Impeller with Key for Yamaha DT8 DT9.9 | JLM Marine

Replacement Outboard Rubber Impeller with Key / Pin for Yamaha DT8 DT9.9

This aftermarket rubber impeller with key/pin is designed to fit Yamaha 2-Stroke DT8 and DT9.9 outboard engines manufactured from 1988 to 1997. Engineered to meet OEM specifications, this impeller ensures reliable water pump performance and proper cooling for your engine.

A direct replacement for Yamaha OEM impellers, this kit provides a cost-effective solution for routine maintenance or emergency repairs on your DT-series outboard.

• Includes complete impeller assembly with drive key/pin for immediate installation
• Compatible with both DT8 and DT9.9 2-stroke models (1988–1997)
• Manufactured to OEM specifications for reliable cooling performance

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 × Outboard Rubber Impeller with Key / Pin

Installation Guide

1. Disconnect the fuel line and remove the lower unit from the outboard motor according to your service manual.
2. Locate and remove the water pump housing cover, typically secured by bolts or screws.
3. Carefully extract the old impeller from the pump housing, noting its orientation and the position of the drive key/pin.
4. Inspect the pump housing and plate for wear, cracks, or corrosion; clean thoroughly before proceeding.
5. Lubricate the new impeller blades with glycerin, water pump grease, or soapy water to ease installation.
6. Insert the drive key/pin into the impeller hub slot, ensuring it is seated securely.
7. Align the impeller blades in the correct rotation direction (usually clockwise when viewed from the top) and gently slide the impeller into the housing.
8. Reinstall the pump housing cover, ensuring all gaskets or O-rings are properly seated.
9. Reattach the lower unit to the outboard, tightening all fasteners to the manufacturer's specified torque.
10. Reconnect the fuel line and perform a water test to confirm proper water flow from the telltale outlet.
11. Check for leaks around the pump housing and lower unit seals during the test run.
12. If water flow is weak or absent, recheck impeller installation and housing seal integrity.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my Yamaha DT8 or DT9.9?
A: Verify that your engine is a 2-stroke DT8 or DT9.9 model manufactured between 1988 and 1997. Cross-reference your engine's serial number using the Yamaha serial number guide linked above, or consult your outboard's parts diagram to confirm the impeller part number.

Q: How often should I replace the impeller?
A: Yamaha recommends inspecting the impeller annually and replacing it every 2–3 years or 200–300 hours of operation, whichever comes first. Replace immediately if you notice cracked, missing, or worn blades.

Q: What are the signs of a failing impeller?
A: Common symptoms include weak or no water flow from the telltale (pee hole), engine overheating, steam from the powerhead, or an alarm indicating high temperature. If you experience any of these, shut down the engine immediately and inspect the impeller.

Q: Can I install this impeller myself, or do I need a mechanic?
A: If you have basic mechanical skills and the proper tools, you can replace the impeller yourself by following the installation guide and your engine's service manual. However, professional installation is recommended if you are unfamiliar with lower unit disassembly.

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.