-Stroke models (E9.9D, E15D). The best way to confirm fitment is to match your existing part number to the ones listed in our "Part Number Cross-Reference" table. You can also consult your engine’s service manual or use the Yamaha Parts Diagrams linked above.

Q: What are the signs of a failing water pump impeller?

A: Common signs include a weak or intermittent water stream from the engine's tell-tale port, engine overheating alarms, or a visible reduction in cooling water output. Impellers can become brittle, cracked, or worn over time, reducing their pumping efficiency.

Q: What lubricant should I use when installing the new impeller?

A: Always lubricate the impeller and the inside of the pump housing to prevent damage during the first dry start. Use silicone grease, glycerin, or simple dish soap. Do not use petroleum-based lubricants, which can damage the neoprene rubber.

Q: How often should I replace my water pump impeller?

A: For preventative maintenance, it is recommended to inspect the impeller annually and replace it every 1-2 years, or after every 100-200 hours of use, depending on operating conditions (e.g., saltwater vs. freshwater).

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.